From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1307C43381 for ; Tue, 19 Feb 2019 16:47:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 34EE421773 for ; Tue, 19 Feb 2019 16:47:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 34EE421773 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 C7C998E0003; Tue, 19 Feb 2019 11:47:11 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C04D98E0002; Tue, 19 Feb 2019 11:47:11 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AA5678E0003; Tue, 19 Feb 2019 11:47:11 -0500 (EST) 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 5DB8E8E0002 for ; Tue, 19 Feb 2019 11:47:11 -0500 (EST) Received: by mail-pf1-f197.google.com with SMTP id m3so16631177pfj.14 for ; Tue, 19 Feb 2019 08:47:11 -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:subject:to:cc :references:from:message-id:date:user-agent:mime-version:in-reply-to :content-transfer-encoding:content-language; bh=mUn5vdC4XGDDXJI+fhBTHcwjd41VIvEJMT4VM2uu0f4=; b=F4mmnLnB9SMeCP4uNhfhsm1G9JBHPstcZAwP7s4+TdctwDkYjWxE254iMdU65IE5b+ Ha79x0qxpKPR/R6V5PIIoUSPG8oHI5X+KtkKWU2I0/oB2Sr9aEfRn6qd3lMOQf+0MC3U RWJFu45v92VSX+NxqVJePOzwcScE9oTfm+9Bdxah6Hj8xMNkSw+QdCjHHnym8bN3G/EV eIkMsibVbPpNNncqZ4QjqksCKOtzNrpDC1oB59VvC5VjtDJAq6XwV0C//JIXbAyONaf4 AlZ23v2tkxzAmRtkeaTK6BwVaIUBxBK1XIfYXQj80dfAEQMyMU4HCMk3F7EgSF6nWFH+ uMsw== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of yang.shi@linux.alibaba.com designates 115.124.30.132 as permitted sender) smtp.mailfrom=yang.shi@linux.alibaba.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alibaba.com X-Gm-Message-State: AHQUAubF8XsaRKLn9egFRpzMOLN0xVafFmeXndGm+AVCvnlc+MzMuI1K HGn7b5XvGWxaJxOl4LzBhQZv4ER+KxuqMoehepAORSa7iGrjtdN/G0k9H6woz/QXBdeNz4n5QTf mtNVQBbETCx9UYp+TuLGInRndro9NngDJPorhTe8bSKUkC5/SPyGmVYAUjGRdtSbSpw== X-Received: by 2002:a63:f816:: with SMTP id n22mr24857160pgh.146.1550594831005; Tue, 19 Feb 2019 08:47:11 -0800 (PST) X-Google-Smtp-Source: AHgI3IbAwQ29tTtvv+5RrSd/ns75cAFIZLLcvCVs7KaMYL0dgrGj9QEdnWJB2GWXTJel6pXT7VLD X-Received: by 2002:a63:f816:: with SMTP id n22mr24857114pgh.146.1550594830146; Tue, 19 Feb 2019 08:47:10 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1550594830; cv=none; d=google.com; s=arc-20160816; b=BavVGbPa/nLn7jjGsKTt6zSMI0a6c5GMlDtqPogCKExXxG6EG83QzZgRcKVOBW6VXm KfUcOb8HQNXP7weqW1DjBJCwdEVFvo+IWluI87mrvVsUbkpc5rWYwYlycxUxy9d91AIT mb2v+Dn6cqtoHVDYiX/zub1QV9trs3TIzXhRjaB+7kvMJcfe1CesNS/M8/9PPzkMO3Ic hZe8Y6tHT9zJzcjgTwRQf/Ue62IHZf/dYRlEhTHzVONEaSC+5nmNM9nXlCd8Di+jb0oO v6FCEQ8UguryhccDZ3WIUBwmH9zMx3zsgDviJ09+U6+AYUrccVAteBzEKSYMUblKtlyC 1CuQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-language:content-transfer-encoding:in-reply-to:mime-version :user-agent:date:message-id:from:references:cc:to:subject; bh=mUn5vdC4XGDDXJI+fhBTHcwjd41VIvEJMT4VM2uu0f4=; b=kghz0ZOsUSAI0XVBhQcH49oL0QhRwDWeexhXGYt/lQdhxRSf31Yab5w6tlUWIOoMbR iCo9PURkHqkjUic/JgL43Ds+DoKg6hkCK2SkxB6WOOqZOv245dr7L45eqkusOlF4mg94 BXtlRwaFkfSACBg/BedPgz5sFWymPD3PJ+h00bSFcL18NWx76lzZCxm2EgXkr9fG/nJP H5ltZXyTdJ2mnaSlAcv51V2JU2IENHW4jxL8AGf+jCPTj2z1is/2Ltt39pvFemU55Hy5 B1zy1lYBE8O7mD+aPskP5yJyAhVWC7g+Qa5r4J/MGO1R2Y3+4a7wmZBRzR+mbODEV2RY a+2g== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of yang.shi@linux.alibaba.com designates 115.124.30.132 as permitted sender) smtp.mailfrom=yang.shi@linux.alibaba.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com. [115.124.30.132]) by mx.google.com with ESMTPS id o4si5722952pgc.345.2019.02.19.08.47.09 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Feb 2019 08:47:09 -0800 (PST) Received-SPF: pass (google.com: domain of yang.shi@linux.alibaba.com designates 115.124.30.132 as permitted sender) client-ip=115.124.30.132; Authentication-Results: mx.google.com; spf=pass (google.com: domain of yang.shi@linux.alibaba.com designates 115.124.30.132 as permitted sender) smtp.mailfrom=yang.shi@linux.alibaba.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alibaba.com X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R731e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07488;MF=yang.shi@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0TKabDau_1550594825; Received: from US-143344MP.local(mailfrom:yang.shi@linux.alibaba.com fp:SMTPD_---0TKabDau_1550594825) by smtp.aliyun-inc.com(127.0.0.1); Wed, 20 Feb 2019 00:47:07 +0800 Subject: Re: [PATCH] doc: cgroup: correct the wrong information about measure of memory pressure To: Tejun Heo Cc: hannes@cmpxchg.org, corbet@lwn.net, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <1550278564-81540-1-git-send-email-yang.shi@linux.alibaba.com> <20190218210504.GT50184@devbig004.ftw2.facebook.com> From: Yang Shi Message-ID: <79dc6298-a062-51e0-64d0-9696dc602767@linux.alibaba.com> Date: Tue, 19 Feb 2019 08:47:02 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20190218210504.GT50184@devbig004.ftw2.facebook.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US 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: On 2/18/19 1:05 PM, Tejun Heo wrote: > On Sat, Feb 16, 2019 at 08:56:04AM +0800, Yang Shi wrote: >> Since PSI has implemented some kind of measure of memory pressure, the >> statement about lack of such measure is not true anymore. >> >> Cc: Tejun Heo >> Cc: Johannes Weiner >> Cc: Jonathan Corbet >> Signed-off-by: Yang Shi >> --- >> Documentation/admin-guide/cgroup-v2.rst | 3 +-- >> 1 file changed, 1 insertion(+), 2 deletions(-) >> >> diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst >> index 7bf3f12..9a92013 100644 >> --- a/Documentation/admin-guide/cgroup-v2.rst >> +++ b/Documentation/admin-guide/cgroup-v2.rst >> @@ -1310,8 +1310,7 @@ network to a file can use all available memory but can also operate as >> performant with a small amount of memory. A measure of memory >> pressure - how much the workload is being impacted due to lack of >> memory - is necessary to determine whether a workload needs more >> -memory; unfortunately, memory pressure monitoring mechanism isn't >> -implemented yet. >> +memory. > Maybe refer to PSI? I thought so too, but the above "memory.pressure" has already referred to PSI. So, I was not sure if we should duplicate PSI information. Thanks, Yang > > Thanks. >