[PATCH 4/4] HWPOISON: Stop shrinking at right page count

Andi Kleen
2010-10-06T20:49:18Z

From: Andi Kleen <ak@linux.intel.com>

When we call the slab shrinker to free a page we need to stop at
page count one because the caller always holds a single reference, not zero.

This avoids useless looping over slab shrinkers and freeing too much
memory.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
mm/memory-failure.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 886144b..7c1af9b 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -237,7 +237,7 @@ void shake_page(struct page *p, int access)
int nr;
do {
nr = shrink_slab(1000, GFP_KERNEL, 1000);
- if (page_count(p) == 0)
+ if (page_count(p) == 1)
break;
} while (nr > 10);
}
--
1.7.1