From patchwork Fri Sep 6 14:53:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11135459 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6DE611395 for ; Fri, 6 Sep 2019 14:53:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 39EF6206A5 for ; Fri, 6 Sep 2019 14:53:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Mag0NQ/B" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 39EF6206A5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3F17F6B0008; Fri, 6 Sep 2019 10:53:31 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 3C8156B000A; Fri, 6 Sep 2019 10:53:31 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2DE066B000C; Fri, 6 Sep 2019 10:53:31 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0023.hostedemail.com [216.40.44.23]) by kanga.kvack.org (Postfix) with ESMTP id 0BD3F6B0008 for ; Fri, 6 Sep 2019 10:53:31 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id ADD2B181AC9AE for ; Fri, 6 Sep 2019 14:53:30 +0000 (UTC) X-FDA: 75904789380.19.corn58_58ccd3e67e337 X-Spam-Summary: 2,0,0,28f5037ca4b378d9,d41d8cd98f00b204,alexander.duyck@gmail.com,:nitesh@redhat.com:kvm@vger.kernel.org:mst@redhat.com:david@redhat.com:dave.hansen@intel.com:linux-kernel@vger.kernel.org:willy@infradead.org:mhocko@kernel.org::akpm@linux-foundation.org:virtio-dev@lists.oasis-open.org:osalvador@suse.de:yang.zhang.wz@gmail.com:pagupta@redhat.com:riel@surriel.com:konrad.wilk@oracle.com:lcapitulino@redhat.com:wei.w.wang@intel.com:aarcange@redhat.com:pbonzini@redhat.com:dan.j.williams@intel.com:alexander.h.duyck@linux.intel.com,RULES_HIT:41:69:152:355:379:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1542:1593:1594:1711:1730:1747:1777:1792:2196:2199:2393:2559:2562:2693:2895:3138:3139:3140:3141:3142:3354:3865:3866:3867:3868:3870:3871:3872:3874:4250:4321:4385:5007:6261:6653:6737:7576:8660:9036:9413:10004:10400:11026:11473:11658:11914:12043:12048:12291:12296:12297:12438:12517:12519:12555:12679:12683:12760:12986:13148:13230:13869: 14096:14 X-HE-Tag: corn58_58ccd3e67e337 X-Filterd-Recvd-Size: 5632 Received: from mail-pl1-f194.google.com (mail-pl1-f194.google.com [209.85.214.194]) by imf38.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 14:53:30 +0000 (UTC) Received: by mail-pl1-f194.google.com with SMTP id t11so3283370plo.0 for ; Fri, 06 Sep 2019 07:53:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=y1UWMqHdCnekLv2dWzC/1NNH0fQiwzlC8Wszz/ILY4M=; b=Mag0NQ/BaY/evlZK7rDqVpVa4SoD20yegY2gnU1J5QJ3cQlPeV/WcjiNsMRjYj4UlO j47A4eB1Yyu6XTdDMn6pahVscdhXahzaiE5xjJhESZqtYaG0lzLUqBsiW6/Fy9NG09xg C0aLIvy/oDX59quZyauouhcpPyWzxdO81zIGT2WvnflPokAj/pLHMhQ3mj+xzsqp14Ls 7ab/Q7uvHBNht0vduEP9dnyrW2UuVdwFLJ4a6jdGsKR41YoqTUo9nnlYCGO6X4dQ9RcX uROSr2vodVMG9kRIlO3cfEccObq9fvrETCZcgM7na40pGHl+LKkghJ1Aria9vjVlnarm gZnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=y1UWMqHdCnekLv2dWzC/1NNH0fQiwzlC8Wszz/ILY4M=; b=Yscc8rHRYvmhP3oZQf0ttZVR/5xFf8fvGm0q+lsZ7W1j3s+axkNgBHkvdgzl08EKZ6 0kK/ggUQhfVos01qGKsO0Yee3Ir72PT3eSXdjffyeCWFbjSgh73ONtamGa+iqE2ft0BN gQGGjaYzz3YXvbJPMHSaiptxaA9g5g4yAphct+84ltE+c/ePj6E7KDI+JwI4xH+AZZ2C E4gX1s3sre185aoIqYMwunpVJPnYd9vvy/9r2yO8SpIdNsyukRxR2IPNtSDUZ7SllzwJ LloO0s0T8aYunhmwvWxvQcIfA1z4jkbQebeJwUtt+bOy3DuVN51rZkvGXzrXkT0nvq5G zkMA== X-Gm-Message-State: APjAAAXgrUz/UJwvrWbXrZn7/52nw9g3dO+f10B+LlmE9ee61xs4rUf7 GSPp4v61KrFXijoUZ4+yJdM= X-Google-Smtp-Source: APXvYqwXbA80G+oF/wmxkLk0iz+eT1kKPHeORFg6MaYksK5+TYFebrUDE34FVzIfkIJ4DDYs9NYZbQ== X-Received: by 2002:a17:902:a01:: with SMTP id 1mr9873072plo.278.1567781608953; Fri, 06 Sep 2019 07:53:28 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id c1sm11390068pfb.135.2019.09.06.07.53.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Sep 2019 07:53:28 -0700 (PDT) Subject: [PATCH v8 1/7] mm: Add per-cpu logic to page shuffling From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Fri, 06 Sep 2019 07:53:27 -0700 Message-ID: <20190906145327.32552.39455.stgit@localhost.localdomain> In-Reply-To: <20190906145213.32552.30160.stgit@localhost.localdomain> References: <20190906145213.32552.30160.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Alexander Duyck Change the logic used to generate randomness in the suffle path so that we can avoid cache line bouncing. The previous logic was sharing the offset and entropy word between all CPUs. As such this can result in cache line bouncing and will ultimately hurt performance when enabled. To resolve this I have moved to a per-cpu logic for maintaining a unsigned long containing some amount of bits, and an offset value for which bit we can use for entropy with each call. Signed-off-by: Alexander Duyck Reviewed-by: Dan Williams --- mm/shuffle.c | 33 +++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-) diff --git a/mm/shuffle.c b/mm/shuffle.c index 3ce12481b1dc..9ba542ecf335 100644 --- a/mm/shuffle.c +++ b/mm/shuffle.c @@ -183,25 +183,38 @@ void __meminit __shuffle_free_memory(pg_data_t *pgdat) shuffle_zone(z); } +struct batched_bit_entropy { + unsigned long entropy_bool; + int position; +}; + +static DEFINE_PER_CPU(struct batched_bit_entropy, batched_entropy_bool); + void add_to_free_area_random(struct page *page, struct free_area *area, int migratetype) { - static u64 rand; - static u8 rand_bits; + struct batched_bit_entropy *batch; + unsigned long entropy; + int position; /* - * The lack of locking is deliberate. If 2 threads race to - * update the rand state it just adds to the entropy. + * We shouldn't need to disable IRQs as the only caller is + * __free_one_page and it should only be called with the zone lock + * held and either from IRQ context or with local IRQs disabled. */ - if (rand_bits == 0) { - rand_bits = 64; - rand = get_random_u64(); + batch = raw_cpu_ptr(&batched_entropy_bool); + position = batch->position; + + if (--position < 0) { + batch->entropy_bool = get_random_long(); + position = BITS_PER_LONG - 1; } - if (rand & 1) + batch->position = position; + entropy = batch->entropy_bool; + + if (1ul & (entropy >> position)) add_to_free_area(page, area, migratetype); else add_to_free_area_tail(page, area, migratetype); - rand_bits--; - rand >>= 1; } From patchwork Fri Sep 6 14:53:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11135463 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 78FA31395 for ; Fri, 6 Sep 2019 14:53:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2C177206A5 for ; Fri, 6 Sep 2019 14:53:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="F08BO7BS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C177206A5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2B9096B000A; Fri, 6 Sep 2019 10:53:38 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 2908F6B000C; Fri, 6 Sep 2019 10:53:38 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1A5CD6B000D; Fri, 6 Sep 2019 10:53:38 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0168.hostedemail.com [216.40.44.168]) by kanga.kvack.org (Postfix) with ESMTP id EADAD6B000A for ; Fri, 6 Sep 2019 10:53:37 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 90AA3611D for ; Fri, 6 Sep 2019 14:53:37 +0000 (UTC) X-FDA: 75904789674.09.hand82_59baf5824b341 X-Spam-Summary: 2,0,0,8f79f42200b1120e,d41d8cd98f00b204,alexander.duyck@gmail.com,:nitesh@redhat.com:kvm@vger.kernel.org:mst@redhat.com:david@redhat.com:dave.hansen@intel.com:linux-kernel@vger.kernel.org:willy@infradead.org:mhocko@kernel.org::akpm@linux-foundation.org:virtio-dev@lists.oasis-open.org:osalvador@suse.de:yang.zhang.wz@gmail.com:pagupta@redhat.com:riel@surriel.com:konrad.wilk@oracle.com:lcapitulino@redhat.com:wei.w.wang@intel.com:aarcange@redhat.com:pbonzini@redhat.com:dan.j.williams@intel.com:alexander.h.duyck@linux.intel.com,RULES_HIT:1:2:41:69:152:355:379:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1593:1594:1605:1730:1747:1777:1792:2196:2198:2199:2200:2393:2559:2562:2693:2731:3138:3139:3140:3141:3142:3865:3866:3867:3868:3870:3871:3872:3874:4050:4321:4385:4605:5007:6261:6653:6737:7576:7807:7875:7974:9010:9036:9413:9592:10004:11026:11473:11658:11914:12043:12048:12291:12296:12297:12438:12517:12519:12555:12679:12683:12760:12986: 14093:14 X-HE-Tag: hand82_59baf5824b341 X-Filterd-Recvd-Size: 10559 Received: from mail-pf1-f194.google.com (mail-pf1-f194.google.com [209.85.210.194]) by imf12.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 14:53:36 +0000 (UTC) Received: by mail-pf1-f194.google.com with SMTP id q21so4634347pfn.11 for ; Fri, 06 Sep 2019 07:53:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=yrM68/18qPKHZ9DUNXRIzqwwEnWiG4Tl6cc4C1fGcgo=; b=F08BO7BSrGrfQeuaby107wTUULESYHMJ7AOaEF+Hn8D5HHpHpYjfiOdTOXZsgN96mb zo3cIiADSm7/YUbXVc9ff5E1bg9AZLc6AoFPIq979AlGhTl4bohVyZhnCWM1r7OyEmxr pfYSTAppGSDLHI+eetE+RJIow7NJz9/Ud08mUQ9gIInnCxKwk26kzCo4geaCyX5g1BDK xCK3WPe0f7vo9mv8eOFY6tuZqetwYK++GD9OnB/3eQP0DzzCjqZwvI27ul+Ek3ZizGoa KyluUVUB7KGqWoqEUtKgdn6uonAibcK9ouPqdNAMP17fsIm1YXqbs0JBhQ8MD30VZx/o N0Wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=yrM68/18qPKHZ9DUNXRIzqwwEnWiG4Tl6cc4C1fGcgo=; b=ORUfGSjEV1T08dTcVmdmG1Qx6ECASkbClEt7Now02eVXZg5m6YLXw8MaCV02tJofJ4 40pxfNppzza35dGxCGghJSS2gflODsCHMy35Dr3OTdrQ9Zmuf7puk2n8xoIqvtxpccqx /DFRKz0dRWFeyIWgzL0+bKfvrBto14ODCw8PoNJwTVkCZwjF6FVH2uz1CevSpCCf8Ifg lYoKK0eiOnM/08wk7raQvbcNvCP1Q9Fs32pA26XhoD/SYaxY4KRgbyQQn4JXb8C1TPEi yAZHgVtGhevyDjSwGY7fi+f1Z+rokHyZfxyuneIqCXYqf3VTnjxem1QagvoHw8oqjRjm 4ZOQ== X-Gm-Message-State: APjAAAXMxTTli1f+I47gUa8rWOj/UPpE6vAPWsLEvTaWk6N8d4gA30q8 GbZnE8VkKyqWl51Z505egsM= X-Google-Smtp-Source: APXvYqyrQkzzi8Sbhj6vhLTR4dGTZW+Kk2AIeDlnJIKM3KMBnXdma+i7svr0tEnpvrl548l+Yy3/6Q== X-Received: by 2002:a62:e403:: with SMTP id r3mr10963491pfh.251.1567781615299; Fri, 06 Sep 2019 07:53:35 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id 67sm5207877pjo.29.2019.09.06.07.53.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Sep 2019 07:53:34 -0700 (PDT) Subject: [PATCH v8 2/7] mm: Adjust shuffle code to allow for future coalescing From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Fri, 06 Sep 2019 07:53:34 -0700 Message-ID: <20190906145333.32552.95238.stgit@localhost.localdomain> In-Reply-To: <20190906145213.32552.30160.stgit@localhost.localdomain> References: <20190906145213.32552.30160.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Alexander Duyck Move the head/tail adding logic out of the shuffle code and into the __free_one_page function since ultimately that is where it is really needed anyway. By doing this we should be able to reduce the overhead and can consolidate all of the list addition bits in one spot. Signed-off-by: Alexander Duyck Reviewed-by: Dan Williams --- include/linux/mmzone.h | 12 -------- mm/page_alloc.c | 70 +++++++++++++++++++++++++++--------------------- mm/shuffle.c | 9 +----- mm/shuffle.h | 12 ++++++++ 4 files changed, 53 insertions(+), 50 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index bda20282746b..125f300981c6 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -116,18 +116,6 @@ static inline void add_to_free_area_tail(struct page *page, struct free_area *ar area->nr_free++; } -#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR -/* Used to preserve page allocation order entropy */ -void add_to_free_area_random(struct page *page, struct free_area *area, - int migratetype); -#else -static inline void add_to_free_area_random(struct page *page, - struct free_area *area, int migratetype) -{ - add_to_free_area(page, area, migratetype); -} -#endif - /* Used for pages which are on another list */ static inline void move_to_free_area(struct page *page, struct free_area *area, int migratetype) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c5d62f1c2851..4e4356ba66c7 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -878,6 +878,36 @@ static inline struct capture_control *task_capc(struct zone *zone) #endif /* CONFIG_COMPACTION */ /* + * If this is not the largest possible page, check if the buddy + * of the next-highest order is free. If it is, it's possible + * that pages are being freed that will coalesce soon. In case, + * that is happening, add the free page to the tail of the list + * so it's less likely to be used soon and more likely to be merged + * as a higher order page + */ +static inline bool +buddy_merge_likely(unsigned long pfn, unsigned long buddy_pfn, + struct page *page, unsigned int order) +{ + struct page *higher_page, *higher_buddy; + unsigned long combined_pfn; + + if (order >= MAX_ORDER - 2) + return false; + + if (!pfn_valid_within(buddy_pfn)) + return false; + + combined_pfn = buddy_pfn & pfn; + higher_page = page + (combined_pfn - pfn); + buddy_pfn = __find_buddy_pfn(combined_pfn, order + 1); + higher_buddy = higher_page + (buddy_pfn - combined_pfn); + + return pfn_valid_within(buddy_pfn) && + page_is_buddy(higher_page, higher_buddy, order + 1); +} + +/* * Freeing function for a buddy system allocator. * * The concept of a buddy system is to maintain direct-mapped table @@ -906,11 +936,12 @@ static inline void __free_one_page(struct page *page, struct zone *zone, unsigned int order, int migratetype) { - unsigned long combined_pfn; + struct capture_control *capc = task_capc(zone); unsigned long uninitialized_var(buddy_pfn); - struct page *buddy; + unsigned long combined_pfn; + struct free_area *area; unsigned int max_order; - struct capture_control *capc = task_capc(zone); + struct page *buddy; max_order = min_t(unsigned int, MAX_ORDER, pageblock_order + 1); @@ -979,35 +1010,12 @@ static inline void __free_one_page(struct page *page, done_merging: set_page_order(page, order); - /* - * If this is not the largest possible page, check if the buddy - * of the next-highest order is free. If it is, it's possible - * that pages are being freed that will coalesce soon. In case, - * that is happening, add the free page to the tail of the list - * so it's less likely to be used soon and more likely to be merged - * as a higher order page - */ - if ((order < MAX_ORDER-2) && pfn_valid_within(buddy_pfn) - && !is_shuffle_order(order)) { - struct page *higher_page, *higher_buddy; - combined_pfn = buddy_pfn & pfn; - higher_page = page + (combined_pfn - pfn); - buddy_pfn = __find_buddy_pfn(combined_pfn, order + 1); - higher_buddy = higher_page + (buddy_pfn - combined_pfn); - if (pfn_valid_within(buddy_pfn) && - page_is_buddy(higher_page, higher_buddy, order + 1)) { - add_to_free_area_tail(page, &zone->free_area[order], - migratetype); - return; - } - } - - if (is_shuffle_order(order)) - add_to_free_area_random(page, &zone->free_area[order], - migratetype); + area = &zone->free_area[order]; + if (is_shuffle_order(order) ? shuffle_pick_tail() : + buddy_merge_likely(pfn, buddy_pfn, page, order)) + add_to_free_area_tail(page, area, migratetype); else - add_to_free_area(page, &zone->free_area[order], migratetype); - + add_to_free_area(page, area, migratetype); } /* diff --git a/mm/shuffle.c b/mm/shuffle.c index 9ba542ecf335..345cb4347455 100644 --- a/mm/shuffle.c +++ b/mm/shuffle.c @@ -4,7 +4,6 @@ #include #include #include -#include #include #include "internal.h" #include "shuffle.h" @@ -190,8 +189,7 @@ struct batched_bit_entropy { static DEFINE_PER_CPU(struct batched_bit_entropy, batched_entropy_bool); -void add_to_free_area_random(struct page *page, struct free_area *area, - int migratetype) +bool __shuffle_pick_tail(void) { struct batched_bit_entropy *batch; unsigned long entropy; @@ -213,8 +211,5 @@ void add_to_free_area_random(struct page *page, struct free_area *area, batch->position = position; entropy = batch->entropy_bool; - if (1ul & (entropy >> position)) - add_to_free_area(page, area, migratetype); - else - add_to_free_area_tail(page, area, migratetype); + return 1ul & (entropy >> position); } diff --git a/mm/shuffle.h b/mm/shuffle.h index 777a257a0d2f..0723eb97f22f 100644 --- a/mm/shuffle.h +++ b/mm/shuffle.h @@ -3,6 +3,7 @@ #ifndef _MM_SHUFFLE_H #define _MM_SHUFFLE_H #include +#include /* * SHUFFLE_ENABLE is called from the command line enabling path, or by @@ -22,6 +23,7 @@ enum mm_shuffle_ctl { DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key); extern void page_alloc_shuffle(enum mm_shuffle_ctl ctl); extern void __shuffle_free_memory(pg_data_t *pgdat); +extern bool __shuffle_pick_tail(void); static inline void shuffle_free_memory(pg_data_t *pgdat) { if (!static_branch_unlikely(&page_alloc_shuffle_key)) @@ -43,6 +45,11 @@ static inline bool is_shuffle_order(int order) return false; return order >= SHUFFLE_ORDER; } + +static inline bool shuffle_pick_tail(void) +{ + return __shuffle_pick_tail(); +} #else static inline void shuffle_free_memory(pg_data_t *pgdat) { @@ -60,5 +67,10 @@ static inline bool is_shuffle_order(int order) { return false; } + +static inline bool shuffle_pick_tail(void) +{ + return false; +} #endif #endif /* _MM_SHUFFLE_H */ From patchwork Fri Sep 6 14:53:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11135467 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CFACB112B for ; Fri, 6 Sep 2019 14:53:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 930452082C for ; Fri, 6 Sep 2019 14:53:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Kx9ZIS92" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 930452082C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9E5EC6B000C; Fri, 6 Sep 2019 10:53:43 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 995896B000D; Fri, 6 Sep 2019 10:53:43 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8AAB26B000E; Fri, 6 Sep 2019 10:53:43 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0105.hostedemail.com [216.40.44.105]) by kanga.kvack.org (Postfix) with ESMTP id 678E06B000C for ; Fri, 6 Sep 2019 10:53:43 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 1879C824CA3B for ; Fri, 6 Sep 2019 14:53:43 +0000 (UTC) X-FDA: 75904789926.01.crush12_5a9320fb0604f X-Spam-Summary: 2,0,0,cf6c442fe6a84f27,d41d8cd98f00b204,alexander.duyck@gmail.com,:nitesh@redhat.com:kvm@vger.kernel.org:mst@redhat.com:david@redhat.com:dave.hansen@intel.com:linux-kernel@vger.kernel.org:willy@infradead.org:mhocko@kernel.org::akpm@linux-foundation.org:virtio-dev@lists.oasis-open.org:osalvador@suse.de:yang.zhang.wz@gmail.com:pagupta@redhat.com:riel@surriel.com:konrad.wilk@oracle.com:lcapitulino@redhat.com:wei.w.wang@intel.com:aarcange@redhat.com:pbonzini@redhat.com:dan.j.williams@intel.com:alexander.h.duyck@linux.intel.com,RULES_HIT:41:69:152:355:379:800:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1542:1593:1594:1711:1730:1747:1777:1792:2196:2198:2199:2200:2393:2559:2562:2693:2731:2740:2896:3138:3139:3140:3141:3142:3354:3865:3866:3867:3868:3870:3871:3872:3874:4117:4250:4321:4385:5007:6261:6653:6737:7576:7875:7903:9413:9592:10004:10400:11026:11473:11658:11914:12043:12048:12114:12296:12297:12438:12517:12519:12555:12663:12 679:1276 X-HE-Tag: crush12_5a9320fb0604f X-Filterd-Recvd-Size: 6283 Received: from mail-pl1-f195.google.com (mail-pl1-f195.google.com [209.85.214.195]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 14:53:42 +0000 (UTC) Received: by mail-pl1-f195.google.com with SMTP id b10so3283476plr.4 for ; Fri, 06 Sep 2019 07:53:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=XeOFbkXePrFioXOb6FAIERJbwcp7KIiK2/+DoMA6rcA=; b=Kx9ZIS92cpUp5XYIgowvjW7gz1qiMuGj8JlFJNvG2oheLU6d8RkrFPqNoYDIqBlCgC 7yWJrSWC5qsnaNG1td/FhR/Eh7krX8YN3gNEQb7XZDOqw7RIgh/pq97J7x9Dy1Bh+QMK tBooMcRP+jUXwbQAoJ7u4uaWvZxlz0NvfE453INuDbkjU92ytM1GjgzEhFudHkrULMBu x4I1vfYTMCxzZR5yPeVXEd5nvbYKNtky10MfXkhJ3d31ysg4eDDfOLhqQxUr7ILHA0mZ dqp0UtKqt+MixfklXN0qXJm6oUF1E5nRNfabdr0WG9xY8NE8ppzlso5wyOA8+CO4RtcK JeXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=XeOFbkXePrFioXOb6FAIERJbwcp7KIiK2/+DoMA6rcA=; b=Wq1RrlX/56FcC7lMM01fsXYgrcN7lhgkOfFAwjuSTbzfGUXO9j7BX5Y/UcmmmUc2kU 1Ce+cKJ/d+R16kl+43TFg1DJ7Tlq0I/PGXhgRVVASKMSEa23TcBuZePA94jSQ8Ehwdmg XhzJRqy8UDQ2wsYVj5CqOV7trti9x1IurNiYW/BPQsL9oDWwCGpJtIVNHDcg7CEoTa/e LHOC9g1ozbCR4H6NyxGCuav7AbzsW5W0IfVmhOoDzYuqcc/0ZIxw4hvL+xBGWwuRBNGT 7hkj1hyGPmLvKCBTsSqs99VTs/SQW9zpMWVsqxBqGOQ6yOm2/EU2ThJOLvzpsO8lqEm9 EwkQ== X-Gm-Message-State: APjAAAWssWhhVjJYKDnlJCpkzoJJpssQQJqUhlGwfyC1YaFLnnl3QitG w9/9WK/JnYHHm2R8tId0pVs= X-Google-Smtp-Source: APXvYqxhaJ6uuXR8fGWWr/ufBumPF6vYW2fu4W//uKfSwtowVRUUh4NcMog0BEj7MwBiHEYx30eOGA== X-Received: by 2002:a17:902:36a:: with SMTP id 97mr9103349pld.75.1567781621416; Fri, 06 Sep 2019 07:53:41 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id d15sm6060563pfo.118.2019.09.06.07.53.40 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Sep 2019 07:53:41 -0700 (PDT) Subject: [PATCH v8 3/7] mm: Move set/get_pcppage_migratetype to mmzone.h From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Fri, 06 Sep 2019 07:53:40 -0700 Message-ID: <20190906145340.32552.49026.stgit@localhost.localdomain> In-Reply-To: <20190906145213.32552.30160.stgit@localhost.localdomain> References: <20190906145213.32552.30160.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Alexander Duyck In order to support page reporting it will be necessary to store and retrieve the migratetype of a page. To enable that I am moving the set and get operations for pcppage_migratetype into the mm/internal.h header so that they can be used outside of the page_alloc.c file. Reviewed-by: Dan Williams Signed-off-by: Alexander Duyck --- mm/internal.h | 18 ++++++++++++++++++ mm/page_alloc.c | 18 ------------------ 2 files changed, 18 insertions(+), 18 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index 0d5f720c75ab..e4a1a57bbd40 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -549,6 +549,24 @@ static inline bool is_migrate_highatomic_page(struct page *page) return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC; } +/* + * A cached value of the page's pageblock's migratetype, used when the page is + * put on a pcplist. Used to avoid the pageblock migratetype lookup when + * freeing from pcplists in most cases, at the cost of possibly becoming stale. + * Also the migratetype set in the page does not necessarily match the pcplist + * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any + * other index - this ensures that it will be put on the correct CMA freelist. + */ +static inline int get_pcppage_migratetype(struct page *page) +{ + return page->index; +} + +static inline void set_pcppage_migratetype(struct page *page, int migratetype) +{ + page->index = migratetype; +} + void setup_zone_pageset(struct zone *zone); extern struct page *alloc_new_node_page(struct page *page, unsigned long node); #endif /* __MM_INTERNAL_H */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 4e4356ba66c7..a791f2baeeeb 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -185,24 +185,6 @@ static int __init early_init_on_free(char *buf) } early_param("init_on_free", early_init_on_free); -/* - * A cached value of the page's pageblock's migratetype, used when the page is - * put on a pcplist. Used to avoid the pageblock migratetype lookup when - * freeing from pcplists in most cases, at the cost of possibly becoming stale. - * Also the migratetype set in the page does not necessarily match the pcplist - * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any - * other index - this ensures that it will be put on the correct CMA freelist. - */ -static inline int get_pcppage_migratetype(struct page *page) -{ - return page->index; -} - -static inline void set_pcppage_migratetype(struct page *page, int migratetype) -{ - page->index = migratetype; -} - #ifdef CONFIG_PM_SLEEP /* * The following functions are used by the suspend/hibernate code to temporarily From patchwork Fri Sep 6 14:53:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11135471 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 60CDE1395 for ; Fri, 6 Sep 2019 14:53:52 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1392220842 for ; Fri, 6 Sep 2019 14:53:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZXqpLzFz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1392220842 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id EEDDA6B000D; Fri, 6 Sep 2019 10:53:50 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id E9E746B000E; Fri, 6 Sep 2019 10:53:50 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D8E8D6B0010; Fri, 6 Sep 2019 10:53:50 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0050.hostedemail.com [216.40.44.50]) by kanga.kvack.org (Postfix) with ESMTP id B976C6B000D for ; Fri, 6 Sep 2019 10:53:50 -0400 (EDT) Received: from smtpin11.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 80918180AD801 for ; Fri, 6 Sep 2019 14:53:49 +0000 (UTC) X-FDA: 75904790178.11.toys02_5b7fca451224a X-Spam-Summary: 2,0,0,7d4c18273f220258,d41d8cd98f00b204,alexander.duyck@gmail.com,:nitesh@redhat.com:kvm@vger.kernel.org:mst@redhat.com:david@redhat.com:dave.hansen@intel.com:linux-kernel@vger.kernel.org:willy@infradead.org:mhocko@kernel.org::akpm@linux-foundation.org:virtio-dev@lists.oasis-open.org:osalvador@suse.de:yang.zhang.wz@gmail.com:pagupta@redhat.com:riel@surriel.com:konrad.wilk@oracle.com:lcapitulino@redhat.com:wei.w.wang@intel.com:aarcange@redhat.com:pbonzini@redhat.com:dan.j.williams@intel.com:alexander.h.duyck@linux.intel.com,RULES_HIT:1:2:41:69:152:355:379:560:800:960:965:966:968:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1593:1594:1605:1730:1747:1777:1792:2196:2198:2199:2200:2393:2559:2562:2693:2731:2898:2901:3138:3139:3140:3141:3142:3865:3866:3867:3868:3870:3871:3872:3874:4051:4321:4385:4390:4395:4605:5007:6119:6261:6653:6737:7576:7974:8603:8957:9010:9036:9413:9592:10004:11026:11473:11658:11914:12043:12048:12291:12296:12297:12438:1 2517:125 X-HE-Tag: toys02_5b7fca451224a X-Filterd-Recvd-Size: 12071 Received: from mail-pg1-f196.google.com (mail-pg1-f196.google.com [209.85.215.196]) by imf19.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 14:53:48 +0000 (UTC) Received: by mail-pg1-f196.google.com with SMTP id n4so3651882pgv.2 for ; Fri, 06 Sep 2019 07:53:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=jkU/gjmufsqRmx2ewcmEVgVxHQ2U0aGjpCpcoEVZSho=; b=ZXqpLzFz2FOqM7wbnFA06GAoTNb6ei5piYez3sF20zkakEGZnTFFMronUD4CttZyiV B17ik99HO+u3uB9zje7wGEb3UmI2D9r1Mu13APQsqu3STpDcZczuhriV5Bd/msAFOAIF bgGhZq9ldDjmVt7XfMbIPeu0sgMh/uz1lXA3QnTknikQQjMZYnfCnd/Bppt0ZxAvDaul pkaWzrx8xude0fUoI7JozT1IH8Jr1LjABPpOtlHCy35j6xq6ex6gETBguZdrYS6cSeHO UueP2Rt58VYp3HAcIWa1hGC0ckNbLS1m3nFaKTorjv+gN1RGPwgFgrBf48c8eXk/4kQZ zNJg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=jkU/gjmufsqRmx2ewcmEVgVxHQ2U0aGjpCpcoEVZSho=; b=Z/mcT7zeaHoDq/kRRcO/js6pkFIxq86fveVFBL9exAWCvCaYjwXHOLldifoNWy2foi OMbS1oizV+B49u7t9qeM2nrFJXSuCp1rbmpN4PRMQxQc9+r4BYkJly0MvP2W7jcPpxGC QEeSVjGZ6+uyLrjhfG1mHJZ/B+YQZXg59wFIw4aPF+VSGblGXhBebG1NtPtBgjAEQS3q CNPmYZwCzDtEqDP6WU+BmhWaBPg2wEHxT1WnOuX1THBDS6OAL0iPT0QYIlyDGK2BEmv7 Gsvv7lFHPtBBfwSanTbOssBoAAkGx3nQQhUJX2y/wGmx9JtvOT941xTFfm4DzTAZb+Iw MTHw== X-Gm-Message-State: APjAAAUjVkozbCGBQTq1hIC2yP5inQ3tgFPv9ur/L+InjHsbt13UrZ3e NDFPqk2ICEvcmyGwZBAVKXA= X-Google-Smtp-Source: APXvYqzgaeC1dp0XTioS4mneCH/3k0tYX6V2gbFnlIyllp1R0fBkI7Tcr0fy2oUOtlXdnP9INbwSag== X-Received: by 2002:a17:90a:bb89:: with SMTP id v9mr2009978pjr.88.1567781627508; Fri, 06 Sep 2019 07:53:47 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id e10sm8013207pfh.77.2019.09.06.07.53.46 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Sep 2019 07:53:47 -0700 (PDT) Subject: [PATCH v8 4/7] mm: Use zone and order instead of free area in free_list manipulators From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Fri, 06 Sep 2019 07:53:46 -0700 Message-ID: <20190906145346.32552.68360.stgit@localhost.localdomain> In-Reply-To: <20190906145213.32552.30160.stgit@localhost.localdomain> References: <20190906145213.32552.30160.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Alexander Duyck In order to enable the use of the zone from the list manipulator functions I will need access to the zone pointer. As it turns out most of the accessors were always just being directly passed &zone->free_area[order] anyway so it would make sense to just fold that into the function itself and pass the zone and order as arguments instead of the free area. In order to be able to reference the zone we need to move the declaration of the functions down so that we have the zone defined before we define the list manipulation functions. Reviewed-by: Dan Williams Reviewed-by: David Hildenbrand Reviewed-by: Pankaj Gupta Signed-off-by: Alexander Duyck --- include/linux/mmzone.h | 70 ++++++++++++++++++++++++++---------------------- mm/page_alloc.c | 30 ++++++++------------- 2 files changed, 49 insertions(+), 51 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 125f300981c6..2ddf1f1971c0 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -100,29 +100,6 @@ struct free_area { unsigned long nr_free; }; -/* Used for pages not on another list */ -static inline void add_to_free_area(struct page *page, struct free_area *area, - int migratetype) -{ - list_add(&page->lru, &area->free_list[migratetype]); - area->nr_free++; -} - -/* Used for pages not on another list */ -static inline void add_to_free_area_tail(struct page *page, struct free_area *area, - int migratetype) -{ - list_add_tail(&page->lru, &area->free_list[migratetype]); - area->nr_free++; -} - -/* Used for pages which are on another list */ -static inline void move_to_free_area(struct page *page, struct free_area *area, - int migratetype) -{ - list_move(&page->lru, &area->free_list[migratetype]); -} - static inline struct page *get_page_from_free_area(struct free_area *area, int migratetype) { @@ -130,15 +107,6 @@ static inline struct page *get_page_from_free_area(struct free_area *area, struct page, lru); } -static inline void del_page_from_free_area(struct page *page, - struct free_area *area) -{ - list_del(&page->lru); - __ClearPageBuddy(page); - set_page_private(page, 0); - area->nr_free--; -} - static inline bool free_area_empty(struct free_area *area, int migratetype) { return list_empty(&area->free_list[migratetype]); @@ -796,6 +764,44 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat) return !pgdat->node_start_pfn && !pgdat->node_spanned_pages; } +/* Used for pages not on another list */ +static inline void add_to_free_list(struct page *page, struct zone *zone, + unsigned int order, int migratetype) +{ + struct free_area *area = &zone->free_area[order]; + + list_add(&page->lru, &area->free_list[migratetype]); + area->nr_free++; +} + +/* Used for pages not on another list */ +static inline void add_to_free_list_tail(struct page *page, struct zone *zone, + unsigned int order, int migratetype) +{ + struct free_area *area = &zone->free_area[order]; + + list_add_tail(&page->lru, &area->free_list[migratetype]); + area->nr_free++; +} + +/* Used for pages which are on another list */ +static inline void move_to_free_list(struct page *page, struct zone *zone, + unsigned int order, int migratetype) +{ + struct free_area *area = &zone->free_area[order]; + + list_move(&page->lru, &area->free_list[migratetype]); +} + +static inline void del_page_from_free_list(struct page *page, struct zone *zone, + unsigned int order) +{ + list_del(&page->lru); + __ClearPageBuddy(page); + set_page_private(page, 0); + zone->free_area[order].nr_free--; +} + #include void build_all_zonelists(pg_data_t *pgdat); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a791f2baeeeb..f85dc1561b85 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -921,7 +921,6 @@ static inline void __free_one_page(struct page *page, struct capture_control *capc = task_capc(zone); unsigned long uninitialized_var(buddy_pfn); unsigned long combined_pfn; - struct free_area *area; unsigned int max_order; struct page *buddy; @@ -958,7 +957,7 @@ static inline void __free_one_page(struct page *page, if (page_is_guard(buddy)) clear_page_guard(zone, buddy, order, migratetype); else - del_page_from_free_area(buddy, &zone->free_area[order]); + del_page_from_free_list(buddy, zone, order); combined_pfn = buddy_pfn & pfn; page = page + (combined_pfn - pfn); pfn = combined_pfn; @@ -992,12 +991,11 @@ static inline void __free_one_page(struct page *page, done_merging: set_page_order(page, order); - area = &zone->free_area[order]; if (is_shuffle_order(order) ? shuffle_pick_tail() : buddy_merge_likely(pfn, buddy_pfn, page, order)) - add_to_free_area_tail(page, area, migratetype); + add_to_free_list_tail(page, zone, order, migratetype); else - add_to_free_area(page, area, migratetype); + add_to_free_list(page, zone, order, migratetype); } /* @@ -2001,13 +1999,11 @@ void __init init_cma_reserved_pageblock(struct page *page) * -- nyc */ static inline void expand(struct zone *zone, struct page *page, - int low, int high, struct free_area *area, - int migratetype) + int low, int high, int migratetype) { unsigned long size = 1 << high; while (high > low) { - area--; high--; size >>= 1; VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]); @@ -2021,7 +2017,7 @@ static inline void expand(struct zone *zone, struct page *page, if (set_page_guard(zone, &page[size], high, migratetype)) continue; - add_to_free_area(&page[size], area, migratetype); + add_to_free_list(&page[size], zone, high, migratetype); set_page_order(&page[size], high); } } @@ -2179,8 +2175,8 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, page = get_page_from_free_area(area, migratetype); if (!page) continue; - del_page_from_free_area(page, area); - expand(zone, page, order, current_order, area, migratetype); + del_page_from_free_list(page, zone, current_order); + expand(zone, page, order, current_order, migratetype); set_pcppage_migratetype(page, migratetype); return page; } @@ -2188,7 +2184,6 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, return NULL; } - /* * This array describes the order lists are fallen back to when * the free lists for the desirable migrate type are depleted @@ -2254,7 +2249,7 @@ static int move_freepages(struct zone *zone, VM_BUG_ON_PAGE(page_zone(page) != zone, page); order = page_order(page); - move_to_free_area(page, &zone->free_area[order], migratetype); + move_to_free_list(page, zone, order, migratetype); page += 1 << order; pages_moved += 1 << order; } @@ -2370,7 +2365,6 @@ static void steal_suitable_fallback(struct zone *zone, struct page *page, unsigned int alloc_flags, int start_type, bool whole_block) { unsigned int current_order = page_order(page); - struct free_area *area; int free_pages, movable_pages, alike_pages; int old_block_type; @@ -2441,8 +2435,7 @@ static void steal_suitable_fallback(struct zone *zone, struct page *page, return; single_page: - area = &zone->free_area[current_order]; - move_to_free_area(page, area, start_type); + move_to_free_list(page, zone, current_order, start_type); } /* @@ -3113,7 +3106,6 @@ void split_page(struct page *page, unsigned int order) int __isolate_free_page(struct page *page, unsigned int order) { - struct free_area *area = &page_zone(page)->free_area[order]; unsigned long watermark; struct zone *zone; int mt; @@ -3139,7 +3131,7 @@ int __isolate_free_page(struct page *page, unsigned int order) /* Remove page from free list */ - del_page_from_free_area(page, area); + del_page_from_free_list(page, zone, order); /* * Set the pageblock if the isolated page is at least half of a @@ -8560,7 +8552,7 @@ void zone_pcp_reset(struct zone *zone) pr_info("remove from free list %lx %d %lx\n", pfn, 1 << order, end_pfn); #endif - del_page_from_free_area(page, &zone->free_area[order]); + del_page_from_free_list(page, zone, order); for (i = 0; i < (1 << order); i++) SetPageReserved((page+i)); pfn += (1 << order); From patchwork Fri Sep 6 14:53:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11135475 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C364B112B for ; Fri, 6 Sep 2019 14:53:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5B5422082C for ; Fri, 6 Sep 2019 14:53:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="CrkQ7Ubf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B5422082C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E05196B000E; Fri, 6 Sep 2019 10:53:56 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id DD97C6B0010; Fri, 6 Sep 2019 10:53:56 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C7B146B0266; Fri, 6 Sep 2019 10:53:56 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0239.hostedemail.com [216.40.44.239]) by kanga.kvack.org (Postfix) with ESMTP id 935896B000E for ; Fri, 6 Sep 2019 10:53:56 -0400 (EDT) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 310B72826 for ; Fri, 6 Sep 2019 14:53:56 +0000 (UTC) X-FDA: 75904790472.29.fog25_5c6c1145b1553 X-Spam-Summary: 2,0,0,22a523196f6925f8,d41d8cd98f00b204,alexander.duyck@gmail.com,:nitesh@redhat.com:kvm@vger.kernel.org:mst@redhat.com:david@redhat.com:dave.hansen@intel.com:linux-kernel@vger.kernel.org:willy@infradead.org:mhocko@kernel.org::akpm@linux-foundation.org:virtio-dev@lists.oasis-open.org:osalvador@suse.de:yang.zhang.wz@gmail.com:pagupta@redhat.com:riel@surriel.com:konrad.wilk@oracle.com:lcapitulino@redhat.com:wei.w.wang@intel.com:aarcange@redhat.com:pbonzini@redhat.com:dan.j.williams@intel.com:alexander.h.duyck@linux.intel.com,RULES_HIT:152:327:355:379:421:960:966:968:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1593:1594:1605:1730:1747:1777:1792:1801:2194:2196:2197:2198:2199:2200:2201:2202:2393:2559:2562:2689:2693:2731:2892:2895:2897:3138:3139:3140:3141:3142:3369:3743:3865:3866:3867:3868:3870:3871:3872:3874:4250:4321:4385:4423:4605:5007:6261:6653:6737:7576:7875:7903:7974:8531:8603:8660:8957:9010:9121:9413:10004:10128:11026:11914:12043:1 2048:122 X-HE-Tag: fog25_5c6c1145b1553 X-Filterd-Recvd-Size: 34391 Received: from mail-pf1-f193.google.com (mail-pf1-f193.google.com [209.85.210.193]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 14:53:54 +0000 (UTC) Received: by mail-pf1-f193.google.com with SMTP id q5so4634179pfg.13 for ; Fri, 06 Sep 2019 07:53:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=nzTy41g/GpAOV13NdKm2582Sj65+fwTc4KknRdTfmzw=; b=CrkQ7UbfnnH+bkirYxxie97YClHnRLrvc3z2TaSzMCHiNbOietVOAvXrD93tFZK7Nw vgjsLGN+JoxIUNWlh3//OQRCQEm6KPcdg+TvnxkTbEKy6mvJCEFZqR7pHErFuoqrBGsc +Rsg9RWZpZ/CbxGp942kHeAIq4vfMT9Mlo7YMPr+sahJWyk8vhr4aI8xstTXK3R86Shj 5aXZ2vvizVJAzlySSO+sOU3vmSb8FGnxSUto+gKxMcUCcfL9ZpfEqG/RG5CGqT8GLn6k ewUry+Un1pVhWAnAW1eqmujVsit2CnZEclDP0CRMQnIjnnYV9sjkiB7AImBF0NMI5lOY D+xA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=nzTy41g/GpAOV13NdKm2582Sj65+fwTc4KknRdTfmzw=; b=VYSdfti8zBAlnxvnZL+f89tOxUMflPKXxML3BC36M0GW2HAg57+7a6jQ1OlSwBaaWV pxQMAbhAY4OGpHRd6v46HNGexOP5L5vNXgQY/X3kcDB9odGkqQsP4imxxWEHoWpLHuGK 2tCrH6H+lgl6ZESQhDkqa3aGGd+9d3Znh/8l6WvBvSmwVUjwnecTETKMB4Fd2BF4AKQm OFL/p4jNjaouerjxbZy7OIQZvtkkMT4CEsrAuJv49+91Qp/L3BI9/WfqI2iBsif5mzUN ax39PwlXdhP6BnVOmlpx6P8wy7zkSP2fuqWthD+Dowi2z4uEwPeMV3sWxgjf+ofEAW3T okXg== X-Gm-Message-State: APjAAAWp06BUKqMlfQ750wffCoJCnIM9fiPuFjismw9YYeYL7uBTeeH6 Z1ynhFPei+k0S0QqFfYGUMQ= X-Google-Smtp-Source: APXvYqzYmeMNB3L0sg/4NLClN7cQxr1w5/a+JUw3AUZ3dIqzqXmvt1Md2oSdYU6fA1LaUHK9yHiyrA== X-Received: by 2002:a62:55c1:: with SMTP id j184mr11134083pfb.104.1567781633744; Fri, 06 Sep 2019 07:53:53 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id bb7sm5368297pjb.2.2019.09.06.07.53.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Sep 2019 07:53:53 -0700 (PDT) Subject: [PATCH v8 5/7] mm: Introduce Reported pages From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Fri, 06 Sep 2019 07:53:52 -0700 Message-ID: <20190906145352.32552.21685.stgit@localhost.localdomain> In-Reply-To: <20190906145213.32552.30160.stgit@localhost.localdomain> References: <20190906145213.32552.30160.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Alexander Duyck In order to pave the way for free page reporting in virtualized environments we will need a way to get pages out of the free lists and identify those pages after they have been returned. To accomplish this, this patch adds the concept of a Reported Buddy, which is essentially meant to just be the Uptodate flag used in conjunction with the Buddy page type. It adds a set of pointers we shall call "boundary" which represents the upper boundary between the unreported and reported pages. The general idea is that in order for a page to cross from one side of the boundary to the other it will need to go through the reporting process. Ultimately a free_list has been fully processed when the boundary has been moved from the tail all they way up to occupying the first entry in the list. Doing this we should be able to make certain that we keep the reported pages as one contiguous block in each free list. This will allow us to efficiently manipulate the free lists whenever we need to go in and start sending reports to the hypervisor that there are new pages that have been freed and are no longer in use. An added advantage to this approach is that we should be reducing the overall memory footprint of the guest as it will be more likely to recycle warm pages versus trying to allocate the reported pages that were likely evicted from the guest memory. Since we will only be reporting one zone at a time we keep the boundary limited to being defined for just the zone we are currently reporting pages from. Doing this we can keep the number of additional pointers needed quite small. To flag that the boundaries are in place we use a single bit in the zone to indicate that reporting and the boundaries are active. The determination of when to start reporting is based on the tracking of the number of free pages in a given area versus the number of reported pages in that area. We keep track of the number of reported pages per free_area in a separate zone specific area. We do this to avoid modifying the free_area structure as this can lead to false sharing for the highest order with the zone lock which leads to a noticeable performance degradation. Signed-off-by: Alexander Duyck --- include/linux/mmzone.h | 52 ++++++ include/linux/page-flags.h | 11 + include/linux/page_reporting.h | 177 +++++++++++++++++++++ mm/Kconfig | 5 + mm/Makefile | 1 mm/memory_hotplug.c | 1 mm/page_alloc.c | 114 +++++++++++++ mm/page_reporting.c | 340 ++++++++++++++++++++++++++++++++++++++++ 8 files changed, 691 insertions(+), 10 deletions(-) create mode 100644 include/linux/page_reporting.h create mode 100644 mm/page_reporting.c diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 2ddf1f1971c0..4b2c44d7e266 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -463,6 +463,14 @@ struct zone { seqlock_t span_seqlock; #endif +#ifdef CONFIG_PAGE_REPORTING + /* + * Pointer to reported page tracking statistics array. The size of + * the array is MAX_ORDER - PAGE_REPORTING_MIN_ORDER. NULL when + * unused page reporting is not present. + */ + unsigned long *reported_pages; +#endif int initialized; /* Write-intensive fields used from the page allocator */ @@ -538,6 +546,14 @@ enum zone_flags { ZONE_BOOSTED_WATERMARK, /* zone recently boosted watermarks. * Cleared when kswapd is woken. */ + ZONE_PAGE_REPORTING_REQUESTED, /* zone enabled page reporting and has + * requested flushing the data out of + * higher order pages. + */ + ZONE_PAGE_REPORTING_ACTIVE, /* zone enabled page reporting and is + * activly flushing the data out of + * higher order pages. + */ }; static inline unsigned long zone_managed_pages(struct zone *zone) @@ -764,6 +780,8 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat) return !pgdat->node_start_pfn && !pgdat->node_spanned_pages; } +#include + /* Used for pages not on another list */ static inline void add_to_free_list(struct page *page, struct zone *zone, unsigned int order, int migratetype) @@ -778,24 +796,48 @@ static inline void add_to_free_list(struct page *page, struct zone *zone, static inline void add_to_free_list_tail(struct page *page, struct zone *zone, unsigned int order, int migratetype) { - struct free_area *area = &zone->free_area[order]; + struct list_head *tail = get_unreported_tail(zone, order, migratetype); - list_add_tail(&page->lru, &area->free_list[migratetype]); - area->nr_free++; + /* + * To prevent the unreported pages from being interleaved with the + * reported ones while we are actively processing pages we will use + * the head of the reported pages to determine the tail of the free + * list. + */ + list_add_tail(&page->lru, tail); + zone->free_area[order].nr_free++; } /* Used for pages which are on another list */ static inline void move_to_free_list(struct page *page, struct zone *zone, unsigned int order, int migratetype) { - struct free_area *area = &zone->free_area[order]; + struct list_head *tail = get_unreported_tail(zone, order, migratetype); + + /* + * We must get the tail for our target list before moving the page on + * the reported list as we will possibly be replacing the tail page of + * the list with our current page if it is reported. + */ + if (unlikely(PageReported(page))) + move_page_to_reported_list(page, zone, migratetype); - list_move(&page->lru, &area->free_list[migratetype]); + /* + * To prevent unreported pages from being mixed with the reported + * ones we add pages to the tail of the list. By doing this the function + * above can either label them as included in the reported list or not + * and the result will be consistent. + */ + list_move_tail(&page->lru, tail); } static inline void del_page_from_free_list(struct page *page, struct zone *zone, unsigned int order) { + /* remove page from reported list, and clear reported state */ + if (unlikely(PageReported(page))) + del_page_from_reported_list(page, zone); + list_del(&page->lru); __ClearPageBuddy(page); set_page_private(page, 0); diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index f91cb8898ff0..759a3b3956f2 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -163,6 +163,9 @@ enum pageflags { /* non-lru isolated movable page */ PG_isolated = PG_reclaim, + + /* Buddy pages. Used to track which pages have been reported */ + PG_reported = PG_uptodate, }; #ifndef __GENERATING_BOUNDS_H @@ -432,6 +435,14 @@ static inline bool set_hwpoison_free_buddy_page(struct page *page) #endif /* + * PageReported() is used to track reported free pages within the Buddy + * allocator. We can use the non-atomic version of the test and set + * operations as both should be shielded with the zone lock to prevent + * any possible races on the setting or clearing of the bit. + */ +__PAGEFLAG(Reported, reported, PF_NO_COMPOUND) + +/* * On an anonymous page mapped into a user virtual memory area, * page->mapping points to its anon_vma, not to a struct address_space; * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. diff --git a/include/linux/page_reporting.h b/include/linux/page_reporting.h new file mode 100644 index 000000000000..5d434a7f8e16 --- /dev/null +++ b/include/linux/page_reporting.h @@ -0,0 +1,177 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_PAGE_REPORTING_H +#define _LINUX_PAGE_REPORTING_H + +#include +#include +#include + +#if defined(CONFIG_HUGETLB_PAGE) && HUGETLB_PAGE_ORDER < MAX_ORDER +#define PAGE_REPORTING_MIN_ORDER HUGETLB_PAGE_ORDER +#else +#define PAGE_REPORTING_MIN_ORDER (MAX_ORDER - 1) +#endif +#define PAGE_REPORTING_HWM 32 + +#ifdef CONFIG_PAGE_REPORTING +struct page_reporting_dev_info { + /* function that alters pages to make them "reported" */ + void (*report)(struct page_reporting_dev_info *phdev, + unsigned int nents); + + /* scatterlist containing pages to be processed */ + struct scatterlist *sg; + + /* + * Upper limit on the number of pages that the react function + * expects to be placed into the batch list to be processed. + */ + unsigned long capacity; + + /* work struct for processing reports */ + struct delayed_work work; + + /* + * The number of zones requesting reporting, plus one additional if + * processing thread is active. + */ + atomic_t refcnt; +}; + +/* Boundary functions */ +struct list_head *__page_reporting_get_boundary(unsigned int order, + int migratetype); +void page_reporting_del_from_boundary(struct page *page, struct zone *zone); +void page_reporting_add_to_boundary(struct page *page, struct zone *zone, + int migratetype); +void page_reporting_move_to_boundary(struct page *page, struct zone *zone, + int migratetype); + +/* Reported page accessors, defined in page_alloc.c */ +struct page *get_unreported_page(struct zone *zone, unsigned int order, + int migratetype); +void free_reported_page(struct page *page, unsigned int order); + +/* Tear-down and bring-up for page reporting devices */ +void page_reporting_shutdown(struct page_reporting_dev_info *phdev); +int page_reporting_startup(struct page_reporting_dev_info *phdev); + +void __page_reporting_free_stats(struct zone *zone); +void __page_reporting_request(struct zone *zone); +#endif /* CONFIG_PAGE_REPORTING */ + +/* + * Method for obtaining the tail of the free list. Using this allows for + * tail insertions of unreported pages into the region that is currently + * being scanned so as to avoid interleaving reported and unreported pages. + */ +static inline struct list_head * +get_unreported_tail(struct zone *zone, unsigned int order, int migratetype) +{ +#ifdef CONFIG_PAGE_REPORTING + if (order >= PAGE_REPORTING_MIN_ORDER && + test_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags)) + return __page_reporting_get_boundary(order, migratetype); +#endif + return &zone->free_area[order].free_list[migratetype]; +} + +/* + * Functions for adding/removing pages from reported end of list. + * All of them expect the zone lock to be held to maintain + * consistency of the reported list as a subset of the free list. + */ +static inline void add_page_to_reported_list(struct page *page, + struct zone *zone, + int order, + int migratetype) +{ +#ifdef CONFIG_PAGE_REPORTING + /* flag page as reported */ + __SetPageReported(page); + + /* update areated page accounting */ + zone->reported_pages[order - PAGE_REPORTING_MIN_ORDER]++; + + /* update boundary of new migratetype and record it */ + page_reporting_add_to_boundary(page, zone, migratetype); +#endif +} + +static inline void del_page_from_reported_list(struct page *page, + struct zone *zone) +{ +#ifdef CONFIG_PAGE_REPORTING + /* push boundary back if we removed the upper boundary */ + if (test_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags)) + page_reporting_del_from_boundary(page, zone); + + /* page_private will contain the page order, so just use it directly */ + zone->reported_pages[page_private(page) - PAGE_REPORTING_MIN_ORDER]--; + + /* clear the flag so we can report on it when it returns */ + __ClearPageReported(page); +#endif +} + +static inline void move_page_to_reported_list(struct page *page, + struct zone *zone, + int migratetype) +{ +#ifdef CONFIG_PAGE_REPORTING + page_reporting_move_to_boundary(page, zone, migratetype); +#endif +} + +/* Free reported_pages and reset reported page tracking count to 0 */ +static inline void page_reporting_reset(struct zone *zone) +{ +#ifdef CONFIG_PAGE_REPORTING + if (zone->reported_pages) + __page_reporting_free_stats(zone); +#endif +} + +DECLARE_STATIC_KEY_FALSE(page_reporting_notify_enabled); + +/** + * page_reporting_notify_free - Free page notification to start page processing + * @zone: Pointer to current zone of last page processed + * @order: Order of last page added to zone + * + * This function is meant to act as a screener for __page_reporting_request + * which will determine if a give zone has crossed over the high-water mark + * that will justify us beginning page treatment. If we have crossed that + * threshold then it will start the process of pulling some pages and + * placing them in the batch list for treatment. + */ +static inline void page_reporting_notify_free(struct zone *zone, int order) +{ +#ifdef CONFIG_PAGE_REPORTING + unsigned long nr_reported; + + /* Called from hot path in __free_one_page() */ + if (!static_branch_unlikely(&page_reporting_notify_enabled)) + return; + + /* Limit notifications only to higher order pages */ + if (order < PAGE_REPORTING_MIN_ORDER) + return; + + /* Do not bother with tests if we have already requested reporting */ + if (test_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags)) + return; + + /* If reported_pages is not populated, assume 0 */ + nr_reported = zone->reported_pages ? + zone->reported_pages[order - PAGE_REPORTING_MIN_ORDER] : 0; + + /* Only request it if we have enough to begin the page reporting */ + if (zone->free_area[order].nr_free < nr_reported + PAGE_REPORTING_HWM) + return; + + /* This is slow, but should be called very rarely */ + __page_reporting_request(zone); +#endif +} +#endif /*_LINUX_PAGE_REPORTING_H */ diff --git a/mm/Kconfig b/mm/Kconfig index a5dae9a7eb51..be1a5db50df5 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -237,6 +237,11 @@ config COMPACTION linux-mm@kvack.org. # +# support for unused page reporting +config PAGE_REPORTING + bool + +# # support for page migration # config MIGRATION diff --git a/mm/Makefile b/mm/Makefile index d996846697ef..fc4fa17b6c83 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -107,3 +107,4 @@ obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o obj-$(CONFIG_ZONE_DEVICE) += memremap.o obj-$(CONFIG_HMM_MIRROR) += hmm.o obj-$(CONFIG_MEMFD_CREATE) += memfd.o +obj-$(CONFIG_PAGE_REPORTING) += page_reporting.o diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 49f7bf91c25a..cb71a7190682 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1613,6 +1613,7 @@ static int __ref __offline_pages(unsigned long start_pfn, if (!populated_zone(zone)) { zone_pcp_reset(zone); build_all_zonelists(NULL); + page_reporting_reset(zone); } else zone_pcp_update(zone); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f85dc1561b85..bb138f2bfc98 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -68,6 +68,7 @@ #include #include #include +#include #include #include @@ -916,7 +917,7 @@ static inline struct capture_control *task_capc(struct zone *zone) static inline void __free_one_page(struct page *page, unsigned long pfn, struct zone *zone, unsigned int order, - int migratetype) + int migratetype, bool reported) { struct capture_control *capc = task_capc(zone); unsigned long uninitialized_var(buddy_pfn); @@ -991,11 +992,20 @@ static inline void __free_one_page(struct page *page, done_merging: set_page_order(page, order); - if (is_shuffle_order(order) ? shuffle_pick_tail() : - buddy_merge_likely(pfn, buddy_pfn, page, order)) + if (reported || + (is_shuffle_order(order) ? shuffle_pick_tail() : + buddy_merge_likely(pfn, buddy_pfn, page, order))) add_to_free_list_tail(page, zone, order, migratetype); else add_to_free_list(page, zone, order, migratetype); + + /* + * No need to notify on a reported page as the total count of + * unreported pages will not have increased since we have essentially + * merged the reported page with one or more unreported pages. + */ + if (!reported) + page_reporting_notify_free(zone, order); } /* @@ -1306,7 +1316,7 @@ static void free_pcppages_bulk(struct zone *zone, int count, if (unlikely(isolated_pageblocks)) mt = get_pageblock_migratetype(page); - __free_one_page(page, page_to_pfn(page), zone, 0, mt); + __free_one_page(page, page_to_pfn(page), zone, 0, mt, false); trace_mm_page_pcpu_drain(page, 0, mt); } spin_unlock(&zone->lock); @@ -1322,7 +1332,7 @@ static void free_one_page(struct zone *zone, is_migrate_isolate(migratetype))) { migratetype = get_pfnblock_migratetype(page, pfn); } - __free_one_page(page, pfn, zone, order, migratetype); + __free_one_page(page, pfn, zone, order, migratetype, false); spin_unlock(&zone->lock); } @@ -2184,6 +2194,100 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, return NULL; } +#ifdef CONFIG_PAGE_REPORTING +/** + * free_reported_page - Return a now-reported page back where we got it + * @page: Page that was reported + * + * This function will pull the migratetype and order information out + * of the page and attempt to return it where it found it. If the page + * is added to the free list without changes we will mark it as being + * reported. + */ +void free_reported_page(struct page *page, unsigned int order) +{ + struct zone *zone = page_zone(page); + unsigned long pfn; + unsigned int mt; + + /* zone lock should be held when this function is called */ + lockdep_assert_held(&zone->lock); + + pfn = page_to_pfn(page); + mt = get_pfnblock_migratetype(page, pfn); + __free_one_page(page, pfn, zone, order, mt, true); + + /* + * If page was not comingled with another page we can consider + * the result to be "reported" since part of the page hasn't been + * modified, otherwise we would need to report on the new larger + * page. + */ + if (PageBuddy(page) && page_order(page) == order) + add_page_to_reported_list(page, zone, order, mt); +} + +/** + * get_unreported_page - Pull an unreported page from the free_list + * @zone: Zone to draw pages from + * @order: Order to draw pages from + * @mt: Migratetype to draw pages from + * + * This function will obtain a page from the free list. It will start by + * attempting to pull from the tail of the free list and if that is already + * reported on it will instead pull the head if that is unreported. + * + * The page will have the migrate type and order stored in the page + * metadata. While being processed the page will not be avaialble for + * allocation. + * + * Return: page pointer if raw page found, otherwise NULL + */ +struct page *get_unreported_page(struct zone *zone, unsigned int order, int mt) +{ + struct list_head *tail = get_unreported_tail(zone, order, mt); + struct free_area *area = &(zone->free_area[order]); + struct list_head *list = &area->free_list[mt]; + struct page *page; + + /* zone lock should be held when this function is called */ + lockdep_assert_held(&zone->lock); + + /* Find a page of the appropriate size in the preferred list */ + page = list_last_entry(tail, struct page, lru); + list_for_each_entry_from_reverse(page, list, lru) { + /* If we entered this loop then the "raw" list isn't empty */ + + /* If the page is reported try the head of the list */ + if (PageReported(page)) { + page = list_first_entry(list, struct page, lru); + + /* + * If both the head and tail are reported then reset + * the boundary so that we read as an empty list + * next time and bail out. + */ + if (PageReported(page)) { + page_reporting_add_to_boundary(page, zone, mt); + break; + } + } + + del_page_from_free_list(page, zone, order); + + /* + * Page will not be available for allocation while we are + * processing it so update the freepage state. + */ + __mod_zone_freepage_state(zone, -(1 << order), mt); + + return page; + } + + return NULL; +} +#endif /* CONFIG_PAGE_REPORTING */ + /* * This array describes the order lists are fallen back to when * the free lists for the desirable migrate type are depleted diff --git a/mm/page_reporting.c b/mm/page_reporting.c new file mode 100644 index 000000000000..35c0fe4c4471 --- /dev/null +++ b/mm/page_reporting.c @@ -0,0 +1,340 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include "internal.h" + +static struct page_reporting_dev_info __rcu *ph_dev_info __read_mostly; + +struct list_head *boundary[MAX_ORDER - PAGE_REPORTING_MIN_ORDER][MIGRATE_TYPES]; + +static void page_reporting_reset_boundary(struct zone *zone, unsigned int order, + unsigned int migratetype) +{ + boundary[order - PAGE_REPORTING_MIN_ORDER][migratetype] = + &zone->free_area[order].free_list[migratetype]; +} + +#define for_each_reporting_migratetype_order(_order, _type) \ + for (_order = MAX_ORDER; _order-- != PAGE_REPORTING_MIN_ORDER;) \ + for (_type = MIGRATE_TYPES; _type--;) \ + if (!is_migrate_isolate(_type)) + +static int page_reporting_populate_metadata(struct zone *zone) +{ + unsigned int order, mt; + + /* + * We need to make sure we have somewhere to store the tracking + * data for how many reported pages are in the zone. To do that + * we need to make certain zone->reported_pages is populated. + */ + if (!zone->reported_pages) { + zone->reported_pages = + kcalloc(MAX_ORDER - PAGE_REPORTING_MIN_ORDER, + sizeof(unsigned long), + GFP_KERNEL); + if (!zone->reported_pages) + return -ENOMEM; + } + + /* Update boundary data to reflect the zone we are currently working */ + for_each_reporting_migratetype_order(order, mt) + page_reporting_reset_boundary(zone, order, mt); + + return 0; +} + +struct list_head *__page_reporting_get_boundary(unsigned int order, + int migratetype) +{ + return boundary[order - PAGE_REPORTING_MIN_ORDER][migratetype]; +} + +void page_reporting_del_from_boundary(struct page *page, struct zone *zone) +{ + unsigned int order = page_private(page) - PAGE_REPORTING_MIN_ORDER; + int mt = get_pcppage_migratetype(page); + struct list_head **tail = &boundary[order][mt]; + + if (*tail == &page->lru) + *tail = page->lru.next; +} + +void page_reporting_add_to_boundary(struct page *page, struct zone *zone, + int migratetype) +{ + unsigned int order = page_private(page) - PAGE_REPORTING_MIN_ORDER; + + boundary[order][migratetype] = &page->lru; + set_pcppage_migratetype(page, migratetype); +} + +void page_reporting_move_to_boundary(struct page *page, struct zone *zone, + int dest_mt) +{ + unsigned int order = page_private(page) - PAGE_REPORTING_MIN_ORDER; + + /* + * We essentially have two options available to us. The first is to + * move the page from the boundary list on one migratetype to the + * list for the new migratetype assuming reporting is still active. + * + * The other option is to clear the reported state of the page as + * we will not be adding it to the group of pages that were already + * reported. It is cheaper to just rereport such pages then go + * through and do a special search to skip over them. + */ + if (test_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags)) { + int src_mt = get_pcppage_migratetype(page); + struct list_head **tail = &boundary[order][src_mt]; + + if (*tail == &page->lru) + *tail = page->lru.next; + + boundary[order][dest_mt] = &page->lru; + set_pcppage_migratetype(page, dest_mt); + } else if (!is_migrate_isolate(dest_mt)) { + zone->reported_pages[order]--; + __ClearPageReported(page); + } +} + +static unsigned int page_reporting_fill(struct zone *zone, + struct page_reporting_dev_info *phdev) +{ + struct scatterlist *sg = phdev->sg; + unsigned int order, mt, count = 0; + + sg_init_table(phdev->sg, phdev->capacity); + + for_each_reporting_migratetype_order(order, mt) { + struct page *page; + + /* + * Pull pages from free list until we have drained + * it or we have reached capacity. + */ + while ((page = get_unreported_page(zone, order, mt))) { + sg_set_page(&sg[count], page, PAGE_SIZE << order, 0); + + if (++count == phdev->capacity) + return count; + } + } + + /* mark end of scatterlist due to underflow */ + if (count) + sg_mark_end(&sg[count - 1]); + + /* + * If there are no longer enough free pages to fully populate + * the scatterlist, then we can just shut it down for this zone. + */ + __clear_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags); + atomic_dec(&phdev->refcnt); + + return count; +} + +static void page_reporting_drain(struct page_reporting_dev_info *phdev) +{ + struct scatterlist *sg = phdev->sg; + + /* + * Drain the now reported pages back into their respective + * free lists/areas. We assume at least one page is populated. + */ + do { + free_reported_page(sg_page(sg), get_order(sg->length)); + } while (!sg_is_last(sg++)); +} + +/* + * The page reporting cycle consists of 4 stages, fill, report, drain, and idle. + * We will cycle through the first 3 stages until we fail to obtain any + * pages, in that case we will switch to idle. + */ +static void page_reporting_cycle(struct zone *zone, + struct page_reporting_dev_info *phdev) +{ + /* + * Guarantee boundaries and stats are populated before we + * start placing reported pages in the zone. + */ + if (page_reporting_populate_metadata(zone)) + return; + + spin_lock_irq(&zone->lock); + + /* set bit indicating boundaries are present */ + __set_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags); + + do { + /* Pull pages out of allocator into a scaterlist */ + unsigned int nents = page_reporting_fill(zone, phdev); + + /* no pages were acquired, give up */ + if (!nents) + break; + + spin_unlock_irq(&zone->lock); + + /* begin processing pages in local list */ + phdev->report(phdev, nents); + + spin_lock_irq(&zone->lock); + + /* + * We should have a scatterlist of pages that have been + * processed. Return them to their original free lists. + */ + page_reporting_drain(phdev); + + /* keep pulling pages till there are none to pull */ + } while (test_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags)); + + /* processing of the zone is complete, we can disable boundaries */ + __clear_bit(ZONE_PAGE_REPORTING_ACTIVE, &zone->flags); + + spin_unlock_irq(&zone->lock); +} + +static void page_reporting_process(struct work_struct *work) +{ + struct delayed_work *d_work = to_delayed_work(work); + struct page_reporting_dev_info *phdev = + container_of(d_work, struct page_reporting_dev_info, work); + struct zone *zone = first_online_pgdat()->node_zones; + + do { + if (test_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags)) + page_reporting_cycle(zone, phdev); + + /* Move to next zone, if at end of list start over */ + zone = next_zone(zone) ? : first_online_pgdat()->node_zones; + + /* + * As long as refcnt has not reached zero there are still + * zones to be processed. + */ + } while (atomic_read(&phdev->refcnt)); +} + +/* request page reporting on this zone */ +void __page_reporting_request(struct zone *zone) +{ + struct page_reporting_dev_info *phdev; + + rcu_read_lock(); + + /* + * We use RCU to protect the ph_dev_info pointer. In almost all + * cases this should be present, however in the unlikely case of + * a shutdown this will be NULL and we should exit. + */ + phdev = rcu_dereference(ph_dev_info); + if (unlikely(!phdev)) + goto out; + + /* + * We can use separate test and set operations here as there + * is nothing else that can set or clear this bit while we are + * holding the zone lock. The advantage to doing it this way is + * that we don't have to dirty the cacheline unless we are + * changing the value. + */ + __set_bit(ZONE_PAGE_REPORTING_REQUESTED, &zone->flags); + + /* + * Delay the start of work to allow a sizable queue to + * build. For now we are limiting this to running no more + * than 10 times per second. + */ + if (!atomic_fetch_inc(&phdev->refcnt)) + schedule_delayed_work(&phdev->work, HZ / 10); +out: + rcu_read_unlock(); +} + +void __page_reporting_free_stats(struct zone *zone) +{ + /* free reported_page statisitics */ + kfree(zone->reported_pages); + zone->reported_pages = NULL; +} + +static DEFINE_MUTEX(page_reporting_mutex); +DEFINE_STATIC_KEY_FALSE(page_reporting_notify_enabled); + +void page_reporting_shutdown(struct page_reporting_dev_info *phdev) +{ + mutex_lock(&page_reporting_mutex); + + if (rcu_access_pointer(ph_dev_info) == phdev) { + /* Disable page reporting notification */ + static_branch_disable(&page_reporting_notify_enabled); + RCU_INIT_POINTER(ph_dev_info, NULL); + synchronize_rcu(); + + /* Flush any existing work, and lock it out */ + cancel_delayed_work_sync(&phdev->work); + + /* Free scatterlist */ + kfree(phdev->sg); + phdev->sg = NULL; + } + + mutex_unlock(&page_reporting_mutex); +} +EXPORT_SYMBOL_GPL(page_reporting_shutdown); + +int page_reporting_startup(struct page_reporting_dev_info *phdev) +{ + struct zone *zone; + int err = 0; + + /* No point in enabling this if it cannot handle any pages */ + if (!phdev->capacity) + return -EINVAL; + + mutex_lock(&page_reporting_mutex); + + /* nothing to do if already in use */ + if (rcu_access_pointer(ph_dev_info)) { + err = -EBUSY; + goto err_out; + } + + /* allocate scatterlist to store pages being reported on */ + phdev->sg = kcalloc(phdev->capacity, sizeof(*phdev->sg), GFP_KERNEL); + if (!phdev->sg) { + err = -ENOMEM; + goto err_out; + } + + /* initialize refcnt and work structures */ + atomic_set(&phdev->refcnt, 0); + INIT_DELAYED_WORK(&phdev->work, &page_reporting_process); + + /* assign device, and begin initial flush of populated zones */ + rcu_assign_pointer(ph_dev_info, phdev); + for_each_populated_zone(zone) { + spin_lock_irq(&zone->lock); + __page_reporting_request(zone); + spin_unlock_irq(&zone->lock); + } + + /* enable page reporting notification */ + static_branch_enable(&page_reporting_notify_enabled); +err_out: + mutex_unlock(&page_reporting_mutex); + + return err; +} +EXPORT_SYMBOL_GPL(page_reporting_startup); From patchwork Fri Sep 6 14:53:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11135479 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 108C61395 for ; Fri, 6 Sep 2019 14:54:04 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D0FDC2082C for ; Fri, 6 Sep 2019 14:54:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="bPPkGTOw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D0FDC2082C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7C1C96B0010; Fri, 6 Sep 2019 10:54:02 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 771986B0266; Fri, 6 Sep 2019 10:54:02 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 687906B0269; Fri, 6 Sep 2019 10:54:02 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0172.hostedemail.com [216.40.44.172]) by kanga.kvack.org (Postfix) with ESMTP id 473876B0010 for ; Fri, 6 Sep 2019 10:54:02 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id CEB3F441E for ; Fri, 6 Sep 2019 14:54:01 +0000 (UTC) X-FDA: 75904790682.10.music96_5d555945d4727 X-Spam-Summary: 2,0,0,8f997a436466fb80,d41d8cd98f00b204,alexander.duyck@gmail.com,:nitesh@redhat.com:kvm@vger.kernel.org:mst@redhat.com:david@redhat.com:dave.hansen@intel.com:linux-kernel@vger.kernel.org:willy@infradead.org:mhocko@kernel.org::akpm@linux-foundation.org:virtio-dev@lists.oasis-open.org:osalvador@suse.de:yang.zhang.wz@gmail.com:pagupta@redhat.com:riel@surriel.com:konrad.wilk@oracle.com:lcapitulino@redhat.com:wei.w.wang@intel.com:aarcange@redhat.com:pbonzini@redhat.com:dan.j.williams@intel.com:alexander.h.duyck@linux.intel.com,RULES_HIT:41:152:355:379:960:965:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1542:1593:1594:1711:1730:1747:1777:1792:2196:2199:2393:2559:2562:2693:2898:3138:3139:3140:3141:3142:3353:3865:3866:3867:3868:3870:3871:3872:3874:4321:4385:4390:4395:4605:5007:6261:6653:6737:7576:9413:10004:10400:11026:11473:11658:11914:12043:12048:12294:12296:12297:12438:12517:12519:12555:12679:12760:13255:13972:14096:14097:14181 :14394:1 X-HE-Tag: music96_5d555945d4727 X-Filterd-Recvd-Size: 5922 Received: from mail-pg1-f194.google.com (mail-pg1-f194.google.com [209.85.215.194]) by imf29.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 14:54:01 +0000 (UTC) Received: by mail-pg1-f194.google.com with SMTP id n4so3652223pgv.2 for ; Fri, 06 Sep 2019 07:54:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=AHQp5tHq/YPoexLkCIK7ZDm0IJf6l4a1w2EjvR3aV6g=; b=bPPkGTOwMShliBXTYkGU+Y7gS2k5f6GuxSKDdDImp0r+6cm/SGw3Z9il2cozNyQD4A rrkMvw01sUNMbTaCgO5v7bidEsODr7WobPfVj2CFPf+LowvEF739obAgFrhzani+HO0Z oUqRc/ypQrZW5Lxjrh3ZWHvNqSYVUwnVnAosL50TJ8FPneWm2NcmF7TMO8Anh0nFWxKX lBT8bPCfp4GIbfcPizDQzQcJScX2zMMK5yCNv4i4+ziVXOSB84HVTPXfrk0ErxLhZ/jA xYTRQFQXm2n7IADPk928Uk39UhO6FsNvDgDiZglUYhH+fRDAoZyHgmBZjyeECQNZD7At CMVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=AHQp5tHq/YPoexLkCIK7ZDm0IJf6l4a1w2EjvR3aV6g=; b=cnvM0xvIGgGzTotKCY+PVdd5aRzhEZlD9S43MHC1krdwxEGKdQEn5Ho2LtPddXXj/4 oyiPUXAgLyty+oeQr5MFurLI2v8xa/ki3OEGHCeymqmOKCaS2kYt6EhHjvKqom7ShQIy Zzn2q9BgSJSYoS7zG/Jl5wEkp47pw5hve7F/hSoy6F79VJDaBOlVf48K0ny6gSw+53Pm p/e9k7/BhtzCHEMLFgnL3Wbi6zTjopoGwgKwLRb70rU2i9wXrlPDOYTmjrV5/aOPKl8r MCtm1XCIkTnDYZp/EB7YQz6ttIoaYJibYlyDd/yFTEzXP5ARxK12g7TSnC9D3Q1s2VVL z2Lw== X-Gm-Message-State: APjAAAUc6YM05rpCBpx3qQyzJQGJ7pbZ65KgErIeiXN6PyjiOFUsxSbp k1eCbQkrWAq5Nh7/ZwRbRGA= X-Google-Smtp-Source: APXvYqyR88QaZW39OsZnSfUJNlZNz+FucCLSQWJ+wyogMMJFeT5wM5gYNUWyTeVyXc2YZ1Dse/fCOQ== X-Received: by 2002:a62:2603:: with SMTP id m3mr11436590pfm.163.1567781640326; Fri, 06 Sep 2019 07:54:00 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id z4sm5219331pgp.80.2019.09.06.07.53.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Sep 2019 07:53:59 -0700 (PDT) Subject: [PATCH v8 6/7] virtio-balloon: Pull page poisoning config out of free page hinting From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Fri, 06 Sep 2019 07:53:58 -0700 Message-ID: <20190906145358.32552.1155.stgit@localhost.localdomain> In-Reply-To: <20190906145213.32552.30160.stgit@localhost.localdomain> References: <20190906145213.32552.30160.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Alexander Duyck Currently the page poisoning setting wasn't being enabled unless free page hinting was enabled. However we will need the page poisoning tracking logic as well for unused page reporting. As such pull it out and make it a separate bit of config in the probe function. In addition we can actually wrap the code in a check for NO_SANITY. If we don't care what is actually in the page we can just default to 0 and leave it there. Signed-off-by: Alexander Duyck --- drivers/virtio/virtio_balloon.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 226fbb995fb0..d2547df7de93 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -842,7 +842,6 @@ static int virtio_balloon_register_shrinker(struct virtio_balloon *vb) static int virtballoon_probe(struct virtio_device *vdev) { struct virtio_balloon *vb; - __u32 poison_val; int err; if (!vdev->config->get) { @@ -909,11 +908,18 @@ static int virtballoon_probe(struct virtio_device *vdev) VIRTIO_BALLOON_CMD_ID_STOP); spin_lock_init(&vb->free_page_list_lock); INIT_LIST_HEAD(&vb->free_page_list); - if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) { - memset(&poison_val, PAGE_POISON, sizeof(poison_val)); - virtio_cwrite(vb->vdev, struct virtio_balloon_config, - poison_val, &poison_val); - } + } + if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) { + __u32 poison_val; + + /* + * Let hypervisor know that we are expecting a specific + * value to be written back in unused pages. + */ + memset(&poison_val, PAGE_POISON, sizeof(poison_val)); + + virtio_cwrite(vb->vdev, struct virtio_balloon_config, + poison_val, &poison_val); } /* * We continue to use VIRTIO_BALLOON_F_DEFLATE_ON_OOM to decide if a @@ -1014,7 +1020,9 @@ static int virtballoon_restore(struct virtio_device *vdev) static int virtballoon_validate(struct virtio_device *vdev) { - if (!page_poisoning_enabled()) + /* Notify host if we care about poison value */ + if (IS_ENABLED(CONFIG_PAGE_POISONING_NO_SANITY) || + !page_poisoning_enabled()) __virtio_clear_bit(vdev, VIRTIO_BALLOON_F_PAGE_POISON); __virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM); From patchwork Fri Sep 6 14:54:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Duyck X-Patchwork-Id: 11135483 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7BB011395 for ; Fri, 6 Sep 2019 14:54:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2D4B12082C for ; Fri, 6 Sep 2019 14:54:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="TdjSwEO8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2D4B12082C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id DB5666B0266; Fri, 6 Sep 2019 10:54:08 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id D8C476B0269; Fri, 6 Sep 2019 10:54:08 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CA2B46B026A; Fri, 6 Sep 2019 10:54:08 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0053.hostedemail.com [216.40.44.53]) by kanga.kvack.org (Postfix) with ESMTP id AA7376B0266 for ; Fri, 6 Sep 2019 10:54:08 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 570F5824CA38 for ; Fri, 6 Sep 2019 14:54:08 +0000 (UTC) X-FDA: 75904790976.22.fowl58_5e3eb55c0823f X-Spam-Summary: 2,0,0,812fcf76754e0890,d41d8cd98f00b204,alexander.duyck@gmail.com,:nitesh@redhat.com:kvm@vger.kernel.org:mst@redhat.com:david@redhat.com:dave.hansen@intel.com:linux-kernel@vger.kernel.org:willy@infradead.org:mhocko@kernel.org::akpm@linux-foundation.org:virtio-dev@lists.oasis-open.org:osalvador@suse.de:yang.zhang.wz@gmail.com:pagupta@redhat.com:riel@surriel.com:konrad.wilk@oracle.com:lcapitulino@redhat.com:wei.w.wang@intel.com:aarcange@redhat.com:pbonzini@redhat.com:dan.j.williams@intel.com:alexander.h.duyck@linux.intel.com,RULES_HIT:1:2:41:152:355:379:960:966:968:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1593:1594:1605:1730:1747:1777:1792:2196:2198:2199:2200:2393:2559:2562:2693:2918:3138:3139:3140:3141:3142:3865:3866:3867:3868:3870:3871:3874:4049:4250:4321:4385:4605:5007:6119:6261:6653:6737:7576:7903:8603:9010:9413:10004:11026:11473:11658:11914:12043:12048:12291:12294:12296:12297:12438:12517:12519:12555:12679:12683:12760:12986:131 72:13221 X-HE-Tag: fowl58_5e3eb55c0823f X-Filterd-Recvd-Size: 10429 Received: from mail-pf1-f195.google.com (mail-pf1-f195.google.com [209.85.210.195]) by imf17.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Sep 2019 14:54:07 +0000 (UTC) Received: by mail-pf1-f195.google.com with SMTP id s12so4654470pfe.6 for ; Fri, 06 Sep 2019 07:54:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:date:message-id:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=Ec9PKUPnEp2nxFPq8uzj4M569SmUi9G5uEm08+INU8Q=; b=TdjSwEO8v1vu6/Vzrxhc1dLSYgEwnLjnBMqMgZtragfFX5sKvMqMFCQmFvk9OJU3CR zvdHvpf2R6a5X9d30f943GLO6B5hn+Swoo6yYmWoYDIrIO/bglPDgd54YvDptXg487w5 QdYO9+mmDAgryKtVLn05r1V2KzEDFtKTnRKBmxvaK+BRhueeD4UV4yZvK8cW719qKF20 Cpr2UZeXhIOB/1TV5QKDKG6T7O1E0Dc6o8q8wp3do7NF8sflFF5Bl/P1Op97WdvzFoR4 0DyqemCjHa2NGbcWTV+wGbYsaeEbbrFlmwK1iVpr4MHgGSSpwApX3GAMaHEY25XYwR+/ bAwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=Ec9PKUPnEp2nxFPq8uzj4M569SmUi9G5uEm08+INU8Q=; b=ep554OpDrd30mryXDFlZPzhrqBwB3NI5Mt3f3TjqqJmlOmtklnwPi4n8enBafUYVld oXMMUMLBsHM63RPdccVpd0bOWyYLky//BO3lOnLWTfhKrmjwmBvaWA3I68ILha2NeEjq pFJQtGI3kcsC8E1RrXD+TgCxBSXsimuaKPPbo28DL+4XHcRnvrJ8BrSLdjhd8a5FSVI0 LFgfgDyVrMICRQBe1tAe9sP+dRjjqMhuV366B3CdxQQvctCF9vHOnakQz31z0ALPsiga ld4+CHo/Mes5wEJN25exKwJr+iOI79F3BlcjRkXk7ffECd2Mn6K0JA3U0jbZYgZTDKop WlbQ== X-Gm-Message-State: APjAAAUmB5vbTTGOgYS6qdeso10tqW3cPc0rEsBqNugnnmnOJA8kfWFo FzdjB4O6ybKCqzaWQ8o7plI= X-Google-Smtp-Source: APXvYqyXlqk4FhEZbNG1KzGeAum/r8eE1G1PgLEAuwM5/3AAUp83BXsTMUBp3hH1nNvYPrjZOdzg5Q== X-Received: by 2002:a17:90a:24a8:: with SMTP id i37mr10100736pje.123.1567781646497; Fri, 06 Sep 2019 07:54:06 -0700 (PDT) Received: from localhost.localdomain ([2001:470:b:9c3:9e5c:8eff:fe4f:f2d0]) by smtp.gmail.com with ESMTPSA id a186sm5436928pge.0.2019.09.06.07.54.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Sep 2019 07:54:06 -0700 (PDT) Subject: [PATCH v8 7/7] virtio-balloon: Add support for providing unused page reports to host From: Alexander Duyck To: nitesh@redhat.com, kvm@vger.kernel.org, mst@redhat.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, virtio-dev@lists.oasis-open.org, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, riel@surriel.com, konrad.wilk@oracle.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, alexander.h.duyck@linux.intel.com Date: Fri, 06 Sep 2019 07:54:05 -0700 Message-ID: <20190906145405.32552.84088.stgit@localhost.localdomain> In-Reply-To: <20190906145213.32552.30160.stgit@localhost.localdomain> References: <20190906145213.32552.30160.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Alexander Duyck Add support for the page reporting feature provided by virtio-balloon. Reporting differs from the regular balloon functionality in that is is much less durable than a standard memory balloon. Instead of creating a list of pages that cannot be accessed the pages are only inaccessible while they are being indicated to the virtio interface. Once the interface has acknowledged them they are placed back into their respective free lists and are once again accessible by the guest system. Signed-off-by: Alexander Duyck --- drivers/virtio/Kconfig | 1 + drivers/virtio/virtio_balloon.c | 65 +++++++++++++++++++++++++++++++++++ include/uapi/linux/virtio_balloon.h | 1 + 3 files changed, 67 insertions(+) diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index 078615cf2afc..4b2dd8259ff5 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -58,6 +58,7 @@ config VIRTIO_BALLOON tristate "Virtio balloon driver" depends on VIRTIO select MEMORY_BALLOON + select PAGE_REPORTING ---help--- This driver supports increasing and decreasing the amount of memory within a KVM guest. diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index d2547df7de93..62bdb0afd022 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -19,6 +19,7 @@ #include #include #include +#include /* * Balloon device works in 4K page units. So each page is pointed to by @@ -37,6 +38,9 @@ #define VIRTIO_BALLOON_FREE_PAGE_SIZE \ (1 << (VIRTIO_BALLOON_FREE_PAGE_ORDER + PAGE_SHIFT)) +/* limit on the number of pages that can be on the reporting vq */ +#define VIRTIO_BALLOON_VRING_HINTS_MAX 16 + #ifdef CONFIG_BALLOON_COMPACTION static struct vfsmount *balloon_mnt; #endif @@ -46,6 +50,7 @@ enum virtio_balloon_vq { VIRTIO_BALLOON_VQ_DEFLATE, VIRTIO_BALLOON_VQ_STATS, VIRTIO_BALLOON_VQ_FREE_PAGE, + VIRTIO_BALLOON_VQ_REPORTING, VIRTIO_BALLOON_VQ_MAX }; @@ -113,6 +118,10 @@ struct virtio_balloon { /* To register a shrinker to shrink memory upon memory pressure */ struct shrinker shrinker; + + /* Unused page reporting device */ + struct virtqueue *reporting_vq; + struct page_reporting_dev_info ph_dev_info; }; static struct virtio_device_id id_table[] = { @@ -152,6 +161,32 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq) } +void virtballoon_unused_page_report(struct page_reporting_dev_info *ph_dev_info, + unsigned int nents) +{ + struct virtio_balloon *vb = + container_of(ph_dev_info, struct virtio_balloon, ph_dev_info); + struct virtqueue *vq = vb->reporting_vq; + unsigned int unused, err; + + /* We should always be able to add these buffers to an empty queue. */ + err = virtqueue_add_inbuf(vq, ph_dev_info->sg, nents, vb, + GFP_NOWAIT | __GFP_NOWARN); + + /* + * In the extremely unlikely case that something has changed and we + * are able to trigger an error we will simply display a warning + * and exit without actually processing the pages. + */ + if (WARN_ON(err)) + return; + + virtqueue_kick(vq); + + /* When host has read buffer, this completes via balloon_ack */ + wait_event(vb->acked, virtqueue_get_buf(vq, &unused)); +} + static void set_page_pfns(struct virtio_balloon *vb, __virtio32 pfns[], struct page *page) { @@ -476,6 +511,7 @@ static int init_vqs(struct virtio_balloon *vb) names[VIRTIO_BALLOON_VQ_DEFLATE] = "deflate"; names[VIRTIO_BALLOON_VQ_STATS] = NULL; names[VIRTIO_BALLOON_VQ_FREE_PAGE] = NULL; + names[VIRTIO_BALLOON_VQ_REPORTING] = NULL; if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { names[VIRTIO_BALLOON_VQ_STATS] = "stats"; @@ -487,11 +523,19 @@ static int init_vqs(struct virtio_balloon *vb) callbacks[VIRTIO_BALLOON_VQ_FREE_PAGE] = NULL; } + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { + names[VIRTIO_BALLOON_VQ_REPORTING] = "reporting_vq"; + callbacks[VIRTIO_BALLOON_VQ_REPORTING] = balloon_ack; + } + err = vb->vdev->config->find_vqs(vb->vdev, VIRTIO_BALLOON_VQ_MAX, vqs, callbacks, names, NULL, NULL); if (err) return err; + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) + vb->reporting_vq = vqs[VIRTIO_BALLOON_VQ_REPORTING]; + vb->inflate_vq = vqs[VIRTIO_BALLOON_VQ_INFLATE]; vb->deflate_vq = vqs[VIRTIO_BALLOON_VQ_DEFLATE]; if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { @@ -930,12 +974,30 @@ static int virtballoon_probe(struct virtio_device *vdev) if (err) goto out_del_balloon_wq; } + + vb->ph_dev_info.report = virtballoon_unused_page_report; + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) { + unsigned int capacity; + + capacity = min_t(unsigned int, + virtqueue_get_vring_size(vb->reporting_vq), + VIRTIO_BALLOON_VRING_HINTS_MAX); + vb->ph_dev_info.capacity = capacity; + + err = page_reporting_startup(&vb->ph_dev_info); + if (err) + goto out_unregister_shrinker; + } + virtio_device_ready(vdev); if (towards_target(vb)) virtballoon_changed(vdev); return 0; +out_unregister_shrinker: + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) + virtio_balloon_unregister_shrinker(vb); out_del_balloon_wq: if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) destroy_workqueue(vb->balloon_wq); @@ -964,6 +1026,8 @@ static void virtballoon_remove(struct virtio_device *vdev) { struct virtio_balloon *vb = vdev->priv; + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_REPORTING)) + page_reporting_shutdown(&vb->ph_dev_info); if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) virtio_balloon_unregister_shrinker(vb); spin_lock_irq(&vb->stop_update_lock); @@ -1035,6 +1099,7 @@ static int virtballoon_validate(struct virtio_device *vdev) VIRTIO_BALLOON_F_DEFLATE_ON_OOM, VIRTIO_BALLOON_F_FREE_PAGE_HINT, VIRTIO_BALLOON_F_PAGE_POISON, + VIRTIO_BALLOON_F_REPORTING, }; static struct virtio_driver virtio_balloon_driver = { diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h index a1966cd7b677..19974392d324 100644 --- a/include/uapi/linux/virtio_balloon.h +++ b/include/uapi/linux/virtio_balloon.h @@ -36,6 +36,7 @@ #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */ #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */ +#define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12