linux-kernel - Re: [PATCH] memcg: hugetlbfs basic usage accounting

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Date:   Tue, 14 Nov 2017 13:06:07 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Dave Hansen <dave.hansen@...el.com>, kernel-team@...com,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcg: hugetlbfs basic usage accounting

On Tue, Nov 14, 2017 at 05:24:29PM +0000, Roman Gushchin wrote:
> This patch implements basic accounting of memory consumption
> by hugetlbfs pages for cgroup v2 memory controller.
> 
> Cgroup v2 memory controller lacks any visibility into the
> hugetlbfs memory consumption. Cgroup v1 implemented a separate
> hugetlbfs controller, which provided such stats, and also
> provided some control abilities. Although porting of the
> hugetlbfs controller to cgroup v2 is arguable a good idea and
> is outside of scope of this patch, it's very useful to have
> basic stats provided by memory.stat.
> 
> As hugetlbfs memory can easily represent a big portion of total
> memory, it's important to understand who (which memcg/container)
> is using it.
> 
> The number is represented in memory.stat as "hugetlb" in bytes and
> is printed unconditionally. Accounting code doesn't depend on
> cgroup v1 hugetlb controller.
> 
> Example:
>   $ cat /sys/fs/cgroup/user.slice/user-0.slice/session-1.scope/memory.stat
>   anon 1634304
>   file 1163264
>   kernel_stack 16384
>   slab 737280
>   sock 0
>   shmem 0
>   file_mapped 32768
>   file_dirty 4096
>   file_writeback 0
>   inactive_anon 0
>   active_anon 1634304
>   inactive_file 65536
>   active_file 1097728
>   unevictable 0
>   slab_reclaimable 282624
>   slab_unreclaimable 454656
>   hugetlb 1073741824
>   pgfault 4580
>   pgmajfault 13
>   ...
> 
> Signed-off-by: Roman Gushchin <guro@...com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vladimir Davydov <vdavydov.dev@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Mike Kravetz <mike.kravetz@...cle.com>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: kernel-team@...com
> Cc: cgroups@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun