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Allow huge page allocations to use GFP_HIGH_MOVABLE

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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>
This commit is contained in:
Mel Gorman
2007-07-17 04:03:13 -07:00
committed by Linus Torvalds
parent 2a1e274acf
commit 396faf0303
5 changed files with 36 additions and 8 deletions
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include/linux/mempolicy.h
+3 -3
View File
@@ -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,