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    SubjectRe: [PATCH -V11 8/9] mm/vmscan: never demote for memcg reclaim
    On Wed, Jul 21, 2021 at 2:58 PM Dave Hansen <dave.hansen@intel.com> wrote:
    >
    > On 7/21/21 2:38 PM, Zi Yan wrote:
    > > On 21 Jul 2021, at 2:39, Huang Ying wrote:
    > >> From: Dave Hansen <dave.hansen@linux.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.
    > ...
    > > Should this be folded into Patch 4 when can_demote() is
    > > introduced?
    >
    > I guess it could be. But, it's logically separate since it has its
    > own justification which is rather discrete.
    >
    > I think it's best to keep it separate.

    Yes, I agree.

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