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authorMel Gorman <mel@csn.ul.ie>2010-05-24 14:32:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 08:06:59 -0700
commitf1a5ab1210579e2d3ac8c0c227645823af5aafb0 (patch)
treec646a3d58150eab1a8280d02e6254ef6b90a6f37 /mm/vmscan.c
parentd7a5752c0c19750312efab3a2a80d350e11fa4a2 (diff)
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mm: export fragmentation index via debugfs
The fragmentation fragmentation index, is only meaningful if an allocation would fail and indicates what the failure is due to. A value of -1 such as in many of the examples above states that the allocation would succeed. If it would fail, the value is between 0 and 1. A value tending towards 0 implies the allocation failed due to a lack of memory. A value tending towards 1 implies it failed due to external fragmentation. For the most part, the huge page size will be the size of interest but not necessarily so it is exported on a per-order and per-zo basis via /sys/kernel/debug/extfrag/extfrag_index > cat /sys/kernel/debug/extfrag/extfrag_index Node 0, zone DMA -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.00 Node 0, zone Normal -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 -1.000 0.954 Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: Rik van Riel <riel@redhat.com> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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