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

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Message-ID: <20170907184745.GA20598@castle.DHCP.thefacebook.com>
Date:   Thu, 7 Sep 2017 19:47:45 +0100
From:   Roman Gushchin <guro@...com>
To:     Shakeel Butt <shakeelb@...gle.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 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?

Thanks!