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author | Mel Gorman <mel@csn.ul.ie> | 2007-07-17 15:03:13 +0400 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 21:22:59 +0400 |
commit | 396faf0303d273219db5d7eb4a2879ad977ed185 (patch) | |
tree | 96cb64fd6713ef7a924f4f878e259aea781f079a /Documentation/sysctl | |
parent | 2a1e274acf0b1c192face19a4be7c12d4503eaaf (diff) | |
download | linux-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>
Diffstat (limited to 'Documentation/sysctl')
0 files changed, 0 insertions, 0 deletions