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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>
This commit is contained in:
Andi Kleen 2009-12-16 12:19:57 +01:00 committed by Andi Kleen
parent 7bc98b97ed
commit 588f9ce6ca
2 changed files with 23 additions and 0 deletions
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1
include/linux/mm.h
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@ -1335,6 +1335,7 @@ extern void memory_failure(unsigned long pfn, int trapno);
extern int __memory_failure(unsigned long pfn, int trapno, int ref);
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
extern void shake_page(struct page *p);
extern atomic_long_t mce_bad_pages;
#endif /* __KERNEL__ */

22
mm/memory-failure.c
View File

@ -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.