linux-kernel - Re: [PATCH] mm: move_pages: report the number of non-attempted pages

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Date:   Wed, 22 Jan 2020 14:43:20 -0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     mhocko@...e.com, richardw.yang@...ux.intel.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] mm: move_pages: report the number of non-attempted pages



On 1/22/20 2:05 PM, Andrew Morton wrote:
> On Thu, 23 Jan 2020 03:39:50 +0800 Yang Shi <yang.shi@...ux.alibaba.com> wrote:
>
>> Since commit a49bd4d71637 ("mm, numa: rework do_pages_move"),
>> the semantic of move_pages() was changed to return the number of
>> non-migrated pages (failed to migration) and the call would be aborted
>> immediately if migrate_pages() returns positive value.  But it didn't
>> report the number of pages that we even haven't attempted to migrate.
>> So, fix it by including non-attempted pages in the return value.
>>
>> Fixes: a49bd4d71637 ("mm, numa: rework do_pages_move")
>> Suggested-by: Michal Hocko <mhocko@...e.com>
>> Cc: Wei Yang <richardw.yang@...ux.intel.com>
>> Cc: <stable@...r.kernel.org>    [4.17+]
>> Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
>> ---
>> The patch is based off Wei Yang's cleanup patchset:
>> https://lore.kernel.org/linux-mm/20200122011647.13636-1-richardw.yang@linux.intel.com/T/#t
> Can you please redo this so it is applicable to current mainline?  That
> will make it more easily backportable and this fix is higher priority
> than a set of cleanups.

Sure.