Re: [PATCH 2/2] mm: compaction: add /proc/vmstat entry for rescuedMIGRATE_UNMOVABLE pageblocks

[KOSAKI Motohiro]

(6/14/12 12:02 PM), Bartlomiej Zolnierkiewicz wrote:
> From: Bartlomiej Zolnierkiewicz<b.zolnierkie@xxxxxxxxxxx>
> Subject: [PATCH] mm: compaction: add /proc/vmstat entry for rescued MIGRATE_UNMOVABLE pageblocks
>
> compact_rescued_unmovable_blocks shows the number of MIGRATE_UNMOVABLE
> pageblocks converted back to MIGRATE_MOVABLE type by the memory compaction
> code.  Non-zero values indicate that large kernel-originated allocations
> of MIGRATE_UNMOVABLE type happen in the system and need special handling
> from the memory compaction code.
>
> This new vmstat entry is optional but useful for development and understanding
> the system.

This description don't describe why admin need this stat and how to use it.


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