From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> To: Johannes Weiner <hannes@cmpxchg.org> Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "nishimura@mxp.nes.nec.co.jp" <nishimura@mxp.nes.nec.co.jp>, "balbir@linux.vnet.ibm.com" <balbir@linux.vnet.ibm.com> Subject: Re: [BUGFIX][PATCH 2/4] memcg: fix charge path for THP and allow early retirement Date: Fri, 28 Jan 2011 17:14:47 +0900 [thread overview] Message-ID: <20110128171447.1b5b19f3.kamezawa.hiroyu@jp.fujitsu.com> (raw) In-Reply-To: <20110128075724.GB2213@cmpxchg.org> On Fri, 28 Jan 2011 08:57:24 +0100 Johannes Weiner <hannes@cmpxchg.org> wrote: > On Fri, Jan 28, 2011 at 12:26:08PM +0900, KAMEZAWA Hiroyuki wrote: > > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > > > When THP is used, Hugepage size charge can happen. It's not handled > > correctly in mem_cgroup_do_charge(). For example, THP can fallback > > to small page allocation when HUGEPAGE allocation seems difficult > > or busy, but memory cgroup doesn't understand it and continue to > > try HUGEPAGE charging. And the worst thing is memory cgroup > > believes 'memory reclaim succeeded' if limit - usage > PAGE_SIZE. > > > > By this, khugepaged etc...can goes into inifinite reclaim loop > > if tasks in memcg are busy. > > > > After this patch > > - Hugepage allocation will fail if 1st trial of page reclaim fails. > > > > Changelog: > > - make changes small. removed renaming codes. > > > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > --- > > mm/memcontrol.c | 28 ++++++++++++++++++++++++---- > > 1 file changed, 24 insertions(+), 4 deletions(-) > > Was there something wrong with my oneline fix? > I thought your patch was against RHEL6. > Really, there is no way to make this a beautiful fix. The way this > function is split up makes no sense, and the constant addition of more > and more flags just to correctly communicate with _one callsite_ > should be an obvious hint. > Your version has to depend on oom_check flag to work fine. I think it's complicated. Thanks, -Kame
WARNING: multiple messages have this Message-ID (diff)
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> To: Johannes Weiner <hannes@cmpxchg.org> Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "nishimura@mxp.nes.nec.co.jp" <nishimura@mxp.nes.nec.co.jp>, "balbir@linux.vnet.ibm.com" <balbir@linux.vnet.ibm.com> Subject: Re: [BUGFIX][PATCH 2/4] memcg: fix charge path for THP and allow early retirement Date: Fri, 28 Jan 2011 17:14:47 +0900 [thread overview] Message-ID: <20110128171447.1b5b19f3.kamezawa.hiroyu@jp.fujitsu.com> (raw) In-Reply-To: <20110128075724.GB2213@cmpxchg.org> On Fri, 28 Jan 2011 08:57:24 +0100 Johannes Weiner <hannes@cmpxchg.org> wrote: > On Fri, Jan 28, 2011 at 12:26:08PM +0900, KAMEZAWA Hiroyuki wrote: > > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > > > When THP is used, Hugepage size charge can happen. It's not handled > > correctly in mem_cgroup_do_charge(). For example, THP can fallback > > to small page allocation when HUGEPAGE allocation seems difficult > > or busy, but memory cgroup doesn't understand it and continue to > > try HUGEPAGE charging. And the worst thing is memory cgroup > > believes 'memory reclaim succeeded' if limit - usage > PAGE_SIZE. > > > > By this, khugepaged etc...can goes into inifinite reclaim loop > > if tasks in memcg are busy. > > > > After this patch > > - Hugepage allocation will fail if 1st trial of page reclaim fails. > > > > Changelog: > > - make changes small. removed renaming codes. > > > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > --- > > mm/memcontrol.c | 28 ++++++++++++++++++++++++---- > > 1 file changed, 24 insertions(+), 4 deletions(-) > > Was there something wrong with my oneline fix? > I thought your patch was against RHEL6. > Really, there is no way to make this a beautiful fix. The way this > function is split up makes no sense, and the constant addition of more > and more flags just to correctly communicate with _one callsite_ > should be an obvious hint. > Your version has to depend on oom_check flag to work fine. I think it's complicated. Thanks, -Kame -- 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 policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-01-28 8:20 UTC|newest] Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-01-28 3:22 [BUGFIX][PATCH 0/4] Fixes for memcg with THP KAMEZAWA Hiroyuki 2011-01-28 3:22 ` KAMEZAWA Hiroyuki 2011-01-28 3:24 ` [BUGFIX][PATCH 1/4] memcg: fix limit estimation at reclaim for hugepage KAMEZAWA Hiroyuki 2011-01-28 3:24 ` KAMEZAWA Hiroyuki 2011-01-28 4:40 ` Daisuke Nishimura 2011-01-28 4:40 ` Daisuke Nishimura 2011-01-28 4:49 ` KAMEZAWA Hiroyuki 2011-01-28 4:49 ` KAMEZAWA Hiroyuki 2011-01-28 4:58 ` KAMEZAWA Hiroyuki 2011-01-28 4:58 ` KAMEZAWA Hiroyuki 2011-01-28 5:36 ` Daisuke Nishimura 2011-01-28 5:36 ` Daisuke Nishimura 2011-01-28 8:04 ` Minchan Kim 2011-01-28 8:04 ` Minchan Kim 2011-01-28 8:17 ` Johannes Weiner 2011-01-28 8:17 ` Johannes Weiner 2011-01-28 8:25 ` Minchan Kim 2011-01-28 8:25 ` Minchan Kim 2011-01-28 8:36 ` KAMEZAWA Hiroyuki 2011-01-28 8:36 ` KAMEZAWA Hiroyuki 2011-01-30 2:26 ` Minchan Kim 2011-01-30 2:26 ` Minchan Kim 2011-01-28 8:41 ` Johannes Weiner 2011-01-28 8:41 ` Johannes Weiner 2011-01-28 8:24 ` KAMEZAWA Hiroyuki 2011-01-28 8:24 ` KAMEZAWA Hiroyuki 2011-01-28 8:37 ` Minchan Kim 2011-01-28 8:37 ` Minchan Kim 2011-01-28 7:52 ` Johannes Weiner 2011-01-28 7:52 ` Johannes Weiner 2011-01-28 8:06 ` KAMEZAWA Hiroyuki 2011-01-28 8:06 ` KAMEZAWA Hiroyuki 2011-01-28 3:26 ` [BUGFIX][PATCH 2/4] memcg: fix charge path for THP and allow early retirement KAMEZAWA Hiroyuki 2011-01-28 3:26 ` KAMEZAWA Hiroyuki 2011-01-28 5:37 ` Daisuke Nishimura 2011-01-28 5:37 ` Daisuke Nishimura 2011-01-28 7:57 ` Johannes Weiner 2011-01-28 7:57 ` Johannes Weiner 2011-01-28 8:14 ` KAMEZAWA Hiroyuki [this message] 2011-01-28 8:14 ` KAMEZAWA Hiroyuki 2011-01-28 9:02 ` Johannes Weiner 2011-01-28 9:02 ` Johannes Weiner 2011-01-28 9:16 ` KAMEZAWA Hiroyuki 2011-01-28 9:16 ` KAMEZAWA Hiroyuki 2011-01-28 3:27 ` [BUGFIX][PATCH 3/4] mecg: fix oom flag at THP charge KAMEZAWA Hiroyuki 2011-01-28 3:27 ` KAMEZAWA Hiroyuki 2011-01-28 5:39 ` Daisuke Nishimura 2011-01-28 5:39 ` Daisuke Nishimura 2011-01-28 5:50 ` KAMEZAWA Hiroyuki 2011-01-28 5:50 ` KAMEZAWA Hiroyuki 2011-01-28 8:02 ` Johannes Weiner 2011-01-28 8:02 ` Johannes Weiner 2011-01-28 8:21 ` KAMEZAWA Hiroyuki 2011-01-28 8:21 ` KAMEZAWA Hiroyuki 2011-01-31 7:41 ` Balbir Singh 2011-01-31 7:41 ` Balbir Singh 2011-01-28 3:28 ` [BUGFIX][PATCH 4/4] memcg: fix khugepaged should skip busy memcg KAMEZAWA Hiroyuki 2011-01-28 3:28 ` KAMEZAWA Hiroyuki 2011-01-28 8:20 ` Daisuke Nishimura 2011-01-28 8:20 ` Daisuke Nishimura 2011-01-28 8:30 ` KAMEZAWA Hiroyuki 2011-01-28 8:30 ` KAMEZAWA Hiroyuki 2011-01-29 12:47 ` [BUGFIX][PATCH 0/4] Fixes for memcg with THP Balbir Singh 2011-01-29 12:47 ` Balbir Singh 2011-01-30 23:55 ` KAMEZAWA Hiroyuki 2011-01-30 23:55 ` KAMEZAWA Hiroyuki
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