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| author | Mel Gorman <mel@csn.ul.ie> | 2007-10-16 01:26:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:00 -0700 |
| commit | 467c996c1e1910633fa8e7adc9b052aa3ed5f97c (patch) | |
| tree | 09e0e70160386be1bdaa12801afddf287e12c8a1 /include | |
| parent | d9c2340052278d8eb2ffb16b0484f8f794def4de (diff) | |
| download | lwn-467c996c1e1910633fa8e7adc9b052aa3ed5f97c.tar.gz lwn-467c996c1e1910633fa8e7adc9b052aa3ed5f97c.zip | |
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.h | 12 | ||||
| -rw-r--r-- | include/linux/mmzone.h | 10 |
2 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h index f8ffcd401c5f..7e93a9ae7064 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 87a4045580f2..20ea42c45e4a 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; |