linux-kernel - Re: [PATCH -V11 8/9] mm/vmscan: never demote for memcg reclaim

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Date:   Wed, 21 Jul 2021 17:38:45 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Huang Ying <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Yang Shi <shy828301@...il.com>, Michal Hocko <mhocko@...e.com>,
        Wei Xu <weixugc@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        David Rientjes <rientjes@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Greg Thelen <gthelen@...gle.com>,
        Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH -V11 8/9] mm/vmscan: never demote for memcg reclaim

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

> From: Dave Hansen <dave.hansen@...ux.intel.com>
>
> Global reclaim aims to reduce the amount of memory used on a given node or
> set of nodes.  Migrating pages to another node serves this purpose.
>
> memcg reclaim is different.  Its goal is to reduce the total memory
> consumption of the entire memcg, across all nodes.  Migration does not
> assist memcg reclaim because it just moves page contents between nodes
> rather than actually reducing memory consumption.
>
> Link: https://lkml.kernel.org/r/20210715055145.195411-9-ying.huang@intel.com
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Suggested-by: Yang Shi <yang.shi@...ux.alibaba.com>
> Reviewed-by: Yang Shi <shy828301@...il.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Wei Xu <weixugc@...gle.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Zi Yan <ziy@...dia.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Greg Thelen <gthelen@...gle.com>
> Cc: Keith Busch <kbusch@...nel.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  mm/vmscan.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)

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

Should this be folded into Patch 4 when can_demote() is introduced?


—
Best Regards,
Yan, Zi

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