From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id 5F0576B0082 for ; Thu, 21 Jul 2011 19:56:40 -0400 (EDT) Received: from m4.gw.fujitsu.co.jp (unknown [10.0.50.74]) by fgwmail6.fujitsu.co.jp (Postfix) with ESMTP id D1F523EE0BB for ; Fri, 22 Jul 2011 08:56:37 +0900 (JST) Received: from smail (m4 [127.0.0.1]) by outgoing.m4.gw.fujitsu.co.jp (Postfix) with ESMTP id B38EE45DE52 for ; Fri, 22 Jul 2011 08:56:37 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (s4.gw.fujitsu.co.jp [10.0.50.94]) by m4.gw.fujitsu.co.jp (Postfix) with ESMTP id 9BA3345DE4E for ; Fri, 22 Jul 2011 08:56:37 +0900 (JST) Received: from s4.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id 8EE641DB8043 for ; Fri, 22 Jul 2011 08:56:37 +0900 (JST) Received: from m106.s.css.fujitsu.com (m106.s.css.fujitsu.com [10.240.81.146]) by s4.gw.fujitsu.co.jp (Postfix) with ESMTP id 5B2FD1DB8037 for ; Fri, 22 Jul 2011 08:56:37 +0900 (JST) Date: Fri, 22 Jul 2011 08:49:27 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [PATCH 3/4] memcg: get rid of percpu_charge_mutex lock Message-Id: <20110722084927.96b0aa86.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20110721124223.GE27855@tiehlicka.suse.cz> References: <2bfb2b7687c1a6b39da2a04689190725075cc4f8.1311241300.git.mhocko@suse.cz> <20110721193051.cd3266e5.kamezawa.hiroyu@jp.fujitsu.com> <20110721114704.GC27855@tiehlicka.suse.cz> <20110721124223.GE27855@tiehlicka.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: linux-mm@kvack.org, Balbir Singh , Daisuke Nishimura , linux-kernel@vger.kernel.org On Thu, 21 Jul 2011 14:42:23 +0200 Michal Hocko wrote: > On Thu 21-07-11 13:47:04, Michal Hocko wrote: > > On Thu 21-07-11 19:30:51, KAMEZAWA Hiroyuki wrote: > > > On Thu, 21 Jul 2011 09:58:24 +0200 > > > Michal Hocko wrote: > [...] > > > > --- a/mm/memcontrol.c > > > > +++ b/mm/memcontrol.c > > > > @@ -2166,7 +2165,8 @@ static void drain_all_stock(struct mem_cgroup *root_mem, bool sync) > > > > > > > > for_each_online_cpu(cpu) { > > > > struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); > > > > - if (test_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) > > > > + if (root_mem == stock->cached && > > > > + test_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) > > > > flush_work(&stock->work); > > > > > > Doesn't this new check handle hierarchy ? > > > css_is_ancestor() will be required if you do this check. > > > > Yes you are right. Will fix it. I will add a helper for the check. > > Here is the patch with the helper. The above will then read > if (mem_cgroup_same_or_subtree(root_mem, stock->cached)) > > --- > From b963a9f4dac61044daac49700f84b7819d7c2f53 Mon Sep 17 00:00:00 2001 > From: Michal Hocko > Date: Thu, 21 Jul 2011 13:54:13 +0200 > Subject: [PATCH] memcg: add mem_cgroup_same_or_subtree helper > > We are checking whether a given two groups are same or at least in the > same subtree of a hierarchy at several places. Let's make a helper for > it to make code easier to read. > > Signed-off-by: Michal Hocko Acked-by: KAMEZAWA Hiroyuki -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org