linux-kernel - Re: [PATCH] mm: memcontrol: use per-cpu stocks for socket memory uncharging

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Message-ID: <CALvZod6jNNA=j0WzUzjLxe0vnZeCsJEZ=Q92CgfT65-g2tdCfg@mail.gmail.com>
Date:   Thu, 7 Sep 2017 12:43:35 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Roman Gushchin <guro@...com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Linux MM <linux-mm@...ck.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        cgroups@...r.kernel.org, kernel-team@...com,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: memcontrol: use per-cpu stocks for socket memory uncharging

On Thu, Sep 7, 2017 at 11:47 AM, Roman Gushchin <guro@...com> wrote:
> On Thu, Sep 07, 2017 at 11:44:12AM -0700, Shakeel Butt wrote:
>> >> As far as other types of pages go: page cache and anon are already
>> >> batched pretty well, but I think kmem might benefit from this
>> >> too. Have you considered using the stock in memcg_kmem_uncharge()?
>> >
>> > Good idea!
>> > I'll try to find an appropriate testcase and check if it really
>> > brings any benefits. If so, I'll master a patch.
>> >
>>
>> Hi Roman, did you get the chance to try this on memcg_kmem_uncharge()?
>
> Hi Shakeel!
>
> Not yet, I'll try to it asap.
> Do you have an example when it's costly?
>

Nah, I was also curious of such examples.