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Commit 588f9ce6 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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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: default avatarAndi Kleen <ak@linux.intel.com>
parent 7bc98b97

include/linux/mm.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -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 __memory_failure(unsigned long pfn, int trapno, int ref);

extern int sysctl_memory_failure_early_kill;

extern int sysctl_memory_failure_early_kill;

extern int sysctl_memory_failure_recovery;

extern int sysctl_memory_failure_recovery;

extern void shake_page(struct page *p);

extern atomic_long_t mce_bad_pages;

extern atomic_long_t mce_bad_pages;





#endif /* __KERNEL__ */

#endif /* __KERNEL__ */

mm/memory-failure.c

+22 −0
Original line number Original line Diff line number Diff line
@@ -82,6 +82,28 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno, 
	return ret;

	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

 * Kill all processes that have a poisoned page mapped and then isolate

 * the page.

 * the page.