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Subject[PATCH] [2/31] HWPOISON: Be more aggressive at freeing non LRU caches
Date

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>

---
include/linux/mm.h | 1 +
mm/memory-failure.c | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+)

Index: linux/mm/memory-failure.c
===================================================================
--- linux.orig/mm/memory-failure.c
+++ linux/mm/memory-failure.c
@@ -83,6 +83,28 @@ static int kill_proc_ao(struct task_stru
}

/*
+ * 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.
*
Index: linux/include/linux/mm.h
===================================================================
--- linux.orig/include/linux/mm.h
+++ linux/include/linux/mm.h
@@ -1320,6 +1320,7 @@ extern void memory_failure(unsigned long
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__ */

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