linux-kernel - Re: [PATCH v2 1/1] mm, memcg: inline mem_cgroup_{charge/uncharge} to improve disabled memcg config

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Message-ID: <YOyKfySwuBfgtEvW@cmpxchg.org>
Date:   Mon, 12 Jul 2021 14:31:27 -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,
        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 v2 1/1] mm, memcg: inline mem_cgroup_{charge/uncharge} to
 improve disabled memcg config

On Fri, Jul 09, 2021 at 10:15:54AM -0700, Suren Baghdasaryan wrote:
> Inline mem_cgroup_{charge/uncharge} and mem_cgroup_uncharge_list functions
> functions to perform mem_cgroup_disabled static key check inline before
> calling the main body of the function. 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 ~0.4% overhead reduction when running PFT test
> comparing {CONFIG_MEMCG=n} against {CONFIG_MEMCG=y, cgroup_disable=memory}
> configurationon on an 8-core ARM64 Android device.
> 
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>

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

Thanks!