linux-kernel - Re: [PATCH v2] memcg: refill_stock for kmem uncharging too

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Message-ID: <CALvZod5Peau7D-O1oi0jFfiOCJrSOMHDnr6TPrTxawt_jh9izw@mail.gmail.com>
Date:   Sun, 28 Apr 2019 16:54:24 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Linux MM <linux-mm@...ck.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] memcg: refill_stock for kmem uncharging too

On Wed, Apr 24, 2019 at 11:49 PM Michal Hocko <mhocko@...nel.org> wrote:
>
> On Tue 23-04-19 08:44:05, Shakeel Butt wrote:
> > The commit 475d0487a2ad ("mm: memcontrol: use per-cpu stocks for socket
> > memory uncharging") added refill_stock() for skmem uncharging path to
> > optimize workloads having high network traffic. Do the same for the kmem
> > uncharging as well. Though we can bypass the refill for the offlined
> > memcgs but it may impact the performance of network traffic for the
> > sockets used by other cgroups.
>
> While the change makes sense, I would really like to see what kind of
> effect on performance does it really have. Do you have any specific
> workload that benefits from it?
>

Thanks for the review. I will run some benchmarks and report back later.

Shakeel