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    SubjectRe: [PATCH v2 00/10] try to reduce fragmenting fallbacks
    On Fri, Feb 10, 2017 at 06:23:33PM +0100, Vlastimil Babka wrote:
    > Hi,
    > this is a v2 of [1] from last year, which was a response to Johanes' worries
    > about mobility grouping regressions. There are some new patches and the order
    > goes from cleanups to "obvious wins" towards "just RFC" (last two patches).
    > But it's all theoretical for now, I'm trying to run some tests with the usual
    > problem of not having good workloads and metrics :) But I'd like to hear some
    > feedback anyway. For now this is based on v4.9.
    > I think the only substantial new patch is 08/10, the rest is some cleanups,
    > small tweaks and bugfixes.

    By and large, I like the series, particularly patches 7 and 8. I cannot
    make up my mind about the RFC patches 9 and 10 yet. Conceptually they
    seem sound but they are much more far reaching than the rest of the

    It would be nice if patches 1-8 could be treated in isolation with data
    on the number of extfrag events triggered, time spent in compaction and
    the success rate. Patches 9 and 10 are tricy enough that they would need
    data per patch where as patches 1-8 should be ok with data gathered for
    the whole series.

    Mel Gorman
    SUSE Labs

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