[PATCH 08 of 11] stop useless vm trashing while we wait the TIF_MEMDIE task to exit

[Andrea Arcangeli <andrea@cpushare.com>]

# HG changeset patch
# User Andrea Arcangeli <andrea@suse.de>
# Date 1199325610 -3600
# Node ID 59c2caaf27ab2eba9aaaab7f9a06089bf164f22f
# Parent  686a1129469a1bad96745705ffe1567146bae222
stop useless vm trashing while we wait the TIF_MEMDIE task to exit

There's no point in trying to free memory if we're oom.

Signed-off-by: Andrea Arcangeli <andrea@suse.de>

diff --git a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1129,6 +1129,13 @@ static unsigned long shrink_zone(int pri
 		nr_inactive = 0;
 
 	while (nr_active || nr_inactive) {
+		if (unlikely(zone_is_oom_locked(zone))) {
+			if (!test_thread_flag(TIF_MEMDIE))
+				/* get out of the way */
+				schedule_timeout_interruptible(1);
+			else
+				break;
+		}
 		if (nr_active) {
 			nr_to_scan = min(nr_active,
 					(unsigned long)sc->swap_cluster_max);

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