[PATCH] Fix page isolated count mismatch

From: Minchan Kim
Date: Sun Jun 05 2011 - 01:10:30 EST

If migration is failed, normally we call putback_lru_pages which
It means we should increase NR_ISOLATE_[ANON|FILE] before calling
putback_lru_pages. But soft_offline_page dosn't it.

It can make NR_ISOLATE_[ANON|FILE] with negative value and in UP build
, zone_page_state will say huge isolated pages so too_many_isolated
functions be deceived completely. At last, some process stuck in D state
as it expect while loop ending with congestion_wait.
But it's never ending story.

If it is right, it would be -stable stuff.

Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
mm/memory-failure.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

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)
if (!ret) {
+ 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);

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