linux-kernel - Re: [PATCH 2/2] memcg: unify memcg stat flushing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YVcbOZTQOTAKXzol@cmpxchg.org>
Date:   Fri, 1 Oct 2021 10:29:13 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Michal Koutný <mkoutny@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] memcg: unify memcg stat flushing

On Wed, Sep 29, 2021 at 09:47:11PM -0700, Shakeel Butt wrote:
> The memcg stats can be flushed in multiple context and potentially in
> parallel too. For example multiple parallel user space readers for memcg
> stats will contend on the rstat locks with each other. There is no need
> for that. We just need one flusher and everyone else can benefit. In
> addition after aa48e47e3906 ("memcg: infrastructure to flush memcg
> stats") the kernel periodically flush the memcg stats from the root, so,
> the other flushers will potentially have much less work to do.
> 
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>