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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4E812C81.9020909@parallels.com>
Date:	Mon, 26 Sep 2011 22:53:05 -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.)
>
> Thanks,
> -Kame

Kame: Another look into this:

sysctl_tcp_mem is a global value, unless you have different namespaces.
So it is either global anyway, or should come from the namespace, not 
the parent.

Now, the goal here is to set the maximum possible value for those 
fields. That, indeed, should come from the parent.

That's my understanding...

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html