[PATCH 8/8] mm: Give up allocation if the task have fatal signal

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

In OOM case, almost processes may be in vmscan. There isn't any reason
the killed process continue allocation. process exiting free lots pages
rather than greedy vmscan.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
 mm/page_alloc.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ca9cae1..8a9cbaa 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1878,6 +1878,14 @@ rebalance:
 		goto got_pg;
 
 	/*
+	 * If the allocation is for userland page and we have fatal signal,
+	 * there isn't any reason to continue allocation. instead, the task
+	 * should exit soon.
+	 */
+	if (fatal_signal_pending(current) && (gfp_mask & __GFP_HIGHMEM))
+		goto nopage;
+
+	/*
 	 * If we failed to make any progress reclaiming, then we are
 	 * running out of options and have to consider going OOM
 	 */
-- 
1.6.5.2



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