linux-kernel - Re: [PATCH] delayacct: add memory reclaim delay in get_page_from

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Message-Id: <20230920090711.ecc2d84cc29bb0fa540f1999@linux-foundation.org>
Date:   Wed, 20 Sep 2023 09:07:11 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     liwenyu <wenyuli@...bilibili.com>
Cc:     bsingharora@...il.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, wangyun@...ibili.com
Subject: Re: [PATCH] delayacct: add memory reclaim delay in
 get_page_from_freelist

On Wed, 20 Sep 2023 17:38:49 +0800 liwenyu <wenyuli@...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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