linux-kernel - Re: [PATCH] mm: memcontrol: add file_thp, shmem

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Message-ID: <2A2CE07F-47DC-4B3B-82D3-F0CDD2C58B42@fb.com>
Date:   Mon, 26 Oct 2020 20:24:50 +0000
From:   Song Liu <songliubraving@...com>
To:     Johannes Weiner <hannes@...xchg.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH] mm: memcontrol: add file_thp, shmem_thp to memory.stat



> On Oct 22, 2020, at 8:18 AM, Johannes Weiner <hannes@...xchg.org> wrote:
> 
> As huge page usage in the page cache and for shmem files proliferates
> in our production environment, the performance monitoring team has
> asked for per-cgroup stats on those pages.
> 
> We already track and export anon_thp per cgroup. We already track file
> THP and shmem THP per node, so making them per-cgroup is only a matter
> of switching from node to lruvec counters. All callsites are in places
> where the pages are charged and locked, so page->memcg is stable.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Song Liu <songliubraving@...com>

Thanks!