From: Glauber Costa <glommer@parallels•com>
To: Jason Baron <jbaron@redhat•com>
Cc: <davem@davemloft•net>, <linux-kernel@vger•kernel.org>,
<paul@paulmenage•org>, <lizf@cn•fujitsu.com>,
<kamezawa.hiroyu@jp•fujitsu.com>, <ebiederm@xmission•com>,
<gthelen@google•com>, <netdev@vger•kernel.org>,
<linux-mm@kvack•org>, <kirill@shutemov•name>,
<avagin@parallels•com>, <devel@openvz•org>,
<eric.dumazet@gmail•com>, <cgroups@vger•kernel.org>
Subject: Re: [PATCH v9 3/9] socket: initial cgroup code.
Date: Fri, 23 Dec 2011 12:57:49 +0400 [thread overview]
Message-ID: <4EF4428D.6010103@parallels.com> (raw)
In-Reply-To: <20111222211028.GB3916@redhat.com>
On 12/23/2011 01:10 AM, Jason Baron wrote:
> On Mon, Dec 12, 2011 at 11:47:03AM +0400, Glauber Costa wrote:
>> +
>> +static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
>> +void sock_update_memcg(struct sock *sk)
>> +{
>> + /* A socket spends its whole life in the same cgroup */
>> + if (sk->sk_cgrp) {
>> + WARN_ON(1);
>> + return;
>> + }
>> + if (static_branch(&memcg_socket_limit_enabled)) {
>> + struct mem_cgroup *memcg;
>> +
>> + BUG_ON(!sk->sk_prot->proto_cgroup);
>> +
>> + rcu_read_lock();
>> + memcg = mem_cgroup_from_task(current);
>> + if (!mem_cgroup_is_root(memcg)) {
>> + mem_cgroup_get(memcg);
>> + sk->sk_cgrp = sk->sk_prot->proto_cgroup(memcg);
>> + }
>> + rcu_read_unlock();
>> + }
>> +}
>> +EXPORT_SYMBOL(sock_update_memcg);
>> +
>> +void sock_release_memcg(struct sock *sk)
>> +{
>> + if (static_branch(&memcg_socket_limit_enabled)&& sk->sk_cgrp) {
>> + struct mem_cgroup *memcg;
>> + WARN_ON(!sk->sk_cgrp->memcg);
>> + memcg = sk->sk_cgrp->memcg;
>> + mem_cgroup_put(memcg);
>> + }
>> +}
>
> Hi Glauber,
>
> I think for 'sock_release_memcg()', you want:
>
> static inline sock_release_memcg(sk)
> {
> if (static_branch())
> __sock_release_memcg();
> }
>
> And then re-define the current sock_release_memcg -> __sock_release_memcg().
> In that way the straight line path is a single no-op. As currently
> written, there is function call and then an immediate return.
>
Hello Jason,
Thanks for the tip. I may be wrong here, but I don't think that the
release performance matters to that level. But your suggestion seems
good nevertheless. Since this is already sitting on a tree, would you
like to send a patch for that?
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next prev parent reply other threads:[~2011-12-23 8:57 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 7:47 [PATCH v9 0/9] Request for inclusion: per-cgroup tcp memory pressure controls Glauber Costa
2011-12-12 7:47 ` [PATCH v9 1/9] Basic kernel memory functionality for the Memory Controller Glauber Costa
2011-12-14 17:04 ` Michal Hocko
[not found] ` <20111214170447.GB4856-VqjxzfR4DlwKmadIfiO5sKVXKuFTiq87@public.gmane.org>
2011-12-15 12:29 ` Glauber Costa
2011-12-16 12:32 ` Michal Hocko
2011-12-16 13:02 ` Glauber Costa
[not found] ` <4EEB417B.8000508-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-12-16 13:30 ` Michal Hocko
[not found] ` <1323676029-5890-2-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-12-16 6:20 ` Greg Thelen
2011-12-12 7:47 ` [PATCH v9 2/9] foundations of per-cgroup memory pressure controlling Glauber Costa
2011-12-12 7:47 ` [PATCH v9 3/9] socket: initial cgroup code Glauber Costa
2011-12-22 21:10 ` Jason Baron
2011-12-23 8:57 ` Glauber Costa [this message]
2011-12-12 7:47 ` [PATCH v9 4/9] tcp memory pressure controls Glauber Costa
2011-12-12 7:47 ` [PATCH v9 5/9] per-netns ipv4 sysctl_tcp_mem Glauber Costa
2011-12-12 7:47 ` [PATCH v9 6/9] tcp buffer limitation: per-cgroup limit Glauber Costa
2011-12-12 7:47 ` [PATCH v9 7/9] Display current tcp memory allocation in kmem cgroup Glauber Costa
2011-12-12 7:47 ` [PATCH v9 8/9] Display current tcp failcnt " Glauber Costa
2011-12-12 7:47 ` [PATCH v9 9/9] Display maximum tcp memory allocation " Glauber Costa
2011-12-13 0:07 ` [PATCH v9 0/9] Request for inclusion: per-cgroup tcp memory pressure controls David Miller
2011-12-13 13:49 ` Christoph Paasch
2011-12-13 13:59 ` Eric Dumazet
2011-12-13 18:45 ` David Miller
2011-12-13 20:11 ` Glauber Costa
2011-12-15 5:40 ` KAMEZAWA Hiroyuki
2011-12-15 5:48 ` David Miller
2011-12-15 6:48 ` Glauber Costa
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