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Subject[PATCH] [13/31] HWPOISON: detect free buddy pages explicitly
Date

From: Wu Fengguang <fengguang.wu@intel.com>

Most free pages in the buddy system have no PG_buddy set.
Introduce is_free_buddy_page() for detecting them reliably.

CC: Nick Piggin <npiggin@suse.de>
CC: Mel Gorman <mel@linux.vnet.ibm.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
mm/internal.h | 3 +++
mm/memory-failure.c | 9 +++++++--
mm/page_alloc.c | 21 +++++++++++++++++++++
3 files changed, 31 insertions(+), 2 deletions(-)

Index: linux/mm/memory-failure.c
===================================================================
--- linux.orig/mm/memory-failure.c
+++ linux/mm/memory-failure.c
@@ -809,8 +809,13 @@ int __memory_failure(unsigned long pfn,
*/
if (!(flags & MF_COUNT_INCREASED) &&
!get_page_unless_zero(compound_head(p))) {
- action_result(pfn, "free or high order kernel", IGNORED);
- return PageBuddy(compound_head(p)) ? 0 : -EBUSY;
+ if (is_free_buddy_page(p)) {
+ action_result(pfn, "free buddy", DELAYED);
+ return 0;
+ } else {
+ action_result(pfn, "high order kernel", IGNORED);
+ return -EBUSY;
+ }
}

/*
Index: linux/mm/internal.h
===================================================================
--- linux.orig/mm/internal.h
+++ linux/mm/internal.h
@@ -50,6 +50,9 @@ extern void putback_lru_page(struct page
*/
extern void __free_pages_bootmem(struct page *page, unsigned int order);
extern void prep_compound_page(struct page *page, unsigned long order);
+#ifdef CONFIG_MEMORY_FAILURE
+extern bool is_free_buddy_page(struct page *page);
+#endif


/*
Index: linux/mm/page_alloc.c
===================================================================
--- linux.orig/mm/page_alloc.c
+++ linux/mm/page_alloc.c
@@ -5085,3 +5085,24 @@ __offline_isolated_pages(unsigned long s
spin_unlock_irqrestore(&zone->lock, flags);
}
#endif
+
+#ifdef CONFIG_MEMORY_FAILURE
+bool is_free_buddy_page(struct page *page)
+{
+ struct zone *zone = page_zone(page);
+ unsigned long pfn = page_to_pfn(page);
+ unsigned long flags;
+ int order;
+
+ spin_lock_irqsave(&zone->lock, flags);
+ for (order = 0; order < MAX_ORDER; order++) {
+ struct page *page_head = page - (pfn & ((1 << order) - 1));
+
+ if (PageBuddy(page_head) && page_order(page_head) >= order)
+ break;
+ }
+ spin_unlock_irqrestore(&zone->lock, flags);
+
+ return order < MAX_ORDER;
+}
+#endif

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