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Date:   Fri, 9 Jul 2021 10:41:00 -0400
From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Suren Baghdasaryan <surenb@google.com>
Cc:     tj@kernel.org, mhocko@kernel.org, vdavydov.dev@gmail.com,
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        linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
        linux-mm@kvack.org, kernel-team@android.com
Subject: Re: [PATCH 1/3] mm, memcg: add mem_cgroup_disabled checks in
 vmpressure and swap-related functions
Message-ID: <YOhf/DhU3ATIrblp@cmpxchg.org>
References: <20210709000509.2618345-1-surenb@google.com>
 <20210709000509.2618345-2-surenb@google.com>
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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@google.com>

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