From patchwork Mon Aug 24 12:54:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Shi X-Patchwork-Id: 11733123 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 B76CB13B1 for ; Mon, 24 Aug 2020 12:55:40 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 84A072078D for ; Mon, 24 Aug 2020 12:55:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 84A072078D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 389B98D0005; Mon, 24 Aug 2020 08:55:28 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 2EE028D0001; Mon, 24 Aug 2020 08:55:28 -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 DE2818D0005; Mon, 24 Aug 2020 08:55:27 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0047.hostedemail.com [216.40.44.47]) by kanga.kvack.org (Postfix) with ESMTP id C0AA98D0001 for ; Mon, 24 Aug 2020 08:55:27 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 800D31EF2 for ; Mon, 24 Aug 2020 12:55:27 +0000 (UTC) X-FDA: 77185458294.24.tax27_0d0d41e27053 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id 596441A4A0 for ; Mon, 24 Aug 2020 12:55:27 +0000 (UTC) X-Spam-Summary: 1,0,0,8f9d349a29c5db89,d41d8cd98f00b204,alex.shi@linux.alibaba.com,,RULES_HIT:41:69:355:379:541:800:960:966:968:973:988:989:1260:1261:1345:1359:1381:1431:1437:1534:1543:1711:1730:1747:1777:1792:1801:2196:2199:2393:2559:2562:2898:3138:3139:3140:3141:3142:3353:3865:3866:3867:3868:3872:4385:4605:5007:6261:6737:6738:8957:9010:9121:9592:10004:11026:11473:11658:11914:12043:12048:12291:12296:12297:12438:12555:12683:12895:13161:13229:13846:14181:14394:14721:14915:21060:21080:21451:21627:21740:21987:30054:30070,0,RBL:115.124.30.54:@linux.alibaba.com:.lbl8.mailshell.net-62.20.2.100 64.201.201.201;04yg17qwgfbe6osxjtmu4g6wax56zop7rjrxoybf8a567uj1z5a7rs7rim33ru3.o1j1kzgyzefr8e6o7jquny4wp7qb5b5hwpb4cge4oh78tcpyd8emy9cba3adreh.a-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:none,Custom_rules:0:0:0,LFtime:26,LUA_SUMMARY:none X-HE-Tag: tax27_0d0d41e27053 X-Filterd-Recvd-Size: 4727 Received: from out30-54.freemail.mail.aliyun.com (out30-54.freemail.mail.aliyun.com [115.124.30.54]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Mon, 24 Aug 2020 12:55:25 +0000 (UTC) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R101e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e01355;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0U6k9-bl_1598273712; Received: from aliy80.localdomain(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0U6k9-bl_1598273712) by smtp.aliyun-inc.com(127.0.0.1); Mon, 24 Aug 2020 20:55:15 +0800 From: Alex Shi To: akpm@linux-foundation.org, mgorman@techsingularity.net, tj@kernel.org, hughd@google.com, khlebnikov@yandex-team.ru, daniel.m.jordan@oracle.com, willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, shakeelb@google.com, iamjoonsoo.kim@lge.com, richard.weiyang@gmail.com, kirill@shutemov.name, alexander.duyck@gmail.com, rong.a.chen@intel.com, mhocko@suse.com, vdavydov.dev@gmail.com, shy828301@gmail.com Subject: [PATCH v18 08/32] mm/vmscan: remove unnecessary lruvec adding Date: Mon, 24 Aug 2020 20:54:41 +0800 Message-Id: <1598273705-69124-9-git-send-email-alex.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1598273705-69124-1-git-send-email-alex.shi@linux.alibaba.com> References: <1598273705-69124-1-git-send-email-alex.shi@linux.alibaba.com> X-Rspamd-Queue-Id: 596441A4A0 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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: We don't have to add a freeable page into lru and then remove from it. This change saves a couple of actions and makes the moving more clear. The SetPageLRU needs to be kept before put_page_testzero for list intergrity, otherwise: #0 mave_pages_to_lru #1 release_pages if !put_page_testzero if (put_page_testzero()) !PageLRU //skip lru_lock SetPageLRU() list_add(&page->lru,) list_add(&page->lru,) [akpm@linux-foundation.org: coding style fixes] Signed-off-by: Alex Shi Cc: Andrew Morton Cc: Johannes Weiner Cc: Tejun Heo Cc: Matthew Wilcox Cc: Hugh Dickins Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/vmscan.c | 38 +++++++++++++++++++++++++------------- 1 file changed, 25 insertions(+), 13 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 99e1796eb833..ffccb94defaf 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1850,26 +1850,30 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec, while (!list_empty(list)) { page = lru_to_page(list); VM_BUG_ON_PAGE(PageLRU(page), page); + list_del(&page->lru); if (unlikely(!page_evictable(page))) { - list_del(&page->lru); spin_unlock_irq(&pgdat->lru_lock); putback_lru_page(page); spin_lock_irq(&pgdat->lru_lock); continue; } - lruvec = mem_cgroup_page_lruvec(page, pgdat); + /* + * The SetPageLRU needs to be kept here for list intergrity. + * Otherwise: + * #0 mave_pages_to_lru #1 release_pages + * if !put_page_testzero + * if (put_page_testzero()) + * !PageLRU //skip lru_lock + * SetPageLRU() + * list_add(&page->lru,) + * list_add(&page->lru,) + */ SetPageLRU(page); - lru = page_lru(page); - nr_pages = thp_nr_pages(page); - update_lru_size(lruvec, lru, page_zonenum(page), nr_pages); - list_move(&page->lru, &lruvec->lists[lru]); - - if (put_page_testzero(page)) { + if (unlikely(put_page_testzero(page))) { __ClearPageLRU(page); __ClearPageActive(page); - del_page_from_lru_list(page, lruvec, lru); if (unlikely(PageCompound(page))) { spin_unlock_irq(&pgdat->lru_lock); @@ -1877,11 +1881,19 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec, spin_lock_irq(&pgdat->lru_lock); } else list_add(&page->lru, &pages_to_free); - } else { - nr_moved += nr_pages; - if (PageActive(page)) - workingset_age_nonresident(lruvec, nr_pages); + + continue; } + + lruvec = mem_cgroup_page_lruvec(page, pgdat); + lru = page_lru(page); + nr_pages = thp_nr_pages(page); + + update_lru_size(lruvec, lru, page_zonenum(page), nr_pages); + list_add(&page->lru, &lruvec->lists[lru]); + nr_moved += nr_pages; + if (PageActive(page)) + workingset_age_nonresident(lruvec, nr_pages); } /*