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FromAndi Kleen <>
Subject[PATCH] [10/31] HWPOISON: comment dirty swapcache pages
DateTue, 8 Dec 2009 22:16:26 +0100 (CET)

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

AK: Improve comment

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
mm/memory.c | 4 ++++
1 file changed, 4 insertions(+)
Index: linux/mm/memory.c
===================================================================
--- linux.orig/mm/memory.c
+++ linux/mm/memory.c
@@ -2540,6 +2540,10 @@ static int do_swap_page(struct mm_struct
ret = VM_FAULT_MAJOR;
count_vm_event(PGMAJFAULT);
} else if (PageHWPoison(page)) {
+ /*
+ * hwpoisoned dirty swapcache pages are kept for killing
+ * owner processes (which may be unknown at hwpoison time)
+ */
ret = VM_FAULT_HWPOISON;
delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
goto out_release;

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