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authorMel Gorman <mel@csn.ul.ie>2007-10-16 01:26:02 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:00 -0700
commit467c996c1e1910633fa8e7adc9b052aa3ed5f97c (patch)
tree09e0e70160386be1bdaa12801afddf287e12c8a1 /include
parentd9c2340052278d8eb2ffb16b0484f8f794def4de (diff)
downloadop-kernel-dev-467c996c1e1910633fa8e7adc9b052aa3ed5f97c.zip
op-kernel-dev-467c996c1e1910633fa8e7adc9b052aa3ed5f97c.tar.gz
Print out statistics in relation to fragmentation avoidance to /proc/pagetypeinfo
This patch provides fragmentation avoidance statistics via /proc/pagetypeinfo. The information is collected only on request so there is no runtime overhead. The statistics are in three parts: The first part prints information on the size of blocks that pages are being grouped on and looks like Page block order: 10 Pages per block: 1024 The second part is a more detailed version of /proc/buddyinfo and looks like Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 Node 0, zone DMA, type Unmovable 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Reclaimable 1 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Movable 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Reserve 0 4 4 0 0 0 0 1 0 1 0 Node 0, zone Normal, type Unmovable 111 8 4 4 2 3 1 0 0 0 0 Node 0, zone Normal, type Reclaimable 293 89 8 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Movable 1 6 13 9 7 6 3 0 0 0 0 Node 0, zone Normal, type Reserve 0 0 0 0 0 0 0 0 0 0 4 The third part looks like Number of blocks type Unmovable Reclaimable Movable Reserve Node 0, zone DMA 0 1 2 1 Node 0, zone Normal 3 17 94 4 To walk the zones within a node with interrupts disabled, walk_zones_in_node() is introduced and shared between /proc/buddyinfo, /proc/zoneinfo and /proc/pagetypeinfo to reduce code duplication. It seems specific to what vmstat.c requires but could be broken out as a general utility function in mmzone.c if there were other other potential users. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Andy Whitcroft <apw@shadowen.org> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/gfp.h12
-rw-r--r--include/linux/mmzone.h10
2 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index f8ffcd4..7e93a9a 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -104,6 +104,18 @@ struct vm_area_struct;
/* 4GB DMA on some platforms */
#define GFP_DMA32 __GFP_DMA32
+/* Convert GFP flags to their corresponding migrate type */
+static inline int allocflags_to_migratetype(gfp_t gfp_flags)
+{
+ WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
+
+ if (unlikely(page_group_by_mobility_disabled))
+ return MIGRATE_UNMOVABLE;
+
+ /* Group based on mobility */
+ return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
+ ((gfp_flags & __GFP_RECLAIMABLE) != 0);
+}
static inline enum zone_type gfp_zone(gfp_t flags)
{
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 87a4045..20ea42c 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -43,6 +43,16 @@
for (order = 0; order < MAX_ORDER; order++) \
for (type = 0; type < MIGRATE_TYPES; type++)
+extern int page_group_by_mobility_disabled;
+
+static inline int get_pageblock_migratetype(struct page *page)
+{
+ if (unlikely(page_group_by_mobility_disabled))
+ return MIGRATE_UNMOVABLE;
+
+ return get_pageblock_flags_group(page, PB_migrate, PB_migrate_end);
+}
+
struct free_area {
struct list_head free_list[MIGRATE_TYPES];
unsigned long nr_free;
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