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Date:   Wed, 20 Sep 2023 09:07:11 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     liwenyu <wenyuli@ex.bilibili.com>
Cc:     bsingharora@gmail.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, wangyun@bilibili.com
Subject: Re: [PATCH] delayacct: add memory reclaim delay in
 get_page_from_freelist
Message-Id: <20230920090711.ecc2d84cc29bb0fa540f1999@linux-foundation.org>
In-Reply-To: <181C946095F0252B+7cc60eca-1abf-4502-aad3-ffd8ef89d910@ex.bilibili.com>
References: <181C946095F0252B+7cc60eca-1abf-4502-aad3-ffd8ef89d910@ex.bilibili.com>
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On Wed, 20 Sep 2023 17:38:49 +0800 liwenyu <wenyuli@ex.bilibili.com> wrote:

> The current memory reclaim delay statistics only count the direct memory
> reclaim of the task in do_try_to_free_pages(). In systems with NUMA
> open, some tasks occasionally experience slower response times, but the
> total count of reclaim does not increase, using ftrace can show that
> node_reclaim has occurred.
> 
> The memory reclaim occurring in get_page_from_freelist() is also due to
> heavy memory load. To get the impact of tasks in memory reclaim, this
> patch adds the statistics of the memory reclaim delay statistics for
> __node_reclaim().

Please review Documentation/accounting/delay-accounting.rst, see if
there is some change we can make to reflect this patch.

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