From: Mel Gorman <mel@csn.ul.ie>
Date: Tue, 15 Dec 2009 01:59:56 +0000 (-0800)
Subject: hugetlb: abort a hugepage pool resize if a signal is pending
X-Git-Tag: tegra-10.11.0~3792
X-Git-Url: http://nv-tegra.nvidia.com/gitweb/?p=linux-2.6.git;a=commitdiff_plain;h=536240f2bde98216feac87b4891d19a536b8884a;hp=6927c1dd93fc982140f3a3742ac4b224cd3e02b2

hugetlb: abort a hugepage pool resize if a signal is pending

If a user asks for a hugepage pool resize but specified a large number,
the machine can begin trashing.  In response, they might hit ctrl-c but
signals are ignored and the pool resize continues until it fails an
allocation.  This can take a considerable amount of time so this patch
aborts a pool resize if a signal is pending.

Suggested by Dave Hansen.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6df8065..65f38c2 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1278,6 +1278,9 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
 		if (!ret)
 			goto out;
 
+		/* Bail for signals. Probably ctrl-c from user */
+		if (signal_pending(current))
+			goto out;
 	}
 
 	/*