From patchwork Tue Oct 13 23:51:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 11836321 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 139EF921 for ; Tue, 13 Oct 2020 23:51:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C570F22228 for ; Tue, 13 Oct 2020 23:51:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="rmOq18sL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C570F22228 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8044B6B0089; Tue, 13 Oct 2020 19:51:27 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 7B4AC6B0093; Tue, 13 Oct 2020 19:51:27 -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 6CB5D900002; Tue, 13 Oct 2020 19:51:27 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0034.hostedemail.com [216.40.44.34]) by kanga.kvack.org (Postfix) with ESMTP id 40EBF6B0089 for ; Tue, 13 Oct 2020 19:51:27 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id D8FE73629 for ; Tue, 13 Oct 2020 23:51:26 +0000 (UTC) X-FDA: 77368551372.05.comb20_0f08e4027207 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id BF83A18016695 for ; Tue, 13 Oct 2020 23:51:26 +0000 (UTC) X-Spam-Summary: 1,0,0,1c1ff34fd6e40967,d41d8cd98f00b204,akpm@linux-foundation.org,,RULES_HIT:41:355:379:800:960:967:973:988:989:1260:1345:1359:1381:1431:1437:1534:1542:1711:1730:1747:1777:1792:2393:2525:2559:2564:2682:2685:2859:2898:2902:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3353:3865:3866:3867:3868:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4250:4321:5007:6119:6261:6653:6737:7514:7576:8784:9025:9036:9545:10004:11026:11473:11658:11914:12043:12048:12296:12297:12438:12517:12519:12555:12679:12986:13846:14096:14181:14721:21080:21324:21451:21627:21939:30054:30064:30070,0,RBL:198.145.29.99:@linux-foundation.org:.lbl8.mailshell.net-64.100.201.201 62.2.0.100;04ygjobd1wj7bmqfr74q8p6g9gehzypphatn3yjoqt3nzgpepkm5xn1tmaxask1.t188tykyz35tdpisz1ws7fjjcn6kpcas9yqez9w488aafwj8cpyijhtqfhde48n.h-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtim e:23,LUA X-HE-Tag: comb20_0f08e4027207 X-Filterd-Recvd-Size: 3683 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Tue, 13 Oct 2020 23:51:26 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 32E4D21D7A; Tue, 13 Oct 2020 23:51:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602633085; bh=bX7VzBOzh53KeWxHAEHq2ingEbvqR0h7IECo0hgmsos=; h=Date:From:To:Subject:In-Reply-To:From; b=rmOq18sL0cdiwXH/LXHVJt6eS1o6gn3hfwfA/lmWGeC4syeGdzAxletgmIkidPaNX QpBXy+Nt26OjYY9ZHquXj20zQOCtO12Tc6klOFxzlwtkbclqFQ8pbYZhA0PoBXqBpW 2YjpaRER7DXcVYJlRVYN8o/VxEbt7EokLValB5vA= Date: Tue, 13 Oct 2020 16:51:24 -0700 From: Andrew Morton To: adobriyan@gmail.com, akpm@linux-foundation.org, cai@redhat.com, chris@chris-wilson.co.uk, hannes@cmpxchg.org, hughd@google.com, jani.nikula@linux.intel.com, linux-mm@kvack.org, matthew.auld@intel.com, mm-commits@vger.kernel.org, torvalds@linux-foundation.org, william.kucharski@oracle.com, willy@infradead.org, ying.huang@intel.com Subject: [patch 056/181] mm: optimise madvise WILLNEED Message-ID: <20201013235124.9efI4nvew%akpm@linux-foundation.org> In-Reply-To: <20201013164658.3bfd96cc224d8923e66a9f4e@linux-foundation.org> User-Agent: s-nail v14.8.16 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: "Matthew Wilcox (Oracle)" Subject: mm: optimise madvise WILLNEED Instead of calling find_get_entry() for every page index, use an XArray iterator to skip over NULL entries, and avoid calling get_page(), because we only want the swap entries. [willy@infradead.org: fix LTP soft lockups] Link: https://lkml.kernel.org/r/20200914165032.GS6583@casper.infradead.org Link: https://lkml.kernel.org/r/20200910183318.20139-4-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Johannes Weiner Cc: Alexey Dobriyan Cc: Chris Wilson Cc: Huang Ying Cc: Hugh Dickins Cc: Jani Nikula Cc: Matthew Auld Cc: William Kucharski Cc: Qian Cai Signed-off-by: Andrew Morton --- mm/madvise.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) --- a/mm/madvise.c~mm-optimise-madvise-willneed +++ a/mm/madvise.c @@ -224,25 +224,28 @@ static void force_shm_swapin_readahead(s unsigned long start, unsigned long end, struct address_space *mapping) { - pgoff_t index; + XA_STATE(xas, &mapping->i_pages, linear_page_index(vma, start)); + pgoff_t end_index = end / PAGE_SIZE; struct page *page; - swp_entry_t swap; - for (; start < end; start += PAGE_SIZE) { - index = ((start - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; + rcu_read_lock(); + xas_for_each(&xas, page, end_index) { + swp_entry_t swap; - page = find_get_entry(mapping, index); - if (!xa_is_value(page)) { - if (page) - put_page(page); + if (!xa_is_value(page)) continue; - } + xas_pause(&xas); + rcu_read_unlock(); + swap = radix_to_swp_entry(page); page = read_swap_cache_async(swap, GFP_HIGHUSER_MOVABLE, NULL, 0, false); if (page) put_page(page); + + rcu_read_lock(); } + rcu_read_unlock(); lru_add_drain(); /* Push any new pages onto the LRU now */ }