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RFC few memory offlining enhancements

Michal Hocko linux-mm lkml 1 version In review

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  1. v1 RFC Latest3 patches 23 repliesIn review

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/3mm, memory_hotplug: try to migrate full section worth of pagesmm/memory_hotplug.c+2 -66 replies
2/3mm, memory_hotplug: deobfuscate migration part of offliningmm/memory_hotplug.c+31 -295 replies
3/3mm, fault_around: do not take a reference to a locked pagemm/filemap.c+3 -012 replies

Reviews trailers per patch

All 3 patches have a Reviewed-by or Acked-by.

PatchKirill A. ShutemovDavid HildenbrandPavel TatashinOscar SalvadorHugh DickinsWilliam Kucharski
1/3R-b R-b R-b
2/3R-b R-b
3/3A-b R-b A-b R-b

Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes. Scroll the table sideways for all 6 reviewers.

Read the v1 thread

Cover letter [RFC PATCH 0/3] few memory offlining enhancements

I have been chasing memory offlining not making progress recently. On the way I have noticed few weird decisions in the code. The migration itself is restricted without a reasonable justification and the retry loop around the migration is quite messy. This is addressed by patch 1 and patch 2.

Patch 3 is targeting on the faultaround code which has been a hot candidate for the initial issue reported upstream [1] and that I am debugging internally. It turned out to be not the main contributor in the end but I believe we should address it regardless. See the patch description for more details.

[1] http://lkml.kernel.org/r/20181114070909.GB2653@MiWiFi-R3L-srv