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authorMel Gorman <mel@csn.ul.ie>2009-06-17 02:32:07 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-17 06:47:34 +0400
commited0ae21dc5fe3b9ad4cf1c7bb2bfd2ad596c481c (patch)
tree1ccdf36012a6a8ed22c5a78f7093bae0a259274e /mm/internal.h
parent0ac3a4099b0171ff965836182bc688bb8ca01058 (diff)
downloadlinux-ed0ae21dc5fe3b9ad4cf1c7bb2bfd2ad596c481c.tar.xz
page allocator: do not call get_pageblock_migratetype() more than necessary
get_pageblock_migratetype() is potentially called twice for every page free. Once, when being freed to the pcp lists and once when being freed back to buddy. When freeing from the pcp lists, it is known what the pageblock type was at the time of free so use it rather than rechecking. In low memory situations under memory pressure, this might skew anti-fragmentation slightly but the interference is minimal and decisions that are fragmenting memory are being made anyway. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
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