linux-kernel - Re: [PATCH v3 3/4] memcg: optimize memcg_get_hierarchical

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Message-ID: <20120625104357.GB12148@kernel>
Date:	Mon, 25 Jun 2012 18:43:57 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <bsingharora@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mike Frysinger <vapier@...too.org>,
	Arun Sharma <asharma@...com>, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Wanpeng Li <liwp.linux@...il.com>
Subject: Re: [PATCH v3 3/4] memcg: optimize memcg_get_hierarchical_limit

On Mon, Jun 25, 2012 at 06:52:25PM +0900, Kamezawa Hiroyuki wrote:
>(2012/06/25 17:44), Wanpeng Li wrote:
>> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
>> 
>> Optimize memcg_get_hierarchical_limit to save cpu cycle.
>> 
>> Signed-off-by: Wanpeng Li <liwp.linux@...il.com>
>
>I can't understand the benefit of this patch to the real world...
>
>So, if you wrote the patch description as "clean up" rather than optimize,
>ok, I'll agree.
OK, I will change to "Cleanup". Thank you Kame.

Best Regards,
Wanpeng Li

>
>Thanks,
>-Kame
>
>> ---
>>   mm/memcontrol.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index 2e81328..4520b57 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
>> @@ -3917,9 +3917,9 @@ static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
>>   
>>   	min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
>>   	min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
>> -	cgroup = memcg->css.cgroup;
>>   	if (!memcg->use_hierarchy)
>>   		goto out;
>> +	cgroup = memcg->css.cgroup;
>>   
>>   	while (cgroup->parent) {
>>   		cgroup = cgroup->parent;
>> 
>
>
>
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