[BUGFIX][PATCH v2] memcg: fix thresholds with use_hierarchy == 1

[BUGFIX][PATCH v2] memcg: fix thresholds with use_hierarchy == 1

[Kirill A. Shutsemov]

From: Kirill A. Shutemov <kirill@shutemov.name>

We need to check parent's thresholds if parent has use_hierarchy == 1 to
be sure that parent's threshold events will be triggered even if parent
itself is not active (no MEM_CGROUP_EVENTS).

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
---
 mm/memcontrol.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3eed583..df40eaf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3587,9 +3587,13 @@ unlock:
 
 static void mem_cgroup_threshold(struct mem_cgroup *memcg)
 {
-	__mem_cgroup_threshold(memcg, false);
-	if (do_swap_account)
-		__mem_cgroup_threshold(memcg, true);
+	while (memcg) {
+		__mem_cgroup_threshold(memcg, false);
+		if (do_swap_account)
+			__mem_cgroup_threshold(memcg, true);
+
+		memcg =  parent_mem_cgroup(memcg);
+	}
 }
 
 static int compare_thresholds(const void *a, const void *b)
-- 
1.7.2.3

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Re: [BUGFIX][PATCH v2] memcg: fix thresholds with use_hierarchy == 1

[Daisuke Nishimura]

On Thu, 30 Sep 2010 13:16:32 +0300
"Kirill A. Shutsemov" <kirill@shutemov.name> wrote:

> From: Kirill A. Shutemov <kirill@shutemov.name>
> 
> We need to check parent's thresholds if parent has use_hierarchy == 1 to
> be sure that parent's threshold events will be triggered even if parent
> itself is not active (no MEM_CGROUP_EVENTS).
> 
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>

	Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>

Thanks,
Daisuke Nishimura.

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Re: [BUGFIX][PATCH v2] memcg: fix thresholds with use_hierarchy == 1

[KAMEZAWA Hiroyuki]

On Thu, 30 Sep 2010 13:16:32 +0300
"Kirill A. Shutsemov" <kirill@shutemov.name> wrote:

> From: Kirill A. Shutemov <kirill@shutemov.name>
> 
> We need to check parent's thresholds if parent has use_hierarchy == 1 to
> be sure that parent's threshold events will be triggered even if parent
> itself is not active (no MEM_CGROUP_EVENTS).
> 
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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Re: [BUGFIX][PATCH v2] memcg: fix thresholds with use_hierarchy == 1

[Balbir Singh]

* Kirill A. Shutsemov <kirill@shutemov.name> [2010-09-30 13:16:32]:

> From: Kirill A. Shutemov <kirill@shutemov.name>
> 
> We need to check parent's thresholds if parent has use_hierarchy == 1 to
> be sure that parent's threshold events will be triggered even if parent
> itself is not active (no MEM_CGROUP_EVENTS).
> 
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
> ---
>  mm/memcontrol.c |   10 +++++++---
>  1 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3eed583..df40eaf 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3587,9 +3587,13 @@ unlock:
> 
>  static void mem_cgroup_threshold(struct mem_cgroup *memcg)
>  {
> -	__mem_cgroup_threshold(memcg, false);
> -	if (do_swap_account)
> -		__mem_cgroup_threshold(memcg, true);
> +	while (memcg) {
> +		__mem_cgroup_threshold(memcg, false);
> +		if (do_swap_account)
> +			__mem_cgroup_threshold(memcg, true);
> +
> +		memcg =  parent_mem_cgroup(memcg);
> +	}
>  }
>

Good catch!

 
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
 

-- 
	Three Cheers,
	Balbir

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