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

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Date:   Fri, 9 Jul 2021 10:41:00 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     tj@...nel.org, mhocko@...nel.org, vdavydov.dev@...il.com,
        akpm@...ux-foundation.org, shakeelb@...gle.com, guro@...com,
        songmuchun@...edance.com, shy828301@...il.com, alexs@...nel.org,
        alexander.h.duyck@...ux.intel.com, richard.weiyang@...il.com,
        vbabka@...e.cz, axboe@...nel.dk, iamjoonsoo.kim@....com,
        david@...hat.com, willy@...radead.org, apopple@...dia.com,
        minchan@...nel.org, linmiaohe@...wei.com,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...roid.com
Subject: Re: [PATCH 1/3] mm, memcg: add mem_cgroup_disabled checks in
 vmpressure and swap-related functions

On Thu, Jul 08, 2021 at 05:05:07PM -0700, Suren Baghdasaryan 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>

Acked-by: Johannes Weiner <hannes@...xchg.org>