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

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Message-ID: <9F7DFA20B598B0C4+7dc938b0-67f9-422a-8051-3a7c1fd7a6bf@ex.bilibili.com>
Date:   Mon, 25 Sep 2023 14:43:36 +0800
From:   liwenyu <wenyuli@...bilibili.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
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.
> 
> Your email client is wordwrapping the patches - please check that for
> next time.
> 

There is no need to change the 
Documentation/accounting/delay-accounting.rst, because this patch is 
only an expansion of  memory reclaim delayacct.

Thanks!