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    SubjectRe: [PATCH v2 2/2] mm/pageblock: remove false sharing in pageblock_flags

    On 08/19/2020 11:17 AM, Alex Shi wrote:
    > Current pageblock_flags is only 4 bits, so it has to share a char size
    > in cmpxchg when get set, the false sharing cause perf drop.
    > If we incrase the bits up to 8, false sharing would gone in cmpxchg. and
    > the only cost is half char per pageblock, which is half char per 128MB
    > on x86, 4 chars in 1 GB.

    Agreed that increase in memory utilization is negligible here but does
    this really improve performance ?

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