From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
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@xxxxxxxxx
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
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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