HWPOISON: Be more aggressive at freeing non LRU caches
shake_page handles more types of page caches than lru_drain_all()
- per cpu page allocator pages
- per CPU LRU
Stops early when the page became free.
Used in followon patches.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 50d4f8d..38fcbb2 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -83,6 +83,28 @@
}
/*
+ * 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.
+ */
+void shake_page(struct page *p)
+{
+ if (!PageSlab(p)) {
+ lru_add_drain_all();
+ if (PageLRU(p))
+ return;
+ drain_all_pages();
+ if (PageLRU(p) || is_free_buddy_page(p))
+ return;
+ }
+ /*
+ * Could call shrink_slab here (which would also
+ * shrink other caches). Unfortunately that might
+ * also access the corrupted page, which could be fatal.
+ */
+}
+EXPORT_SYMBOL_GPL(shake_page);
+
+/*
* Kill all processes that have a poisoned page mapped and then isolate
* the page.
*
