From: Andi Kleen <ak@linux.intel.com>
Date: Tue, 28 Sep 2010 05:37:55 +0000 (+0200)
Subject: HWPOISON: Stop shrinking at right page count
X-Git-Tag: firefly_0821_release~7613^2~3797^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=47f43e7efadacc627f325aba64c6a547de0926db;p=firefly-linux-kernel-4.4.55.git

HWPOISON: Stop shrinking at right page count

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.

Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index cd7e6974de77..757f6b0accfe 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -235,7 +235,7 @@ 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);
 	}