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[209.85.220.65]) by mx.google.com with SMTPS id q8-v6sor9327054ljg.29.2019.02.19.02.46.03 for (Google Transport Security); Tue, 19 Feb 2019 02:46:04 -0800 (PST) Received-SPF: pass (google.com: domain of ufo19890607@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=YpoYatti; spf=pass (google.com: domain of ufo19890607@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=ufo19890607@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=ffG50zcYRZxWfUGn5WkhVM3jBYqv2vEwRvPWaUtideQ=; b=YpoYattijyPWHezIgZMKDwdjebSn69PKDuhJxtXkwpjt/p8HH2X1x+3YGadInP2Dx1 rGlMK8oPorD/BJVjvzjPYOn/gp6hSvmVGAZ956FJHnKdzavF59LNoVdN9YDgc/JBqRM/ DMoBFHlW/537VF0CeNabpK9+6W2AJ8K4ziSdeZh7zDDz34Oj9HlH7hYsMJzwv5j8UTKF /3gTZkXUKflREJJyEeTWV2M6GWGI/Tu8iuRyL3QeSNPeVcOHvR0lDn28auo4wrHXAkc4 BFFliD+xepgc6tV+e4S7WKF07D5iNbCZwn3KyN38V83wZKBoOPwgJ6KE42M8l09V7GU2 d6Pg== X-Google-Smtp-Source: AHgI3IZ+FYcQpqLOs3r6vs6rfw+yWXTt3gr7z2oiY8vq1ixrrl1/gx3aW8UGINQJJL3tc1uFpnVxZoP13f0D7A/hf1Y= X-Received: by 2002:a2e:965a:: with SMTP id z26mr15089257ljh.59.1550573163554; Tue, 19 Feb 2019 02:46:03 -0800 (PST) MIME-Version: 1.0 References: <1550278564-81540-1-git-send-email-yang.shi@linux.alibaba.com> <20190218210504.GT50184@devbig004.ftw2.facebook.com> In-Reply-To: <20190218210504.GT50184@devbig004.ftw2.facebook.com> From: =?UTF-8?B?56a56Iif6ZSu?= Date: Tue, 19 Feb 2019 18:45:52 +0800 Message-ID: Subject: Re: [PATCH] doc: cgroup: correct the wrong information about measure of memory pressure To: Tejun Heo Cc: Yang Shi , hannes@cmpxchg.org, corbet@lwn.net, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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: Hi TeJun I've built the 5.0.0-rc6 kernel with psi option, but I cannot find any cgroup.controllers when I mounted cgroup2. [root@bogon /]# uname -r [root@bogon /]# 5.0.0-rc6+ [root@bogon /]# mount -t cgroup2 none cgroup2/ [root@bogon /]# cat cgroup2/cgroup.controllers [root@bogon /] [root@bogon /]# cat cgroup2/cgroup.subtree_control [root@bogon /]# What's wrong with this kernel? Or maybe I lost some mount option? Thanks Yuzhoujian Tejun Heo =E4=BA=8E2019=E5=B9=B42=E6=9C=8819=E6=97=A5=E5=91= =A8=E4=BA=8C =E4=B8=8A=E5=8D=8810:32=E5=86=99=E9=81=93=EF=BC=9A > > 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/ad= min-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 bu= t 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? > > Thanks. > > -- > tejun