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mm: compaction: add /sys trigger for per-node memory compaction

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Add a per-node sysfs file called compact.  When the file is written to,
each zone in that node is compacted.  The intention that this would be
used by something like a job scheduler in a batch system before a job
starts so that the job can allocate the maximum number of hugepages
without significant start-up cost.

Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Reviewed-by: Christoph Lameter <[email protected]>
Reviewed-by: Minchan Kim <[email protected]>
Reviewed-by: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2010-05-24 14:32:29 -07:00 • committed by Linus Torvalds
commit ed4a6d7f06
4 changed files with 49 additions and 0 deletions
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Documentation/ABI/testing/sysfs-devices-node Normal file
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What: /sys/devices/system/node/nodeX/compact
Date: February 2010
Contact: Mel Gorman <[email protected]>
Description:
When this file is written to, all memory within that node
will be compacted. When it completes, memory will be freed
into blocks which have as many contiguous pages as possible