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Subject[PATCH] [28/31] HWPOISON: Use new shake_page in memory_failure
Date

shake_page handles more types of page caches than
the much simpler lru_add_drain_all:

- slab (quite inefficiently for now)
- any other caches with a shrinker callback
- per cpu page allocator pages
- per CPU LRU

Use this call to try to turn pages into free or LRU pages.
Then handle the case of the page becoming free after drain everything.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
mm/memory-failure.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

Index: linux/mm/memory-failure.c
===================================================================
--- linux.orig/mm/memory-failure.c
+++ linux/mm/memory-failure.c
@@ -934,8 +934,15 @@ int __memory_failure(unsigned long pfn,
* walked by the page reclaim code, however that's not a big loss.
*/
if (!PageLRU(p))
- lru_add_drain_all();
+ shake_page(p);
if (!PageLRU(p)) {
+ /*
+ * shake_page could have turned it free.
+ */
+ if (is_free_buddy_page(p)) {
+ action_result(pfn, "free buddy, 2nd try", DELAYED);
+ return 0;
+ }
action_result(pfn, "non LRU", IGNORED);
put_page(p);
return -EBUSY;

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