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authorMel Gorman <mel@csn.ul.ie>2007-07-17 15:03:13 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 21:22:59 +0400
commit396faf0303d273219db5d7eb4a2879ad977ed185 (patch)
tree96cb64fd6713ef7a924f4f878e259aea781f079a /Documentation/sysctl
parent2a1e274acf0b1c192face19a4be7c12d4503eaaf (diff)
downloadlinux-396faf0303d273219db5d7eb4a2879ad977ed185.tar.xz
Allow huge page allocations to use GFP_HIGH_MOVABLE
Huge pages are not movable so are not allocated from ZONE_MOVABLE. However, as ZONE_MOVABLE will always have pages that can be migrated or reclaimed, it can be used to satisfy hugepage allocations even when the system has been running a long time. This allows an administrator to resize the hugepage pool at runtime depending on the size of ZONE_MOVABLE. This patch adds a new sysctl called hugepages_treat_as_movable. When a non-zero value is written to it, future allocations for the huge page pool will use ZONE_MOVABLE. Despite huge pages being non-movable, we do not introduce additional external fragmentation of note as huge pages are always the largest contiguous block we care about. [akpm@linux-foundation.org: various fixes] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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