[PATCH] memcg,thp: fix res_counter:96 regression

[Hugh Dickins <hughd@google.com>]

Occasionally, testing memcg's move_charge_at_immigrate on rc7 shows
a flurry of hundreds of warnings at kernel/res_counter.c:96, where
res_counter_uncharge_locked() does WARN_ON(counter->usage < val).

The first trace of each flurry implicates __mem_cgroup_cancel_charge()
of mc.precharge, and an audit of mc.precharge handling points to
mem_cgroup_move_charge_pte_range()'s THP handling in 12724850e806
"memcg: avoid THP split in task migration".

Checking !mc.precharge is good everywhere else, when a single page is
to be charged; but here the "mc.precharge -= HPAGE_PMD_NR" likely to
follow, is liable to result in underflow (a lot can change since the
precharge was estimated).

Simply check against HPAGE_PMD_NR: there's probably a better alternative,
trying precharge for more, splitting if unsuccessful; but this one-liner
is safer for now - no kernel/res_counter.c:96 warnings seen in 26 hours.

Signed-off-by: Hugh Dickins <hughd@google.com>
---

 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 3.4-rc7/mm/memcontrol.c	2012-05-12 22:56:05.340002552 -0700
+++ linux/mm/memcontrol.c	2012-05-17 09:39:45.944034396 -0700
@@ -5481,7 +5481,7 @@ static int mem_cgroup_move_charge_pte_ra
 	 *    part of thp split is not executed yet.
 	 */
 	if (pmd_trans_huge_lock(pmd, vma) == 1) {
-		if (!mc.precharge) {
+		if (mc.precharge < HPAGE_PMD_NR) {
 			spin_unlock(&vma->vm_mm->page_table_lock);
 			return 0;
 		}

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