linux-kernel - [patch] cpusets: update mems allowed in page allocator

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Message-ID: <alpine.DEB.1.10.0810241241520.10168@chino.kir.corp.google.com>
Date:	Fri, 24 Oct 2008 12:42:28 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org
Subject: [patch] 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().

Cc: Paul Menage <menage@...gle.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/page_alloc.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1547,6 +1547,7 @@ nofail_alloc:

 	/* We now go into synchronous reclaim */
 	cpuset_memory_pressure_bump();
+	cpuset_update_task_memory_state();
 	p->flags |= PF_MEMALLOC;
 	reclaim_state.reclaimed_slab = 0;
 	p->reclaim_state = &reclaim_state;
--
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