On 21 Jul 2021, at 2:39, Huang Ying wrote:

> From: Keith Busch <kbusch@kernel.org>
>
> Reclaim anonymous pages if a migration path is available now that demotion
> provides a non-swap recourse for reclaiming anon pages.
>
> Note that this check is subtly different from the can_age_anon_pages()
> checks.  This mechanism checks whether a specific page in a specific
> context can actually be reclaimed, given current swap space and cgroup
> limits.
>
> can_age_anon_pages() is a much simpler and more preliminary check which
> just says whether there is a possibility of future reclaim.
>
> Link: https://lkml.kernel.org/r/20210715055145.195411-8-ying.huang@intel.com
> Cc: Keith Busch <kbusch@kernel.org>
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Reviewed-by: Yang Shi <shy828301@gmail.com>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Zi Yan <ziy@nvidia.com>
> Cc: Wei Xu <weixugc@google.com>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Greg Thelen <gthelen@google.com>
> Cc: Oscar Salvador <osalvador@suse.de>
> Cc: Yang Shi <yang.shi@linux.alibaba.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
>  mm/vmscan.c | 34 ++++++++++++++++++++++++++++++----
>  1 file changed, 30 insertions(+), 4 deletions(-)

LGTM. Reviewed-by: Zi Yan <ziy@nvidia.com>

—
Best Regards,
Yan, Zi