linux-kernel - Re: [PATCH] mm/memcontrol: update lruvec counters in mem_cgroup_move

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Message-ID: <89171a94-8b6f-e949-0078-10fa8fd26dfc@yandex-team.ru>
Date:   Tue, 15 Oct 2019 17:04:44 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>
Subject: Re: [PATCH] mm/memcontrol: update lruvec counters in
 mem_cgroup_move_account

On 15/10/2019 16.53, Johannes Weiner wrote:
> On Tue, Oct 15, 2019 at 11:09:59AM +0300, Konstantin Khlebnikov wrote:
>> Mapped, dirty and writeback pages are also counted in per-lruvec stats.
>> These counters needs update when page is moved between cgroups.
>>
>> Fixes: 00f3ca2c2d66 ("mm: memcontrol: per-lruvec stats infrastructure")
>> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> 
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> 
> Please mention in the changelog that currently is nobody *consuming*
> the lruvec versions of these counters and that there is no
> user-visible effect. Thanks
> 

Maybe just kill all these per-lruvec counters?
I see only one user which have no alternative data source: WORKINGSET_ACTIVATE.

This will save some memory: 32 * sizeof(long) * nr_nodes * nr_cpus bytes