diff options
| author | Mel Gorman <mel@csn.ul.ie> | 2007-07-17 13:03:13 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 19:22:59 +0200 |
| commit | 396faf0303d273219db5d7eb4a2879ad977ed185 (patch) | |
| tree | 96cb64fd6713ef7a924f4f878e259aea781f079a /mm/mempolicy.c | |
| parent | Create the ZONE_MOVABLE zone (diff) | |
| download | linux-396faf0303d273219db5d7eb4a2879ad977ed185.tar.xz linux-396faf0303d273219db5d7eb4a2879ad977ed185.zip | |
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 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 4c0f99996811..9f4e9b95e8f2 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1203,7 +1203,8 @@ static inline unsigned interleave_nid(struct mempolicy *pol, #ifdef CONFIG_HUGETLBFS /* Return a zonelist suitable for a huge page allocation. */ -struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr) +struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, + gfp_t gfp_flags) { struct mempolicy *pol = get_vma_policy(current, vma, addr); @@ -1211,7 +1212,7 @@ struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr) unsigned nid; nid = interleave_nid(pol, vma, addr, HPAGE_SHIFT); - return NODE_DATA(nid)->node_zonelists + gfp_zone(GFP_HIGHUSER); + return NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_flags); } return zonelist_policy(GFP_HIGHUSER, pol); } |