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authorMel Gorman <mel@csn.ul.ie>2007-10-16 01:25:53 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:00 -0700
commite010487dbe09d63cf916fd1b119d17abd0f48207 (patch)
tree37c7f36913daf4bc0a68a1d0ba1cc30ee0d4e307 /include
parente12ba74d8ff3e2f73a583500d7095e406df4d093 (diff)
downloadop-kernel-dev-e010487dbe09d63cf916fd1b119d17abd0f48207.zip
op-kernel-dev-e010487dbe09d63cf916fd1b119d17abd0f48207.tar.gz
Group high-order atomic allocations
In rare cases, the kernel needs to allocate a high-order block of pages without sleeping. For example, this is the case with e1000 cards configured to use jumbo frames. Migrating or reclaiming pages in this situation is not an option. This patch groups these allocations together as much as possible by adding a new MIGRATE_TYPE. The MIGRATE_HIGHATOMIC type are exactly what they sound like. Care is taken that pages of other migrate types do not use the same blocks as high-order atomic allocations. 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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 4721e9a..a8140a9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -37,11 +37,13 @@
#define MIGRATE_UNMOVABLE 0
#define MIGRATE_RECLAIMABLE 1
#define MIGRATE_MOVABLE 2
-#define MIGRATE_TYPES 3
+#define MIGRATE_HIGHATOMIC 3
+#define MIGRATE_TYPES 4
#else
#define MIGRATE_UNMOVABLE 0
#define MIGRATE_UNRECLAIMABLE 0
#define MIGRATE_MOVABLE 0
+#define MIGRATE_HIGHATOMIC 0
#define MIGRATE_TYPES 1
#endif
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