From patchwork Thu Jun 11 06:16:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Shi X-Patchwork-Id: 11599275 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 C4CE3912 for ; Thu, 11 Jun 2020 06:17:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 90AFD2075F for ; Thu, 11 Jun 2020 06:17:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90AFD2075F 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 E59138D0085; Thu, 11 Jun 2020 02:17:20 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id E31128D0084; Thu, 11 Jun 2020 02:17:20 -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 CAAF58D0085; Thu, 11 Jun 2020 02:17:20 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0221.hostedemail.com [216.40.44.221]) by kanga.kvack.org (Postfix) with ESMTP id AA5B58D0083 for ; Thu, 11 Jun 2020 02:17:20 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 7EC6780186EA for ; Thu, 11 Jun 2020 06:17:20 +0000 (UTC) X-FDA: 76915923840.17.fork08_190064626dd1 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 59A06180CF7F7 for ; Thu, 11 Jun 2020 06:17:20 +0000 (UTC) X-Spam-Summary: 2,0,0,19ff7291d897d04e,d41d8cd98f00b204,alex.shi@linux.alibaba.com,,RULES_HIT:41:355:379:541:800:960:973:988:989:1260:1261:1345:1359:1381:1431:1437:1534:1541:1711:1730:1747:1777:1792:2194:2199:2393:2559:2562:3138:3139:3140:3141:3142:3352:3865:3867:3871:3874:5007:6119:6261:6737:7903:10004:11026:11658:11914:12043:12048:12297:12438:12555:12895:13069:13311:13357:13846:14096:14181:14384:14394:14721:14915:21060:21080:21451:21627:21990:30054:30070,0,RBL:115.124.30.56:@linux.alibaba.com:.lbl8.mailshell.net-64.201.201.201 62.20.2.100,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:23,LUA_SUMMARY:none X-HE-Tag: fork08_190064626dd1 X-Filterd-Recvd-Size: 2665 Received: from out30-56.freemail.mail.aliyun.com (out30-56.freemail.mail.aliyun.com [115.124.30.56]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Thu, 11 Jun 2020 06:17:19 +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=e01e07425;MF=alex.shi@linux.alibaba.com;NM=1;PH=DS;RN=16;SR=0;TI=SMTPD_---0U.FIUkw_1591856225; Received: from localhost(mailfrom:alex.shi@linux.alibaba.com fp:SMTPD_---0U.FIUkw_1591856225) by smtp.aliyun-inc.com(127.0.0.1); Thu, 11 Jun 2020 14:17:05 +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, yang.shi@linux.alibaba.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 Subject: [PATCH v12 02/16] mm/page_idle: no unlikely double check for idle page counting Date: Thu, 11 Jun 2020 14:16:35 +0800 Message-Id: <1591856209-166869-3-git-send-email-alex.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1591856209-166869-1-git-send-email-alex.shi@linux.alibaba.com> References: <1591856209-166869-1-git-send-email-alex.shi@linux.alibaba.com> X-Rspamd-Queue-Id: 59A06180CF7F7 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: As func comments mentioned, few isolated page missing be tolerated. So why not do further to drop the unlikely double check. That won't cause more idle pages, but reduce a lock contention. This is also a preparation for later new page isolation feature. Signed-off-by: Alex Shi Cc: Andrew Morton Cc: Johannes Weiner Cc: Matthew Wilcox Cc: Hugh Dickins Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/page_idle.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/mm/page_idle.c b/mm/page_idle.c index 057c61df12db..5fdd753e151a 100644 --- a/mm/page_idle.c +++ b/mm/page_idle.c @@ -32,19 +32,11 @@ static struct page *page_idle_get_page(unsigned long pfn) { struct page *page = pfn_to_online_page(pfn); - pg_data_t *pgdat; if (!page || !PageLRU(page) || !get_page_unless_zero(page)) return NULL; - pgdat = page_pgdat(page); - spin_lock_irq(&pgdat->lru_lock); - if (unlikely(!PageLRU(page))) { - put_page(page); - page = NULL; - } - spin_unlock_irq(&pgdat->lru_lock); return page; }