The patch titled
Subject: memcg: make threshold index in the right position
has been added to the -mm tree. Its filename is
memcg-make-threshold-index-in-the-right-position.patch
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From: Sha Zhengju <handai.szj@xxxxxxxxxx>
Subject: memcg: make threshold index in the right position
Index current_threshold may point to threshold that just equal to usage
after last call of __mem_cgroup_threshold. But after registering a new
event, it will change (pointing to threshold just below usage). So make
it consistent here.
For example:
now:
threshold array: 3 [5] 7 9 (usage = 6, [index] = 5)
next turn (after calling __mem_cgroup_threshold):
threshold array: 3 5 [7] 9 (usage = 7, [index] = 7)
after registering a new event (threshold = 10):
threshold array: 3 [5] 7 9 10 (usage = 7, [index] = 5)
Signed-off-by: Sha Zhengju <handai.szj@xxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Reviewed-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff -puN mm/memcontrol.c~memcg-make-threshold-index-in-the-right-position mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-make-threshold-index-in-the-right-position
+++ a/mm/memcontrol.c
@@ -181,7 +181,7 @@ 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;
@@ -4267,7 +4267,7 @@ static void __mem_cgroup_threshold(struc
usage = mem_cgroup_usage(memcg, swap);
/*
- * current_threshold points to threshold just below usage.
+ * current_threshold points to threshold just below or equal to usage.
* If it's not true, a threshold was crossed after last
* call of __mem_cgroup_threshold().
*/
@@ -4393,14 +4393,15 @@ static int mem_cgroup_usage_register_eve
/* 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
* it here.
*/
++new->current_threshold;
- }
+ } else
+ break;
}
/* Free old spare buffer and save old primary buffer as spare */
_
Subject: Subject: memcg: make threshold index in the right position
Patches currently in -mm which might be from handai.szj@xxxxxxxxxx are
memcg-make-threshold-index-in-the-right-position.patch
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