From: Michal Hocko <mhocko@suse.cz> To: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Johannes Weiner <jweiner@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>, Balbir Singh <bsingharora@gmail.com>, Ying Han <yinghan@google.com>, Greg Thelen <gthelen@google.com>, Michel Lespinasse <walken@google.com>, Rik van Riel <riel@redhat.com>, Minchan Kim <minchan.kim@gmail.com>, Christoph Hellwig <hch@infradead.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [patch 01/11] mm: memcg: consolidate hierarchy iteration primitives Date: Mon, 19 Sep 2011 15:06:57 +0200 [thread overview] Message-ID: <20110919130656.GD21847@tiehlicka.suse.cz> (raw) In-Reply-To: <20110912223746.GA20765@shutemov.name> On Tue 13-09-11 01:37:46, Kirill A. Shutemov wrote: > On Mon, Sep 12, 2011 at 12:57:18PM +0200, Johannes Weiner wrote: [...] > > while (1) { > > - victim = mem_cgroup_select_victim(root_memcg); > > - if (victim == root_memcg) { > > + victim = mem_cgroup_iter(root_memcg, victim, true); > > + if (!victim) { > > loop++; > > /* > > * We are not draining per cpu cached charges during > > @@ -1689,10 +1644,8 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg, > > * anything, it might because there are > > * no reclaimable pages under this hierarchy > > */ > > - if (!check_soft || !total) { > > - css_put(&victim->css); > > + if (!check_soft || !total) > > break; > > - } > > /* > > * We want to do more targeted reclaim. > > * excess >> 2 is not to excessive so as to > > @@ -1700,15 +1653,13 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg, > > * coming back to reclaim from this cgroup > > */ > > if (total >= (excess >> 2) || > > - (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) { > > - css_put(&victim->css); > > + (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) > > break; > > - } > > } > > + continue; > > Souldn't we do > > victim = root_memcg; > > instead? You want to save mem_cgroup_iter call? Yes it will work... I am not sure it is really an improvement. If we just continue we can rely on mem_cgroup_iter doing the right thing. Assignment might be not that obvious. But I dunno. -- Michal Hocko SUSE Labs SUSE LINUX s.r.o. Lihovarska 1060/12 190 00 Praha 9 Czech Republic
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@suse.cz> To: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Johannes Weiner <jweiner@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>, Balbir Singh <bsingharora@gmail.com>, Ying Han <yinghan@google.com>, Greg Thelen <gthelen@google.com>, Michel Lespinasse <walken@google.com>, Rik van Riel <riel@redhat.com>, Minchan Kim <minchan.kim@gmail.com>, Christoph Hellwig <hch@infradead.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [patch 01/11] mm: memcg: consolidate hierarchy iteration primitives Date: Mon, 19 Sep 2011 15:06:57 +0200 [thread overview] Message-ID: <20110919130656.GD21847@tiehlicka.suse.cz> (raw) In-Reply-To: <20110912223746.GA20765@shutemov.name> On Tue 13-09-11 01:37:46, Kirill A. Shutemov wrote: > On Mon, Sep 12, 2011 at 12:57:18PM +0200, Johannes Weiner wrote: [...] > > while (1) { > > - victim = mem_cgroup_select_victim(root_memcg); > > - if (victim == root_memcg) { > > + victim = mem_cgroup_iter(root_memcg, victim, true); > > + if (!victim) { > > loop++; > > /* > > * We are not draining per cpu cached charges during > > @@ -1689,10 +1644,8 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg, > > * anything, it might because there are > > * no reclaimable pages under this hierarchy > > */ > > - if (!check_soft || !total) { > > - css_put(&victim->css); > > + if (!check_soft || !total) > > break; > > - } > > /* > > * We want to do more targeted reclaim. > > * excess >> 2 is not to excessive so as to > > @@ -1700,15 +1653,13 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_memcg, > > * coming back to reclaim from this cgroup > > */ > > if (total >= (excess >> 2) || > > - (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) { > > - css_put(&victim->css); > > + (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) > > break; > > - } > > } > > + continue; > > Souldn't we do > > victim = root_memcg; > > instead? You want to save mem_cgroup_iter call? Yes it will work... I am not sure it is really an improvement. If we just continue we can rely on mem_cgroup_iter doing the right thing. Assignment might be not that obvious. But I dunno. -- Michal Hocko SUSE Labs SUSE LINUX s.r.o. Lihovarska 1060/12 190 00 Praha 9 Czech Republic -- 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-09-19 13:07 UTC|newest] Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-09-12 10:57 [patch 0/11] mm: memcg naturalization -rc3 Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-12 10:57 ` [patch 01/11] mm: memcg: consolidate hierarchy iteration primitives Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-12 22:37 ` Kirill A. Shutemov 2011-09-12 22:37 ` Kirill A. Shutemov 2011-09-13 5:40 ` Johannes Weiner 2011-09-13 5:40 ` Johannes Weiner 2011-09-19 13:06 ` Michal Hocko [this message] 2011-09-19 13:06 ` Michal Hocko 2011-09-13 10:06 ` KAMEZAWA Hiroyuki 2011-09-13 10:06 ` KAMEZAWA Hiroyuki 2011-09-19 12:53 ` Michal Hocko 2011-09-19 12:53 ` Michal Hocko 2011-09-20 8:45 ` Johannes Weiner 2011-09-20 8:45 ` Johannes Weiner 2011-09-20 8:53 ` Michal Hocko 2011-09-20 8:53 ` Michal Hocko 2011-09-12 10:57 ` [patch 02/11] mm: vmscan: distinguish global reclaim from global LRU scanning Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-12 23:02 ` Kirill A. Shutemov 2011-09-12 23:02 ` Kirill A. Shutemov 2011-09-13 5:48 ` Johannes Weiner 2011-09-13 5:48 ` Johannes Weiner 2011-09-13 10:07 ` KAMEZAWA Hiroyuki 2011-09-13 10:07 ` KAMEZAWA Hiroyuki 2011-09-19 13:23 ` Michal Hocko 2011-09-19 13:23 ` Michal Hocko 2011-09-19 13:46 ` Michal Hocko 2011-09-19 13:46 ` Michal Hocko 2011-09-20 8:52 ` Johannes Weiner 2011-09-20 8:52 ` Johannes Weiner 2011-09-12 10:57 ` [patch 03/11] mm: vmscan: distinguish between memcg triggering reclaim and memcg being scanned Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:23 ` KAMEZAWA Hiroyuki 2011-09-13 10:23 ` KAMEZAWA Hiroyuki 2011-09-19 14:29 ` Michal Hocko 2011-09-19 14:29 ` Michal Hocko 2011-09-20 8:58 ` Johannes Weiner 2011-09-20 8:58 ` Johannes Weiner 2011-09-20 9:17 ` Michal Hocko 2011-09-20 9:17 ` Michal Hocko 2011-09-29 7:55 ` Johannes Weiner 2011-09-29 7:55 ` Johannes Weiner 2011-09-12 10:57 ` [patch 04/11] mm: memcg: per-priority per-zone hierarchy scan generations Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:27 ` KAMEZAWA Hiroyuki 2011-09-13 10:27 ` KAMEZAWA Hiroyuki 2011-09-13 11:03 ` Johannes Weiner 2011-09-13 11:03 ` Johannes Weiner 2011-09-14 0:55 ` KAMEZAWA Hiroyuki 2011-09-14 0:55 ` KAMEZAWA Hiroyuki 2011-09-14 5:56 ` Johannes Weiner 2011-09-14 5:56 ` Johannes Weiner 2011-09-14 7:40 ` KAMEZAWA Hiroyuki 2011-09-14 7:40 ` KAMEZAWA Hiroyuki 2011-09-20 8:15 ` Michal Hocko 2011-09-20 8:15 ` Michal Hocko 2011-09-20 8:45 ` Michal Hocko 2011-09-20 8:45 ` Michal Hocko 2011-09-20 9:10 ` Johannes Weiner 2011-09-20 9:10 ` Johannes Weiner 2011-09-20 12:37 ` Michal Hocko 2011-09-20 12:37 ` Michal Hocko 2011-09-12 10:57 ` [patch 05/11] mm: move memcg hierarchy reclaim to generic reclaim code Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:31 ` KAMEZAWA Hiroyuki 2011-09-13 10:31 ` KAMEZAWA Hiroyuki 2011-09-20 13:09 ` Michal Hocko 2011-09-20 13:09 ` Michal Hocko 2011-09-20 13:29 ` Johannes Weiner 2011-09-20 13:29 ` Johannes Weiner 2011-09-20 14:08 ` Michal Hocko 2011-09-20 14:08 ` Michal Hocko 2011-09-12 10:57 ` [patch 06/11] mm: memcg: remove optimization of keeping the root_mem_cgroup LRU lists empty Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:34 ` KAMEZAWA Hiroyuki 2011-09-13 10:34 ` KAMEZAWA Hiroyuki 2011-09-20 15:02 ` Michal Hocko 2011-09-20 15:02 ` Michal Hocko 2011-09-29 9:20 ` Johannes Weiner 2011-09-29 9:20 ` Johannes Weiner 2011-09-29 9:49 ` Michal Hocko 2011-09-29 9:49 ` Michal Hocko 2011-09-12 10:57 ` [patch 07/11] mm: vmscan: convert unevictable page rescue scanner to per-memcg LRU lists Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:37 ` KAMEZAWA Hiroyuki 2011-09-13 10:37 ` KAMEZAWA Hiroyuki 2011-09-21 12:33 ` Michal Hocko 2011-09-21 12:33 ` Michal Hocko 2011-09-21 13:47 ` Johannes Weiner 2011-09-21 13:47 ` Johannes Weiner 2011-09-21 14:08 ` Michal Hocko 2011-09-21 14:08 ` Michal Hocko 2011-09-12 10:57 ` [patch 08/11] mm: vmscan: convert global reclaim " Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:41 ` KAMEZAWA Hiroyuki 2011-09-13 10:41 ` KAMEZAWA Hiroyuki 2011-09-21 13:10 ` Michal Hocko 2011-09-21 13:10 ` Michal Hocko 2011-09-21 13:51 ` Johannes Weiner 2011-09-21 13:51 ` Johannes Weiner 2011-09-21 13:57 ` Michal Hocko 2011-09-21 13:57 ` Michal Hocko 2011-09-12 10:57 ` [patch 09/11] mm: collect LRU list heads into struct lruvec Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:43 ` KAMEZAWA Hiroyuki 2011-09-13 10:43 ` KAMEZAWA Hiroyuki 2011-09-21 13:43 ` Michal Hocko 2011-09-21 13:43 ` Michal Hocko 2011-09-21 15:15 ` Michal Hocko 2011-09-21 15:15 ` Michal Hocko 2011-09-12 10:57 ` [patch 10/11] mm: make per-memcg LRU lists exclusive Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:47 ` KAMEZAWA Hiroyuki 2011-09-13 10:47 ` KAMEZAWA Hiroyuki 2011-09-21 15:24 ` Michal Hocko 2011-09-21 15:24 ` Michal Hocko 2011-09-21 15:47 ` Johannes Weiner 2011-09-21 15:47 ` Johannes Weiner 2011-09-21 16:05 ` Michal Hocko 2011-09-21 16:05 ` Michal Hocko 2011-09-12 10:57 ` [patch 11/11] mm: memcg: remove unused node/section info from pc->flags Johannes Weiner 2011-09-12 10:57 ` Johannes Weiner 2011-09-13 10:50 ` KAMEZAWA Hiroyuki 2011-09-13 10:50 ` KAMEZAWA Hiroyuki 2011-09-21 15:32 ` Michal Hocko 2011-09-21 15:32 ` Michal Hocko 2011-09-13 20:35 ` [patch 0/11] mm: memcg naturalization -rc3 Kirill A. Shutemov 2011-09-13 20:35 ` Kirill A. Shutemov
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