HWPOISON: comment dirty swapcache pages
Wu Fengguang [Wed, 16 Dec 2009 11:19:58 +0000 (12:19 +0100)]
AK: Improve comment

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

mm/memory.c

index a54b2c4..db09106 100644 (file)
@@ -2553,6 +2553,10 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
                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;