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

[Yang Shi]

On 1/22/20 2:05 PM, Andrew Morton wrote:
> On Thu, 23 Jan 2020 03:39:50 +0800 Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx> 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@xxxxxxxx>
> > Cc: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
> > Cc: <stable@xxxxxxxxxxxxxxx>    [4.17+]
> > Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
> > ---
> > The patch is based off Wei Yang's cleanup patchset:
> > https://lore.kernel.org/linux-mm/20200122011647.13636-1-richardw.yang@xxxxxxxxxxxxxxx/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.