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authorDavid Rientjes <rientjes@google.com>2008-11-12 13:25:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-12 17:17:16 -0800
commite33c3b5e172e2e45456f42fba47227d48745543f (patch)
tree0dc15f10c63b36b12de1dee6b3b70108286a5058 /mm
parentf0f7e0dc7393268947dc3ed285defc3d375487b9 (diff)
downloadlinux-2.6.34-ux500-e33c3b5e172e2e45456f42fba47227d48745543f.tar.gz
cpusets: update mems allowed in page allocator
If all allowable memory is unreclaimable, it is possible to loop forever in the page allocator for ~__GFP_NORETRY allocations. During this time, it is also possible for a task's cpuset to expand its set of allowable nodes so that it now includes free memory. The cached copy of this set, current->mems_allowed, is stale, however, since there has not been a subsequent call to cpuset_update_task_memory_state(). The cached copy of the set of allowable nodes is now updated in the page allocator's slow path so the additional memory is available to get_page_from_freelist(). [akpm@linux-foundation.org: add comment] Signed-off-by: David Rientjes <rientjes@google.com> Cc: Paul Menage <menage@google.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: 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 'mm')
-rw-r--r--mm/page_alloc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 54069e64e3a..d8ac0147456 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1561,6 +1561,10 @@ nofail_alloc:
/* We now go into synchronous reclaim */
cpuset_memory_pressure_bump();
+ /*
+ * The task's cpuset might have expanded its set of allowable nodes
+ */
+ cpuset_update_task_memory_state();
p->flags |= PF_MEMALLOC;
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;