netdev - Re: [PATCH v3 4/7] per-cgroup tcp buffers control

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Date:	Mon, 26 Sep 2011 19:48:15 -0300
From:	Glauber Costa <glommer@...allels.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	<linux-kernel@...r.kernel.org>, <paul@...lmenage.org>,
	<lizf@...fujitsu.com>, <ebiederm@...ssion.com>,
	<davem@...emloft.net>, <gthelen@...gle.com>,
	<netdev@...r.kernel.org>, <linux-mm@...ck.org>,
	<kirill@...temov.name>
Subject: Re: [PATCH v3 4/7] per-cgroup tcp buffers control

On 09/26/2011 07:59 AM, KAMEZAWA Hiroyuki wrote:
> On Sun, 18 Sep 2011 21:56:42 -0300
> Glauber Costa<glommer@...allels.com>  wrote:
>
>> With all the infrastructure in place, this patch implements
>> per-cgroup control for tcp memory pressure handling.
>>
>> Signed-off-by: Glauber Costa<glommer@...allels.com>
>> CC: David S. Miller<davem@...emloft.net>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@...fujitsu.com>
>> CC: Eric W. Biederman<ebiederm@...ssion.com>
>
> a comment below.
>
>> +int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
>> +		    struct cgroup_subsys *ss)
>> +{
>> +	struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
>> +	unsigned long limit;
>> +
>> +	cg->tcp_memory_pressure = 0;
>> +	atomic_long_set(&cg->tcp_memory_allocated, 0);
>> +	percpu_counter_init(&cg->tcp_sockets_allocated, 0);
>> +
>> +	limit = nr_free_buffer_pages() / 8;
>> +	limit = max(limit, 128UL);
>> +
>> +	cg->tcp_prot_mem[0] = sysctl_tcp_mem[0];
>> +	cg->tcp_prot_mem[1] = sysctl_tcp_mem[1];
>> +	cg->tcp_prot_mem[2] = sysctl_tcp_mem[2];
>> +
>
> Then, the parameter doesn't inherit parent's one ?
>
> I think sockets_populate should pass 'parent' and
>
>
> I think you should have a function
>
>      mem_cgroup_should_inherit_parent_settings(parent)
>
> (This is because you made this feature as a part of memcg.
>   please provide expected behavior.)
>
All right Kame, will do.
Thanks.


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