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authorAndi Kleen <andi@firstfloor.org>2009-12-16 12:20:00 +0100
committerAndi Kleen <ak@linux.intel.com>2009-12-16 12:20:00 +0100
commitfacb6011f3993947283fa15d039dacb4ad140230 (patch)
treec317e401fa7c867e1652879627163331f43085ef /include/linux/mm.h
parent2326c467df4ff814dc07cf1bdaa1e6e0a9c9f21c (diff)
HWPOISON: Add soft page offline support
This is a simpler, gentler variant of memory_failure() for soft page offlining controlled from user space. It doesn't kill anything, just tries to invalidate and if that doesn't work migrate the page away. This is useful for predictive failure analysis, where a page has a high rate of corrected errors, but hasn't gone bad yet. Instead it can be offlined early and avoided. The offlining is controlled from sysfs, including a new generic entry point for hard page offlining for symmetry too. We use the page isolate facility to prevent re-allocation race. Normally this is only used by memory hotplug. To avoid races with memory allocation I am using lock_system_sleep(). This avoids the situation where memory hotplug is about to isolate a page range and then hwpoison undoes that work. This is a big hammer currently, but the simplest solution currently. When the page is not free or LRU we try to free pages from slab and other caches. The slab freeing is currently quite dumb and does not try to focus on the specific slab cache which might own the page. This could be potentially improved later. Thanks to Fengguang Wu and Haicheng Li for some fixes. [Added fix from Andrew Morton to adapt to new migrate_pages prototype] Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r--include/linux/mm.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8cdb941fc7b..849b4a61bd8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1339,8 +1339,9 @@ extern int __memory_failure(unsigned long pfn, int trapno, int flags);
extern int unpoison_memory(unsigned long pfn);
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
-extern void shake_page(struct page *p);
+extern void shake_page(struct page *p, int access);
extern atomic_long_t mce_bad_pages;
+extern int soft_offline_page(struct page *page, int flags);
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */