From: Glauber Costa <glommer@parallels.com>
To: David Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
lizf@cn.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com,
ebiederm@xmission.com, paul@paulmenage.org, gthelen@google.com,
netdev@vger.kernel.org, linux-mm@kvack.org, kirill@shutemov.name,
avagin@parallels.com, devel@openvz.org
Subject: Re: [PATCH v7 0/8] Request for inclusion: tcp memory buffers
Date: Fri, 14 Oct 2011 00:05:58 +0400 [thread overview]
Message-ID: <4E9744A6.5010101@parallels.com> (raw)
In-Reply-To: <20111013.160031.605700447623532119.davem@davemloft.net>
On 10/14/2011 12:00 AM, David Miller wrote:
> From: Glauber Costa<glommer@parallels.com>
> Date: Thu, 13 Oct 2011 17:09:34 +0400
>
>> This series was extensively reviewed over the past month, and after
>> all major comments were merged, I feel it is ready for inclusion when
>> the next merge window opens. Minor fixes will be provided if they
>> prove to be necessary.
>
> I'm not applying this.
Thank you for letting me now about your view of this that early.
> You're turning inline increments and decrements of the existing memory
> limits into indirect function calls.
Yes, indeed.
> That imposes a new non-trivial cost, in fast paths, even when people
> do not use your feature.
Well, there is a cost, but all past submissions included round trip
benchmarks.
In none of them I could see any significant slowdown.
> Make this evaluate into exactly the same exact code stream we have
> now when the memory cgroup feature is not in use, which will be the
> majority of users.
What exactly do you mean by "not in use" ? Not compiled in or not
actively being exercised ? If you mean the later, I appreciate tips on
how to achieve it.
Also, I kind of dispute the affirmation that !cgroup will encompass
the majority of users, since cgroups is being enabled by default by
most vendors. All systemd based systems use it extensively, for instance.
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next prev parent reply other threads:[~2011-10-13 20:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-13 13:09 Glauber Costa
2011-10-13 13:09 ` [PATCH v7 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
2011-10-13 13:09 ` [PATCH v7 2/8] socket: initial cgroup code Glauber Costa
2011-10-13 13:09 ` [PATCH v7 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
2011-10-13 13:09 ` [PATCH v7 4/8] per-cgroup tcp buffers control Glauber Costa
2011-10-13 13:09 ` [PATCH v7 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
2011-10-13 13:09 ` [PATCH v7 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
2011-10-13 13:09 ` [PATCH v7 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
2011-10-13 13:09 ` [PATCH v7 8/8] Disable task moving when using kernel memory accounting Glauber Costa
2011-10-13 20:00 ` [PATCH v7 0/8] Request for inclusion: tcp memory buffers David Miller
2011-10-13 20:05 ` Glauber Costa [this message]
2011-10-13 20:08 ` David Miller
2011-10-13 20:12 ` David Miller
2011-10-13 20:14 ` Glauber Costa
2011-10-13 20:18 ` David Miller
2011-10-14 12:56 ` Glauber Costa
2011-10-19 21:09 ` David Miller
2011-10-13 20:16 ` David Miller
2011-10-13 20:23 ` Glauber Costa
2011-10-14 2:55 ` Valdis.Kletnieks
2011-10-14 2:12 ` Andi Kleen
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