From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx112.postini.com [74.125.245.112]) by kanga.kvack.org (Postfix) with SMTP id E1A756B0078 for ; Tue, 20 Nov 2012 23:11:36 -0500 (EST) Received: from m3.gw.fujitsu.co.jp (unknown [10.0.50.73]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id D730D3EE0AE for ; Wed, 21 Nov 2012 13:11:34 +0900 (JST) Received: from smail (m3 [127.0.0.1]) by outgoing.m3.gw.fujitsu.co.jp (Postfix) with ESMTP id AE86E45DEBC for ; Wed, 21 Nov 2012 13:11:34 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (s3.gw.fujitsu.co.jp [10.0.50.93]) by m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 964B045DEB6 for ; Wed, 21 Nov 2012 13:11:34 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 78D711DB8041 for ; Wed, 21 Nov 2012 13:11:34 +0900 (JST) Received: from m1000.s.css.fujitsu.com (m1000.s.css.fujitsu.com [10.240.81.136]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 20B811DB803C for ; Wed, 21 Nov 2012 13:11:34 +0900 (JST) Message-ID: <50AC545F.5080303@jp.fujitsu.com> Date: Wed, 21 Nov 2012 13:11:11 +0900 From: Kamezawa Hiroyuki MIME-Version: 1.0 Subject: Re: [patch] mm, memcg: avoid unnecessary function call when memcg is disabled fix References: <20121120134932.055bc192.akpm@linux-foundation.org> <50AC282A.4070309@jp.fujitsu.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: Andrew Morton , Johannes Weiner , Michal Hocko , Hugh Dickins , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org (2012/11/21 11:48), David Rientjes wrote: > Move the check for !mm out of line as suggested by Andrew. > > Signed-off-by: David Rientjes Thank you very much ! Acked-by: KAMEZAWA Hiroyuki > --- > include/linux/memcontrol.h | 2 +- > mm/memcontrol.c | 3 +++ > 2 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h > --- a/include/linux/memcontrol.h > +++ b/include/linux/memcontrol.h > @@ -185,7 +185,7 @@ void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); > static inline void mem_cgroup_count_vm_event(struct mm_struct *mm, > enum vm_event_item idx) > { > - if (mem_cgroup_disabled() || !mm) > + if (mem_cgroup_disabled()) > return; > __mem_cgroup_count_vm_event(mm, idx); > } > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -1021,6 +1021,9 @@ void __mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx) > { > struct mem_cgroup *memcg; > > + if (!mm) > + return; > + > rcu_read_lock(); > memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); > if (unlikely(!memcg)) > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org