linux-kernel - Re: [BUG]: mm/vmscan.c: shrink_slab does not work correctly with memcg disabled via commandline

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Message-ID: <20190801163213.GO11627@dhcp22.suse.cz>
Date:   Thu, 1 Aug 2019 18:32:13 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Jan Hadrava <had@....mff.cuni.cz>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        wizards@....mff.cuni.cz, Kirill Tkhai <ktkhai@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [BUG]: mm/vmscan.c: shrink_slab does not work correctly with
 memcg disabled via commandline

On Thu 01-08-19 17:54:34, Jan Hadrava wrote:
> On Thu, Aug 01, 2019 at 04:06:10PM +0200, Michal Hocko wrote:
> > On Thu 01-08-19 15:42:50, Jan Hadrava wrote:
> > > There seems to be a bug in mm/vmscan.c shrink_slab function when kernel is
> > > compilled with CONFIG_MEMCG=y and it is then disabled at boot with commandline
> > > parameter cgroup_disable=memory. SLABs are then not getting shrinked if the
> > > system memory is consumed by userspace.
> > 
> > This looks similar to http://lkml.kernel.org/r/1563385526-20805-1-git-send-email-yang.shi@linux.alibaba.com
> > although the culprit commit has been identified to be different. Could
> > you try it out please? Maybe we need more fixes.
> 
> Yes, it is same.

I am happy to hear that!

> So my report is duplicate and I'm just bad in searching the
> archives, sorry.

No worries. Your bug report was really good with great level of details.
I wish all the bug reports were done so thoroughly.
 
> Just to be sure, i run my tests and patch proposed in the original thread
> solves my issue in all four affected stable releases:

Cc Andrew. I assume we can assume your Tested-by tag?

Thanks a lot!
-- 
Michal Hocko
SUSE Labs