Re: [PATCH 5/5] mlock: fix unevictable_pgs event counts on THP

[Shakeel Butt]

On Sun, Aug 30, 2020 at 2:09 PM Hugh Dickins <hughd@xxxxxxxxxx> wrote:
>
> 5.8 commit 5d91f31faf8e ("mm: swap: fix vmstats for huge page") has
> established that vm_events should count every subpage of a THP,
> including unevictable_pgs_culled and unevictable_pgs_rescued; but
> lru_cache_add_inactive_or_unevictable() was not doing so for
> unevictable_pgs_mlocked, and mm/mlock.c was not doing so for
> unevictable_pgs mlocked, munlocked, cleared and stranded.
>
> Fix them; but THPs don't go the pagevec way in mlock.c,
> so no fixes needed on that path.
>
> Fixes: 5d91f31faf8e ("mm: swap: fix vmstats for huge page")
> Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>

Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>