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Commit e33c3b5e authored by David Rientjes's avatar David Rientjes Committed by Linus Torvalds
Browse files

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: default avatarDavid 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f0f7e0dc

mm/page_alloc.c

+4 −0
Original line number Diff line number Diff line
@@ -1561,6 +1561,10 @@ __alloc_pages_internal(gfp_t gfp_mask, unsigned int order, 


	/* 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;