From 396faf0303d273219db5d7eb4a2879ad977ed185 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Tue, 17 Jul 2007 04:03:13 -0700 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mempolicy.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'include/linux/mempolicy.h') diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h index daabb3aa1ec6..e147cf50529f 100644 --- a/include/linux/mempolicy.h +++ b/include/linux/mempolicy.h @@ -159,7 +159,7 @@ extern void mpol_fix_fork_child_flag(struct task_struct *p); extern struct mempolicy default_policy; extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, - unsigned long addr); + unsigned long addr, gfp_t gfp_flags); extern unsigned slab_node(struct mempolicy *policy); extern enum zone_type policy_zone; @@ -256,9 +256,9 @@ static inline void mpol_fix_fork_child_flag(struct task_struct *p) #define set_cpuset_being_rebound(x) do {} while (0) static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, - unsigned long addr) + unsigned long addr, gfp_t gfp_flags) { - return NODE_DATA(0)->node_zonelists + gfp_zone(GFP_HIGHUSER); + return NODE_DATA(0)->node_zonelists + gfp_zone(gfp_flags); } static inline int do_migrate_pages(struct mm_struct *mm, -- cgit v1.2.2