linux-kernel - Re: memleak in cgroup

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Date:   Mon, 27 Apr 2020 13:13:04 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     tj@...nel.org, lizefan@...wei.com, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, wangkefeng.wang@...wei.com,
        linux-mm@...ck.org, guro@...xchg.org
Subject: Re: memleak in cgroup

+cc Roman who has been looking the most at this area

On Mon, Apr 27, 2020 at 03:48:13PM +0800, Yang Yingliang wrote:
> +cc linux-mm@...ck.org <mailto:linux-mm@...ck.org>
> 
> On 2020/4/26 19:21, Yang Yingliang wrote:
> > Hi,
> > 
> > When I doing the follow test in kernel-5.7-rc2, I found mem-free is
> > decreased
> > 
> > #!/bin/sh
> > cd /sys/fs/cgroup/memory/
> > 
> > for((i=0;i<45;i++))
> > do
> >         for((j=0;j<60000;j++))
> >         do
> >                 mkdir /sys/fs/cgroup/memory/yyl-cg$j
> >         done
> >         sleep 1
> >         ls /sys/fs/cgroup/memory/ | grep yyl | xargs rmdir
> > done

Should be easy enough to reproduce, thanks for the report. I'll try to
take a look later this week, unless Roman beats me to it.

Is this a new observation in 5.7-rc2?

Can you provide /sys/fs/cgroup/unified/cgroup.stat after the test?