From patchwork Wed Dec 19 03:40:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Aneesh Kumar K.V" X-Patchwork-Id: 10736745 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6BDCA13AD for ; Wed, 19 Dec 2018 03:41:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 56F2C2B250 for ; Wed, 19 Dec 2018 03:41:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 481352B254; Wed, 19 Dec 2018 03:41:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 95A5B2B250 for ; Wed, 19 Dec 2018 03:41:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BE82B8E000B; Tue, 18 Dec 2018 22:41:11 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id B94E28E0001; Tue, 18 Dec 2018 22:41:11 -0500 (EST) 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 A39BC8E000B; Tue, 18 Dec 2018 22:41:11 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-pf1-f197.google.com (mail-pf1-f197.google.com [209.85.210.197]) by kanga.kvack.org (Postfix) with ESMTP id 61B9E8E0001 for ; Tue, 18 Dec 2018 22:41:11 -0500 (EST) Received: by mail-pf1-f197.google.com with SMTP id p9so17173723pfj.3 for ; Tue, 18 Dec 2018 19:41:11 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:in-reply-to:references:mime-version :content-transfer-encoding:message-id; bh=P1NA0nk9Pwa5wvQbAWimQAbqDK+Z/JgAqRHXoUNMgw8=; b=PMXX6Xce3N/GiqB3R57iW/T3v4/6CUC2kLnPP2LgsdLRyu3qCk1Qz2tgfNISbfZVky uGzJoY6TrINZgDavCSY4oalfPAsrsvYL9NB/jDiu403BrKM2wtBd33V2DKcOXtNyL6pe 8MYKDFlMwRB9dibry6kW4F3whzpsOz5QbUw6fNFCeUTc0KIkYEcd/Gip1YQEkDo/gXyh yZme796MiJk7g1fMIQPDUEjn062kId7Cz+sfwEbfTo7i2AlZtcdGeUdfIYnCopca1OX4 +fyPKJtunKOHQbN5yKcYKgXaSVLh1WUbplRU4edVUPMd3CgZLiP1TYMGuJoVhp8JjbN6 S+XQ== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of aneesh.kumar@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=aneesh.kumar@linux.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com X-Gm-Message-State: AA+aEWbMiHGyQY+DqAN60enbyb4QHScIIx8Z8e6oN0hSD9qZUzdeQetP LuJl8scdfb/GNkh80XhBumkEB7BiB5MpTgbp/81vpIaEj87EllxXJLo1/r46Cjg3m2JWujV0Py2 d3lDy1+WK/Ag4DA/46djAUfFBInwBPdDw0EqkLky2uHUZu/+SzJTRU6RIXlio5hmdXQ== X-Received: by 2002:a17:902:bc3:: with SMTP id 61mr18938172plr.15.1545190871045; Tue, 18 Dec 2018 19:41:11 -0800 (PST) X-Google-Smtp-Source: AFSGD/WXSRMdIjoU00hUbj9V04ehdB6aDsRu4/e4h+89XkqYT0IDA/UlGFfEEeeFnImjhAhsH+9I X-Received: by 2002:a17:902:bc3:: with SMTP id 61mr18938123plr.15.1545190869471; Tue, 18 Dec 2018 19:41:09 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1545190869; cv=none; d=google.com; s=arc-20160816; b=y15mJwbYDpAM/4T9lMlD5RGR0Mauwrw26cfC0ZDQI2mx2bKUFduIWbvyz7vudaqRvu few8hU7NoXaBzORqZImSs7TuhGh+2IJa+orw3srRYxTetq8xj9exIKc71dCW7nHiPo0g QwyWBjx9akMwJfpzKEQSDTkGtf69jWs6nBV3I0pz52lK+xRdJyI2YAAHNOoeTObnD5dp 2m4oERkypIgxhhE0RrPdYu+llqgefaMFMUNEPATjvGUqf9x+Y5L7MDCNNNyfXNEqSdze O9Y4deXF5wArU7cVKkdJlYojDd4D0vochH/FIM+AVwRLNFssm91Ck0KD83upPpX2D2BN Cp5w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:content-transfer-encoding:mime-version:references :in-reply-to:date:subject:cc:to:from; bh=P1NA0nk9Pwa5wvQbAWimQAbqDK+Z/JgAqRHXoUNMgw8=; b=IBCMLdV57HU1U6DBIaDUJbWYwUXTpsJWAQWLX4aGvQ/t2ChjwmFTSdITaYw1LTdOSP i2lzyWGQRtBISAL9jbJPaFlQYoDaStLcitetJygKuKdUA7ijz2AA2jkiO+9gUll7hIRV BoWfVNPY4sV9Zz/QO7I6qO4ukSSBz50ycWA6oJYhpAe+TDyr325v8uNZKRvTssQUoeVT hv7V0dxUGE7t3+Ie0Uh05OkkSrcwYyrDFIDSJhc7u4EONXvZHMfR0Ue0jkolwASQoAPm M/S5fyxgvvlq/Vynn+MpzKLHqWHZXI6a2cMg5wFQ0/6Z+GhQWRsH3FWyL7pPzGQ0sW6J DcBw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of aneesh.kumar@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=aneesh.kumar@linux.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com. [148.163.156.1]) by mx.google.com with ESMTPS id 2si15197562pfd.154.2018.12.18.19.41.09 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Dec 2018 19:41:09 -0800 (PST) Received-SPF: pass (google.com: domain of aneesh.kumar@linux.ibm.com designates 148.163.156.1 as permitted sender) client-ip=148.163.156.1; Authentication-Results: mx.google.com; spf=pass (google.com: domain of aneesh.kumar@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=aneesh.kumar@linux.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wBJ3dKVP063399 for ; Tue, 18 Dec 2018 22:41:08 -0500 Received: from e34.co.us.ibm.com (e34.co.us.ibm.com [32.97.110.152]) by mx0a-001b2d01.pphosted.com with ESMTP id 2pfb4e71ak-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 18 Dec 2018 22:41:08 -0500 Received: from localhost by e34.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 19 Dec 2018 03:41:07 -0000 Received: from b03cxnp08028.gho.boulder.ibm.com (9.17.130.20) by e34.co.us.ibm.com (192.168.1.134) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 19 Dec 2018 03:41:03 -0000 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wBJ3f2O511731048 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 19 Dec 2018 03:41:02 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1A9737806A; Wed, 19 Dec 2018 03:41:02 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 662BD78068; Wed, 19 Dec 2018 03:40:58 +0000 (GMT) Received: from skywalker.ibmuc.com (unknown [9.85.71.103]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 19 Dec 2018 03:40:58 +0000 (GMT) From: "Aneesh Kumar K.V" To: akpm@linux-foundation.org, Michal Hocko , Alexey Kardashevskiy , mpe@ellerman.id.au, paulus@samba.org, David Gibson Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, "Aneesh Kumar K.V" Subject: [PATCH V5 1/3] mm: Add get_user_pages_cma_migrate Date: Wed, 19 Dec 2018 09:10:45 +0530 X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181219034047.16305-1-aneesh.kumar@linux.ibm.com> References: <20181219034047.16305-1-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 18121903-0016-0000-0000-000009665F90 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010246; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000271; SDB=6.01133803; UDB=6.00589449; IPR=6.00913977; MB=3.00024741; MTD=3.00000008; XFM=3.00000015; UTC=2018-12-19 03:41:06 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18121903-0017-0000-0000-000041759891 Message-Id: <20181219034047.16305-2-aneesh.kumar@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-12-19_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812190029 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: X-Virus-Scanned: ClamAV using ClamSMTP This helper does a get_user_pages_fast and if it find pages in the CMA area it will try to migrate them before taking page reference. This makes sure that we don't keep non-movable pages (due to page reference count) in the CMA area. Not able to move pages out of CMA area result in CMA allocation failures. Signed-off-by: Aneesh Kumar K.V --- include/linux/hugetlb.h | 2 + include/linux/migrate.h | 3 + mm/hugetlb.c | 4 +- mm/migrate.c | 139 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 146 insertions(+), 2 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 087fd5f48c91..1eed0cdaec0e 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -371,6 +371,8 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask); struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma, unsigned long address); +struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask, + int nid, nodemask_t *nmask); int huge_add_to_page_cache(struct page *page, struct address_space *mapping, pgoff_t idx); diff --git a/include/linux/migrate.h b/include/linux/migrate.h index f2b4abbca55e..d82b35afd2eb 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -286,6 +286,9 @@ static inline int migrate_vma(const struct migrate_vma_ops *ops, } #endif /* IS_ENABLED(CONFIG_MIGRATE_VMA_HELPER) */ +extern int get_user_pages_cma_migrate(unsigned long start, int nr_pages, int write, + struct page **pages); + #endif /* CONFIG_MIGRATION */ #endif /* _LINUX_MIGRATE_H */ diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 7f2a28ab46d5..faf3102ae45e 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1585,8 +1585,8 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask, return page; } -static struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask, - int nid, nodemask_t *nmask) +struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask, + int nid, nodemask_t *nmask) { struct page *page; diff --git a/mm/migrate.c b/mm/migrate.c index f7e4bfdc13b7..d564558fba03 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2946,3 +2946,142 @@ int migrate_vma(const struct migrate_vma_ops *ops, } EXPORT_SYMBOL(migrate_vma); #endif /* defined(MIGRATE_VMA_HELPER) */ + +static struct page *new_non_cma_page(struct page *page, unsigned long private) +{ + /* + * We want to make sure we allocate the new page from the same node + * as the source page. + */ + int nid = page_to_nid(page); + /* + * Trying to allocate a page for migration. Ignore allocation + * failure warnings + */ + gfp_t gfp_mask = GFP_USER | __GFP_THISNODE | __GFP_NOWARN; + + if (PageHighMem(page)) + gfp_mask |= __GFP_HIGHMEM; + +#ifdef CONFIG_HUGETLB_PAGE + if (PageHuge(page)) { + struct hstate *h = page_hstate(page); + /* + * We don't want to dequeue from the pool because pool pages will + * mostly be from the CMA region. + */ + return alloc_migrate_huge_page(h, gfp_mask, nid, NULL); + } +#endif + if (PageTransHuge(page)) { + struct page *thp; + /* + * ignore allocation failure warnings + */ + gfp_t thp_gfpmask = GFP_TRANSHUGE | __GFP_THISNODE | __GFP_NOWARN; + + /* + * Remove the movable mask so that we don't allocate from + * CMA area again. + */ + thp_gfpmask &= ~__GFP_MOVABLE; + thp = __alloc_pages_node(nid, thp_gfpmask, HPAGE_PMD_ORDER); + if (!thp) + return NULL; + prep_transhuge_page(thp); + return thp; + } + + return __alloc_pages_node(nid, gfp_mask, 0); +} + +/** + * get_user_pages_cma_migrate() - pin user pages in memory by migrating pages in CMA region + * @start: starting user address + * @nr_pages: number of pages from start to pin + * @write: whether pages will be written to + * @pages: array that receives pointers to the pages pinned. + * Should be at least nr_pages long. + * + * Attempt to pin user pages in memory without taking mm->mmap_sem. + * If not successful, it will fall back to taking the lock and + * calling get_user_pages(). + * + * If the pinned pages are backed by CMA region, we migrate those pages out, + * allocating new pages from non-CMA region. This helps in avoiding keeping + * pages pinned in the CMA region for a long time thereby resulting in + * CMA allocation failures. + * + * Returns number of pages pinned. This may be fewer than the number + * requested. If nr_pages is 0 or negative, returns 0. If no pages + * were pinned, returns -errno. + */ + +int get_user_pages_cma_migrate(unsigned long start, int nr_pages, int write, + struct page **pages) +{ + int i, ret; + bool drain_allow = true; + bool migrate_allow = true; + LIST_HEAD(cma_page_list); + +get_user_again: + ret = get_user_pages_fast(start, nr_pages, write, pages); + if (ret <= 0) + return ret; + + for (i = 0; i < ret; ++i) { + /* + * If we get a page from the CMA zone, since we are going to + * be pinning these entries, we might as well move them out + * of the CMA zone if possible. + */ + if (is_migrate_cma_page(pages[i]) && migrate_allow) { + + struct page *head = compound_head(pages[i]); + + if (PageHuge(head)) + isolate_huge_page(head, &cma_page_list); + else { + if (!PageLRU(head) && drain_allow) { + lru_add_drain_all(); + drain_allow = false; + } + + if (!isolate_lru_page(head)) { + list_add_tail(&head->lru, &cma_page_list); + mod_node_page_state(page_pgdat(head), + NR_ISOLATED_ANON + + page_is_file_cache(head), + hpage_nr_pages(head)); + } + } + } + } + if (!list_empty(&cma_page_list)) { + /* + * drop the above get_user_pages reference. + */ + for (i = 0; i < ret; ++i) + put_page(pages[i]); + + if (migrate_pages(&cma_page_list, new_non_cma_page, + NULL, 0, MIGRATE_SYNC, MR_CONTIG_RANGE)) { + /* + * some of the pages failed migration. Do get_user_pages + * without migration. + */ + migrate_allow = false; + + if (!list_empty(&cma_page_list)) + putback_movable_pages(&cma_page_list); + } + /* + * We did migrate all the pages, Try to get the page references again + * migrating any new CMA pages which we failed to isolate earlier. + */ + drain_allow = true; + goto get_user_again; + } + return ret; +}