[PATCH] memcg: make threshold index in the right position

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From: Sha Zhengju <handai.szj@xxxxxxxxxx>

Index current_threshold may point to threshold that just equal to
usage after __mem_cgroup_threshold is triggerd. But after registering
a new event, it will change (pointing to threshold just below usage). 
So make it consistent here.

Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Signed-off-by: Sha Zhengju <handai.szj@xxxxxxxxxx>
---
 mm/memcontrol.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 22d94f5..ba46a01 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -183,7 +183,7 @@ struct mem_cgroup_threshold {
 
 /* For threshold */
 struct mem_cgroup_threshold_ary {
-	/* An array index points to threshold just below usage. */
+	/* An array index points to threshold just below or equal to usage. */
 	int current_threshold;
 	/* Size of entries[] */
 	unsigned int size;
@@ -4319,7 +4319,7 @@ static int mem_cgroup_usage_register_event(struct cgroup *cgrp,
 	/* Find current threshold */
 	new->current_threshold = -1;
 	for (i = 0; i < size; i++) {
-		if (new->entries[i].threshold < usage) {
+		if (new->entries[i].threshold <= usage) {
 			/*
 			 * new->current_threshold will not be used until
 			 * rcu_assign_pointer(), so it's safe to increment
-- 
1.7.4.1

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