[PATCH 2/2] HWPOISON: Attempt directed shrinking of slabs

[Andi Kleen <andi@firstfloor.org>]

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

When a slab page is found try to shrink the specific slab first
before trying to shrink all slabs and call other shrinkers.
This can be done now using the new kmem_page_cache() call.

Cc: fengguang.wu@intel.com
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 mm/memory-failure.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 9c26eec..b49d81a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -212,6 +212,20 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno,
 	return ret;
 }
 
+/* 
+ * Try to free a slab page by shrinking the slab.
+ */
+static int shake_slab(struct page *p)
+{
+	struct kmem_cache *cache;
+
+	cache = kmem_page_cache(p);
+	if (!cache)
+		return 0;
+	kmem_cache_shrink(cache);
+	return page_count(p) == 1;
+}
+
 /*
  * When a unknown page type is encountered drain as many buffers as possible
  * in the hope to turn the page into a LRU or free page, which we can handle.
@@ -233,6 +247,10 @@ void shake_page(struct page *p, int access)
 	 */
 	if (access) {
 		int nr;
+
+		if (shake_slab(p))
+			return;
+
 		do {
 			nr = shrink_slab(1000, GFP_KERNEL, 1000);
 			if (page_count(p) == 0)
-- 
1.7.1

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