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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:47:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:46 -0800
commit5a03b051ed87e72b959f32a86054e1142ac4cf55 (patch)
tree31f0e8efb86d48b0292f8a7ea4bd9cf7c930a0ab /include/linux/compaction.h
parent878aee7d6b5504e01b9caffce080e792b6b8d090 (diff)
downloadop-kernel-dev-5a03b051ed87e72b959f32a86054e1142ac4cf55.zip
op-kernel-dev-5a03b051ed87e72b959f32a86054e1142ac4cf55.tar.gz
thp: use compaction in kswapd for GFP_ATOMIC order > 0
This takes advantage of memory compaction to properly generate pages of order > 0 if regular page reclaim fails and priority level becomes more severe and we don't reach the proper watermarks. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compaction.h')
-rw-r--r--include/linux/compaction.h11
1 files changed, 8 insertions, 3 deletions
diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index 72cba40..dfa2ed4 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -11,6 +11,9 @@
/* The full zone was compacted */
#define COMPACT_COMPLETE 3
+#define COMPACT_MODE_DIRECT_RECLAIM 0
+#define COMPACT_MODE_KSWAPD 1
+
#ifdef CONFIG_COMPACTION
extern int sysctl_compact_memory;
extern int sysctl_compaction_handler(struct ctl_table *table, int write,
@@ -25,7 +28,8 @@ extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
bool sync);
extern unsigned long compaction_suitable(struct zone *zone, int order);
extern unsigned long compact_zone_order(struct zone *zone, int order,
- gfp_t gfp_mask, bool sync);
+ gfp_t gfp_mask, bool sync,
+ int compact_mode);
/* Do not skip compaction more than 64 times */
#define COMPACT_MAX_DEFER_SHIFT 6
@@ -70,9 +74,10 @@ static inline unsigned long compaction_suitable(struct zone *zone, int order)
}
static inline unsigned long compact_zone_order(struct zone *zone, int order,
- gfp_t gfp_mask, bool sync)
+ gfp_t gfp_mask, bool sync,
+ int compact_mode)
{
- return 0;
+ return COMPACT_CONTINUE;
}
static inline void defer_compaction(struct zone *zone)
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