mm/memory-failure.c: fix page isolated count mismatch

5db8a73a · Minchan Kim <[email protected]> · 2011-06-15 15:08:48 -07:00

Pages isolated for migration are accounted with the vmstat counters
NR_ISOLATE_[ANON|FILE].  Callers of migrate_pages() are expected to
increment these counters when pages are isolated from the LRU.  Once the
pages have been migrated, they are put back on the LRU or freed and the
isolated count is decremented.

Memory failure is not properly accounting for pages it isolates causing
the NR_ISOLATED counters to be negative.  On SMP builds, this goes
unnoticed as negative counters are treated as 0 due to expected per-cpu
drift.  On UP builds, the counter is treated by too_many_isolated() as a
large value causing processes to enter D state during page reclaim or
compaction.  This patch accounts for pages isolated by memory failure
correctly.

[[email protected]: rewrote changelog]
Reviewed-by: Andrea Arcangeli <[email protected]>
Signed-off-by: Minchan Kim <[email protected]>
Cc: Andi Kleen <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 5db8a73a8d7cc6a66afbf25ed7fda338caa8f5f9
Parents: d2c32258

Changes

1 files changed · +3 −1

File	Status	Add	Del	Content
mm/memory-failure.c	modified	+3	−1	View file

mm/memory-failure.c

View file

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 5c8f7e0..eac0ba5 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -52,6 +52,7 @@
 #include <linux/swapops.h>
 #include <linux/hugetlb.h>
 #include <linux/memory_hotplug.h>
+#include <linux/mm_inline.h>
 #include "internal.h"
 
 int sysctl_memory_failure_early_kill __read_mostly = 0;
@@ -1468,7 +1469,8 @@ int soft_offline_page(struct page *page, int flags)
 	put_page(page);
 	if (!ret) {
 		LIST_HEAD(pagelist);
-
+		inc_zone_page_state(page, NR_ISOLATED_ANON +
+					    page_is_file_cache(page));
 		list_add(&page->lru, &pagelist);
 		ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
 								0, true);