From: "Michal Koutný" <mkoutny@suse.com>
To: Shakeel Butt <shakeelb@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Ivan Babrou <ivan@cloudflare.com>,
Cgroups <cgroups@vger.kernel.org>, Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Daniel Dao <dqminh@cloudflare.com>,
stable <stable@vger.kernel.org>
Subject: Re: [PATCH] memcg: async flush memcg stats from perf sensitive codepaths
Date: Mon, 28 Feb 2022 19:46:53 +0100 [thread overview]
Message-ID: <20220228184653.GA1812@blackbody.suse.cz> (raw)
In-Reply-To: <CALvZod7SA17vounKnq1KX23172rztNN_Oo0K1XaeEuS4JVEhMw@mail.gmail.com>
On Fri, Feb 25, 2022 at 05:42:57PM -0800, Shakeel Butt <shakeelb@google.com> wrote:
> Yes, the right fix would be to optimize the flushing code (but that
> would require more work/time). However I still think letting
> performance critical code paths to skip the sync flush would be good
> in general. So, if the current patch is not to your liking we can
> remove mem_cgroup_flush_stats() from workingset_refault().
What about flushing just the subtree of the memcg where the refault
happens?
It doesn't reduce the overall work and there's still full-tree
cgroup_rstat_lock but it should make the chunks of work smaller
durations more regular.
Michal
next prev parent reply other threads:[~2022-02-28 18:46 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-26 0:24 Shakeel Butt
2022-02-26 0:58 ` Andrew Morton
2022-02-26 1:20 ` Andrew Morton
2022-02-26 1:42 ` Shakeel Butt
2022-02-28 18:46 ` Michal Koutný [this message]
2022-02-28 22:46 ` Shakeel Butt
2022-02-26 2:32 ` kernel test robot
2022-02-26 12:43 ` kernel test robot
2022-03-01 9:05 ` Michal Hocko
2022-03-01 17:21 ` Shakeel Butt
2022-03-01 17:57 ` Michal Koutný
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220228184653.GA1812@blackbody.suse.cz \
--to=mkoutny@suse.com \
--cc=akpm@linux-foundation.org \
--cc=cgroups@vger.kernel.org \
--cc=dqminh@cloudflare.com \
--cc=hannes@cmpxchg.org \
--cc=ivan@cloudflare.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=roman.gushchin@linux.dev \
--cc=shakeelb@google.com \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox