linux-kernel - Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup

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Message-ID: <4E89A846.1010200@parallels.com>
Date:	Mon, 3 Oct 2011 16:19:18 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
CC:	<linux-kernel@...r.kernel.org>, <paul@...lmenage.org>,
	<lizf@...fujitsu.com>, <kamezawa.hiroyu@...fujitsu.com>,
	<ebiederm@...ssion.com>, <davem@...emloft.net>,
	<gthelen@...gle.com>, <netdev@...r.kernel.org>,
	<linux-mm@...ck.org>, <avagin@...allels.com>
Subject: Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem
 cgroup

On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
>> This patch introduces kmem.tcp_current_memory file, living in the
>> kmem_cgroup filesystem. It is a simple read-only file that displays the
>> amount of kernel memory currently consumed by the cgroup.
>>
>> 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>
>> ---
>>   Documentation/cgroups/memory.txt |    1 +
>>   mm/memcontrol.c                  |   11 +++++++++++
>>   2 files changed, 12 insertions(+), 0 deletions(-)
>>
>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>> index 1ffde3e..f5a539d 100644
>> --- a/Documentation/cgroups/memory.txt
>> +++ b/Documentation/cgroups/memory.txt
>> @@ -79,6 +79,7 @@ Brief summary of control files.
>>    memory.independent_kmem_limit	 # select whether or not kernel memory limits are
>>   				   independent of user limits
>>    memory.kmem.tcp.max_memory      # set/show hard limit for tcp buf memory
>> + memory.kmem.tcp.current_memory  # show current tcp buf memory allocation
>
> Both are in pages, right?
> Shouldn't it be scaled to bytes and named uniform with other memcg file?
> memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
>
You are absolutely correct.
Since the internal tcp comparison works, I just ended up never noticing 
this.

Thanks.

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