From 588f9ce6ca61ecb4663ee6ef2f75d2d96c73151e Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 16 Dec 2009 12:19:57 +0100 Subject: 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 --- mm/memory-failure.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'mm') diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 50d4f8d7024a..38fcbb22eab9 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -82,6 +82,28 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno, return ret; } +/* + * 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. -- cgit v1.2.2