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

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Date:   Wed, 22 Jan 2020 14:05:47 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
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 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.