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Group high-order atomic allocations

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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>
This commit is contained in:
Mel Gorman 2007-10-16 01:25:53 -07:00 • committed by Linus Torvalds
parent e12ba74d8f
commit e010487dbe
2 changed files with 33 additions and 7 deletions
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4
include/linux/mmzone.h
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@ -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