Re: [PATCH] delayacct: add memory reclaim delay in get_page_from_freelist

[Andrew Morton]

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