From: Tejun Heo <tj@kernel.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
Jens Axboe <axboe@kernel.dk>,
linux-mm@kvack.org, sjayaraman@suse.com, andrea@betterlinux.com,
jmoyer@redhat.com, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, kamezawa.hiroyu@jp.fujitsu.com,
lizefan@huawei.com, containers@lists.linux-foundation.org,
cgroups@vger.kernel.org, ctalbott@google.com, rni@google.com,
lsf@lists.linux-foundation.org
Subject: Re: [RFC] writeback and cgroup
Date: Fri, 20 Apr 2012 14:33:01 -0700 [thread overview]
Message-ID: <20120420213301.GA29134@google.com> (raw)
In-Reply-To: <20120420192930.GR22419@redhat.com>
On Fri, Apr 20, 2012 at 03:29:30PM -0400, Vivek Goyal wrote:
> I am personally is not too excited about the case of putting async IO
> in separate groups due to the reason that async IO of one group will
> start impacting latencies of sync IO of another group and in practice
> it might not be desirable. But there are others who have use cases for
> separate async IO queue. So as long as switch is there to change the
> behavior, I am not too worried.
Why not just fix cfq so that it prefers groups w/ sync IOs?
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
Jens Axboe <axboe@kernel.dk>,
linux-mm@kvack.org, sjayaraman@suse.com, andrea@betterlinux.com,
jmoyer@redhat.com, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, kamezawa.hiroyu@jp.fujitsu.com,
lizefan@huawei.com, containers@lists.linux-foundation.org,
cgroups@vger.kernel.org, ctalbott@google.com, rni@google.com,
lsf@lists.linux-foundation.org
Subject: Re: [RFC] writeback and cgroup
Date: Fri, 20 Apr 2012 14:33:01 -0700 [thread overview]
Message-ID: <20120420213301.GA29134@google.com> (raw)
In-Reply-To: <20120420192930.GR22419@redhat.com>
On Fri, Apr 20, 2012 at 03:29:30PM -0400, Vivek Goyal wrote:
> I am personally is not too excited about the case of putting async IO
> in separate groups due to the reason that async IO of one group will
> start impacting latencies of sync IO of another group and in practice
> it might not be desirable. But there are others who have use cases for
> separate async IO queue. So as long as switch is there to change the
> behavior, I am not too worried.
Why not just fix cfq so that it prefers groups w/ sync IOs?
--
tejun
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next prev parent reply other threads:[~2012-04-20 21:33 UTC|newest]
Thread overview: 262+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-03 18:36 [RFC] writeback and cgroup Tejun Heo
2012-04-03 18:36 ` Tejun Heo
2012-04-03 18:36 ` Tejun Heo
2012-04-04 14:51 ` Vivek Goyal
2012-04-04 14:51 ` Vivek Goyal
2012-04-04 15:36 ` [Lsf] " Steve French
2012-04-04 15:36 ` Steve French
2012-04-04 15:36 ` Steve French
2012-04-04 18:56 ` Tejun Heo
2012-04-04 18:56 ` Tejun Heo
2012-04-04 19:19 ` Vivek Goyal
2012-04-04 19:19 ` Vivek Goyal
2012-04-25 8:47 ` Suresh Jayaraman
2012-04-25 8:47 ` Suresh Jayaraman
2012-04-25 8:47 ` Suresh Jayaraman
[not found] ` <20120404191918.GK12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-25 8:47 ` Suresh Jayaraman
[not found] ` <20120404185605.GC29686-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-04-04 19:19 ` Vivek Goyal
[not found] ` <CAH2r5mtwQa0Uu=_Yd2JywVJXA=OMGV43X_OUfziC-yeVy9BGtQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-04 18:56 ` Tejun Heo
2012-04-04 18:49 ` Tejun Heo
2012-04-04 18:49 ` Tejun Heo
2012-04-04 18:49 ` Tejun Heo
2012-04-04 19:23 ` [Lsf] " Steve French
2012-04-04 19:23 ` Steve French
[not found] ` <CAH2r5mvP56D0y4mk5wKrJcj+=OZ0e0Q5No_L+9a8a=GMcEhRew-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-14 12:15 ` Peter Zijlstra
2012-04-14 12:15 ` Peter Zijlstra
2012-04-14 12:15 ` Peter Zijlstra
2012-04-14 12:15 ` Peter Zijlstra
[not found] ` <20120404184909.GB29686-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-04-04 19:23 ` Steve French
2012-04-04 20:32 ` Vivek Goyal
2012-04-05 16:38 ` Tejun Heo
2012-04-14 11:53 ` [Lsf] " Peter Zijlstra
2012-04-04 20:32 ` Vivek Goyal
2012-04-04 20:32 ` Vivek Goyal
[not found] ` <20120404203239.GM12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-04 23:02 ` Tejun Heo
2012-04-04 23:02 ` Tejun Heo
2012-04-04 23:02 ` Tejun Heo
2012-04-04 23:02 ` Tejun Heo
2012-04-05 16:38 ` Tejun Heo
2012-04-05 16:38 ` Tejun Heo
2012-04-05 16:38 ` Tejun Heo
[not found] ` <20120405163854.GE12854-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-05 17:13 ` Vivek Goyal
2012-04-05 17:13 ` Vivek Goyal
2012-04-05 17:13 ` Vivek Goyal
2012-04-14 11:53 ` [Lsf] " Peter Zijlstra
2012-04-14 11:53 ` Peter Zijlstra
2012-04-14 11:53 ` Peter Zijlstra
2012-04-16 1:25 ` Steve French
[not found] ` <20120404145134.GC12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-04 15:36 ` Steve French
2012-04-04 18:49 ` Tejun Heo
2012-04-07 8:00 ` Jan Kara
2012-04-07 8:00 ` Jan Kara
2012-04-07 8:00 ` Jan Kara
[not found] ` <20120407080027.GA2584-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-10 16:23 ` [Lsf] " Steve French
2012-04-10 18:06 ` Vivek Goyal
2012-04-10 16:23 ` [Lsf] " Steve French
2012-04-10 16:23 ` Steve French
2012-04-10 16:23 ` Steve French
[not found] ` <CAH2r5mvLVnM3Se5vBBsYzwaz5Ckp3i6SVnGp2T0XaGe9_u8YYA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-10 18:16 ` Vivek Goyal
2012-04-10 18:16 ` Vivek Goyal
2012-04-10 18:16 ` Vivek Goyal
2012-04-10 18:06 ` Vivek Goyal
2012-04-10 18:06 ` Vivek Goyal
[not found] ` <20120410180653.GJ21801-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-10 21:05 ` Jan Kara
2012-04-10 21:05 ` Jan Kara
2012-04-10 21:05 ` Jan Kara
[not found] ` <20120410210505.GE4936-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-10 21:20 ` Vivek Goyal
2012-04-10 21:20 ` Vivek Goyal
2012-04-10 21:20 ` Vivek Goyal
[not found] ` <20120410212041.GP21801-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-10 22:24 ` Jan Kara
2012-04-10 22:24 ` Jan Kara
2012-04-10 22:24 ` Jan Kara
[not found] ` <20120410222425.GF4936-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-11 15:40 ` Vivek Goyal
2012-04-11 15:40 ` Vivek Goyal
2012-04-11 15:40 ` Vivek Goyal
2012-04-11 15:45 ` Vivek Goyal
2012-04-11 15:45 ` Vivek Goyal
[not found] ` <20120411154531.GE16692-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-11 17:05 ` Jan Kara
2012-04-11 17:05 ` Jan Kara
2012-04-11 17:05 ` Jan Kara
2012-04-11 17:23 ` Vivek Goyal
2012-04-11 17:23 ` Vivek Goyal
[not found] ` <20120411172311.GF16692-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-11 19:44 ` Jan Kara
2012-04-11 19:44 ` Jan Kara
2012-04-11 19:44 ` Jan Kara
[not found] ` <20120411170542.GB16008-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-11 17:23 ` Vivek Goyal
2012-04-17 21:48 ` Tejun Heo
2012-04-17 21:48 ` Tejun Heo
2012-04-17 21:48 ` Tejun Heo
2012-04-17 21:48 ` Tejun Heo
2012-04-18 18:18 ` Vivek Goyal
2012-04-18 18:18 ` Vivek Goyal
[not found] ` <20120417214831.GE19975-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-18 18:18 ` Vivek Goyal
[not found] ` <20120411154005.GD16692-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-11 15:45 ` Vivek Goyal
2012-04-11 19:22 ` Jan Kara
2012-04-14 12:25 ` [Lsf] " Peter Zijlstra
2012-04-11 19:22 ` Jan Kara
2012-04-11 19:22 ` Jan Kara
[not found] ` <20120411192231.GF16008-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-12 20:37 ` Vivek Goyal
2012-04-12 20:37 ` Vivek Goyal
2012-04-12 20:37 ` Vivek Goyal
2012-04-12 20:51 ` Tejun Heo
2012-04-12 20:51 ` Tejun Heo
[not found] ` <20120412205148.GA24056-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-14 14:36 ` Fengguang Wu
2012-04-14 14:36 ` Fengguang Wu
2012-04-16 14:57 ` Vivek Goyal
2012-04-16 14:57 ` Vivek Goyal
2012-04-24 11:33 ` Fengguang Wu
2012-04-24 11:33 ` Fengguang Wu
2012-04-24 14:56 ` Jan Kara
2012-04-24 14:56 ` Jan Kara
2012-04-24 14:56 ` Jan Kara
2012-04-24 14:56 ` Jan Kara
2012-04-24 15:58 ` Vivek Goyal
2012-04-24 15:58 ` Vivek Goyal
[not found] ` <20120424155843.GG26708-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-25 2:42 ` Fengguang Wu
2012-04-25 2:42 ` Fengguang Wu
2012-04-25 2:42 ` Fengguang Wu
2012-04-25 2:42 ` Fengguang Wu
[not found] ` <20120424145655.GA1474-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-24 15:58 ` Vivek Goyal
2012-04-25 3:16 ` Fengguang Wu
2012-04-25 3:16 ` Fengguang Wu
2012-04-25 9:01 ` Jan Kara
2012-04-25 9:01 ` Jan Kara
2012-04-25 9:01 ` Jan Kara
[not found] ` <20120425090156.GB12568-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-25 12:05 ` Fengguang Wu
2012-04-25 12:05 ` Fengguang Wu
2012-04-25 9:01 ` Jan Kara
[not found] ` <20120416145744.GA15437-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-24 11:33 ` Fengguang Wu
2012-04-16 14:57 ` Vivek Goyal
2012-04-15 11:37 ` [Lsf] " Peter Zijlstra
2012-04-15 11:37 ` Peter Zijlstra
2012-04-15 11:37 ` Peter Zijlstra
[not found] ` <20120412203719.GL2207-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-12 20:51 ` Tejun Heo
2012-04-15 11:37 ` [Lsf] " Peter Zijlstra
2012-04-17 22:01 ` Tejun Heo
2012-04-17 22:01 ` Tejun Heo
2012-04-17 22:01 ` Tejun Heo
2012-04-17 22:01 ` Tejun Heo
2012-04-18 6:30 ` Jan Kara
2012-04-18 6:30 ` Jan Kara
[not found] ` <20120417220106.GF19975-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-18 6:30 ` Jan Kara
2012-04-14 12:25 ` [Lsf] " Peter Zijlstra
2012-04-14 12:25 ` Peter Zijlstra
2012-04-14 12:25 ` Peter Zijlstra
2012-04-16 12:54 ` Vivek Goyal
2012-04-16 12:54 ` Vivek Goyal
2012-04-16 12:54 ` Vivek Goyal
2012-04-16 13:07 ` Fengguang Wu
2012-04-16 13:07 ` Fengguang Wu
2012-04-16 14:19 ` Fengguang Wu
2012-04-16 14:19 ` Fengguang Wu
2012-04-16 14:19 ` Fengguang Wu
2012-04-16 15:52 ` Vivek Goyal
2012-04-16 15:52 ` Vivek Goyal
2012-04-16 15:52 ` Vivek Goyal
[not found] ` <20120416155207.GB15437-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-17 2:14 ` Fengguang Wu
2012-04-17 2:14 ` Fengguang Wu
2012-04-17 2:14 ` Fengguang Wu
[not found] ` <20120416125432.GB12776-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-16 13:07 ` Fengguang Wu
[not found] ` <20120403183655.GA23106-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-04-04 14:51 ` Vivek Goyal
2012-04-04 17:51 ` Fengguang Wu
2012-04-04 17:51 ` Fengguang Wu
2012-04-04 17:51 ` Fengguang Wu
2012-04-04 18:35 ` Vivek Goyal
2012-04-04 18:35 ` Vivek Goyal
[not found] ` <20120404183528.GJ12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-04 21:42 ` Fengguang Wu
2012-04-04 21:42 ` Fengguang Wu
2012-04-04 21:42 ` Fengguang Wu
2012-04-05 15:10 ` Vivek Goyal
2012-04-05 15:10 ` Vivek Goyal
[not found] ` <20120405151026.GB23999-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-06 0:32 ` Fengguang Wu
2012-04-06 0:32 ` Fengguang Wu
2012-04-06 0:32 ` Fengguang Wu
2012-04-05 15:10 ` Vivek Goyal
2012-04-04 18:35 ` Vivek Goyal
2012-04-04 19:33 ` Tejun Heo
2012-04-04 19:33 ` Tejun Heo
2012-04-04 19:33 ` Tejun Heo
2012-04-06 9:59 ` Fengguang Wu
2012-04-06 9:59 ` Fengguang Wu
2012-04-06 9:59 ` Fengguang Wu
2012-04-17 22:38 ` Tejun Heo
2012-04-17 22:38 ` Tejun Heo
2012-04-17 22:38 ` Tejun Heo
2012-04-17 22:38 ` Tejun Heo
2012-04-19 14:23 ` Fengguang Wu
2012-04-19 14:23 ` Fengguang Wu
2012-04-19 14:23 ` Fengguang Wu
2012-04-19 18:31 ` Vivek Goyal
2012-04-19 18:31 ` Vivek Goyal
[not found] ` <20120419183118.GM10216-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-20 12:45 ` Fengguang Wu
2012-04-20 12:45 ` Fengguang Wu
2012-04-20 12:45 ` Fengguang Wu
2012-04-20 19:29 ` Vivek Goyal
2012-04-20 19:29 ` Vivek Goyal
2012-04-20 21:33 ` Tejun Heo [this message]
2012-04-20 21:33 ` Tejun Heo
2012-04-22 14:26 ` Fengguang Wu
2012-04-22 14:26 ` Fengguang Wu
[not found] ` <20120420213301.GA29134-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-22 14:26 ` Fengguang Wu
2012-04-23 12:30 ` Vivek Goyal
2012-04-23 12:30 ` Vivek Goyal
2012-04-23 12:30 ` Vivek Goyal
2012-04-23 16:04 ` Tejun Heo
2012-04-23 16:04 ` Tejun Heo
[not found] ` <20120423123011.GA8103-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-23 16:04 ` Tejun Heo
[not found] ` <20120420192930.GR22419-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-20 21:33 ` Tejun Heo
2012-04-20 19:29 ` Vivek Goyal
2012-04-19 18:31 ` Vivek Goyal
2012-04-19 20:26 ` Jan Kara
2012-04-19 20:26 ` Jan Kara
2012-04-19 20:26 ` Jan Kara
2012-04-20 13:34 ` Fengguang Wu
2012-04-20 13:34 ` Fengguang Wu
2012-04-20 19:08 ` Tejun Heo
2012-04-20 19:08 ` Tejun Heo
2012-04-20 19:08 ` Tejun Heo
[not found] ` <20120420190844.GH32324-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-22 14:46 ` Fengguang Wu
2012-04-22 14:46 ` Fengguang Wu
2012-04-22 14:46 ` Fengguang Wu
2012-04-22 14:46 ` Fengguang Wu
2012-04-23 16:56 ` Tejun Heo
2012-04-23 16:56 ` Tejun Heo
2012-04-23 16:56 ` Tejun Heo
[not found] ` <20120423165626.GB5406-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-24 7:58 ` Fengguang Wu
2012-04-24 7:58 ` Fengguang Wu
2012-04-24 7:58 ` Fengguang Wu
2012-04-25 15:47 ` Tejun Heo
2012-04-25 15:47 ` Tejun Heo
2012-04-25 15:47 ` Tejun Heo
2012-04-23 9:14 ` Jan Kara
2012-04-23 9:14 ` Jan Kara
2012-04-23 9:14 ` Jan Kara
2012-04-23 10:24 ` Fengguang Wu
2012-04-23 10:24 ` Fengguang Wu
2012-04-23 12:42 ` Jan Kara
2012-04-23 12:42 ` Jan Kara
2012-04-23 14:31 ` Fengguang Wu
2012-04-23 14:31 ` Fengguang Wu
[not found] ` <20120423124240.GE6512-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-23 14:31 ` Fengguang Wu
2012-04-23 12:42 ` Jan Kara
[not found] ` <20120423091432.GC6512-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-23 10:24 ` Fengguang Wu
[not found] ` <20120419202635.GA4795-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-20 13:34 ` Fengguang Wu
[not found] ` <20120417223854.GG19975-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-19 14:23 ` Fengguang Wu
2012-04-18 6:57 ` Jan Kara
2012-04-18 6:57 ` Jan Kara
2012-04-18 7:58 ` Fengguang Wu
2012-04-18 7:58 ` Fengguang Wu
2012-04-18 7:58 ` Fengguang Wu
[not found] ` <20120418065720.GA21485-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-18 7:58 ` Fengguang Wu
2012-04-18 6:57 ` Jan Kara
[not found] ` <20120404193355.GD29686-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-04-04 20:18 ` Vivek Goyal
2012-04-04 20:18 ` Vivek Goyal
2012-04-04 20:18 ` Vivek Goyal
2012-04-05 16:31 ` Tejun Heo
2012-04-05 16:31 ` Tejun Heo
2012-04-05 17:09 ` Vivek Goyal
2012-04-05 17:09 ` Vivek Goyal
[not found] ` <20120405163113.GD12854-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-05 17:09 ` Vivek Goyal
[not found] ` <20120404201816.GL12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-05 16:31 ` Tejun Heo
2012-04-06 9:59 ` Fengguang Wu
2012-04-03 18:36 Tejun Heo
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