linux-kernel - Re: [PATCH] mm/migrate: make migrate_pages

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Date: Thu, 20 Jun 2024 09:23:42 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: Zi Yan <ziy@...dia.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,  Hugh Dickins
 <hughd@...gle.com>,  <linux-mm@...ck.org>,  "Matthew Wilcox (Oracle)"
 <willy@...radead.org>,  Yang Shi <shy828301@...il.com>,  David Hildenbrand
 <david@...hat.com>,  Yin Fengwei <fengwei.yin@...el.com>,
  <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/migrate: make migrate_pages_batch() stats consistent.

Zi Yan <ziy@...dia.com> writes:

> On 19 Jun 2024, at 3:25, Huang, Ying wrote:
>
>> Zi Yan <zi.yan@...t.com> writes:
>>
>>> From: Zi Yan <ziy@...dia.com>
>>>
>>> As Ying pointed out in [1], stats->nr_thp_failed needs to be updated to
>>> avoid stats inconsistency between MIGRATE_SYNC and MIGRATE_ASYNC when
>>> calling migrate_pages_batch().
>
> Because if not, when migrate_pages_batch() is called via
> migrate_pages(MIGRATE_ASYNC), nr_thp_failed will not be increased and
> when migrate_pages_batch() is called via migrate_pages(MIGRATE_SYNC*),
> nr_thp_failed will be increase in migrate_pages_sync() by
> stats->nr_thp_failed += astats.nr_thp_split.
>
>>>
>>> [1] https://lore.kernel.org/linux-mm/87msnq7key.fsf@yhuang6-desk2.ccr.corp.intel.com/
>>
>> IMHO, we shouldn't ask people to use link to understand the patch
>> description or commit message.  If so, we can make the link less
>> outstanding and maybe add more words about the issue.
>
> I summarized your explanation from the link. You think the summary is not
> enough? I can add more text. Let me know if the above text looks
> good to you, then I can resend the patch. Thanks.

It looks good to me, Thanks!

--
Best Regards,
Huang, Ying