linux-kernel - Re: [External] [PATCH v3 1/3] mm, memcg: add mem_cgroup_disabled checks in vmpressure and swap-related functions

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Date:   Sat, 10 Jul 2021 18:54:20 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <guro@...com>, Yang Shi <shy828301@...il.com>,
        Alex Shi <alexs@...nel.org>,
        Wei Yang <richard.weiyang@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>, apopple@...dia.com,
        Minchan Kim <minchan@...nel.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        kernel-team@...roid.com
Subject: Re: [External] [PATCH v3 1/3] mm, memcg: add mem_cgroup_disabled
 checks in vmpressure and swap-related functions

On Sat, Jul 10, 2021 at 8:36 AM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> Add mem_cgroup_disabled check in vmpressure, mem_cgroup_uncharge_swap and
> cgroup_throttle_swaprate functions. This minimizes the memcg overhead in
> the pagefault and exit_mmap paths when memcgs are disabled using
> cgroup_disable=memory command-line option.
> This change results in ~2.1% overhead reduction when running PFT test
> comparing {CONFIG_MEMCG=n, CONFIG_MEMCG_SWAP=n} against {CONFIG_MEMCG=y,
> CONFIG_MEMCG_SWAP=y, cgroup_disable=memory} configuration on an 8-core
> ARM64 Android device.
>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>

The changes are straightforward. LGTM.
Reviewed-by: Muchun Song <songmuchun@...edance.com>