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From: Gui Jianfeng <guijianfeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
To: Vivek Goyal <vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: dhaval-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org,
	snitzer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org,
	agk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	balbir-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org,
	paolo.valente-rcYM44yAMweonA0d6jMUrA@public.gmane.org,
	fernando-gVGce1chcLdL9jVzuh4AOg@public.gmane.org,
	jmoyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	fchecconi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	righi.andrea-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: [PATCH] io-controller: implement per group request allocation limitation
Date: Tue, 14 Jul 2009 15:37:59 +0800	[thread overview]
Message-ID: <4A5C35D7.1040502@cn.fujitsu.com> (raw)
In-Reply-To: <20090713160352.GA3714-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Vivek Goyal wrote:
> On Fri, Jul 10, 2009 at 09:56:21AM +0800, Gui Jianfeng wrote:
>> Hi Vivek,
>>
>> This patch exports a cgroup based per group request limits interface.
>> and removes the global one. Now we can use this interface to perform
>> different request allocation limitation for different groups. 
>>
> 
> Thanks Gui. Few points come to mind.
> 
> - You seem to be making this as per cgroup limit on all devices. I guess
>   that different devices in the system can have different settings of
>   q->nr_requests and hence will probably want different per group limit.
>   So we might have to make it per cgroup per device limit.

  Yes, per cgroup per device limitation seems more reasonable. I'll see what
  i can do.

> 
> - There does not seem to be any checks for making sure that children
>   cgroups don't have more request descriptors allocated than parent group.

  Do we really need to make it hierarchical? IMHO, maintaining this limitation
  for cgroups independently is enough.

> 
> - I am re-thinking that what's the advantage of configuring request
>   descriptors also through cgroups. It does bring in additional complexity
>   with it and it should justfiy the advantages. Can you think of some?

  I'll try, but at least, this feature lets us be able to do more accurate
  limitation. :)

> 
>   Until and unless we can come up with some significant advantages, I will
>   prefer to continue to use per group limit through q->nr_group_requests
>   interface instead of cgroup. Once things stablize, we can revisit it and
>   see how this interface can be improved.

  I agree.

-- 
Regards
Gui Jianfeng

WARNING: multiple messages have this Message-ID (diff)
From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: linux-kernel@vger.kernel.org,
	containers@lists.linux-foundation.org, dm-devel@redhat.com,
	jens.axboe@oracle.com, nauman@google.com, dpshah@google.com,
	lizf@cn.fujitsu.com, mikew@google.com, fchecconi@gmail.com,
	paolo.valente@unimore.it, ryov@valinux.co.jp,
	fernando@oss.ntt.co.jp, s-uchida@ap.jp.nec.com,
	taka@valinux.co.jp, jmoyer@redhat.com, dhaval@linux.vnet.ibm.com,
	balbir@linux.vnet.ibm.com, righi.andrea@gmail.com,
	m-ikeda@ds.jp.nec.com, jbaron@redhat.com, agk@redhat.com,
	snitzer@redhat.com, akpm@linux-foundation.org,
	peterz@infradead.org
Subject: Re: [PATCH] io-controller: implement per group request allocation limitation
Date: Tue, 14 Jul 2009 15:37:59 +0800	[thread overview]
Message-ID: <4A5C35D7.1040502@cn.fujitsu.com> (raw)
In-Reply-To: <20090713160352.GA3714@redhat.com>

Vivek Goyal wrote:
> On Fri, Jul 10, 2009 at 09:56:21AM +0800, Gui Jianfeng wrote:
>> Hi Vivek,
>>
>> This patch exports a cgroup based per group request limits interface.
>> and removes the global one. Now we can use this interface to perform
>> different request allocation limitation for different groups. 
>>
> 
> Thanks Gui. Few points come to mind.
> 
> - You seem to be making this as per cgroup limit on all devices. I guess
>   that different devices in the system can have different settings of
>   q->nr_requests and hence will probably want different per group limit.
>   So we might have to make it per cgroup per device limit.

  Yes, per cgroup per device limitation seems more reasonable. I'll see what
  i can do.

> 
> - There does not seem to be any checks for making sure that children
>   cgroups don't have more request descriptors allocated than parent group.

  Do we really need to make it hierarchical? IMHO, maintaining this limitation
  for cgroups independently is enough.

> 
> - I am re-thinking that what's the advantage of configuring request
>   descriptors also through cgroups. It does bring in additional complexity
>   with it and it should justfiy the advantages. Can you think of some?

  I'll try, but at least, this feature lets us be able to do more accurate
  limitation. :)

> 
>   Until and unless we can come up with some significant advantages, I will
>   prefer to continue to use per group limit through q->nr_group_requests
>   interface instead of cgroup. Once things stablize, we can revisit it and
>   see how this interface can be improved.

  I agree.

-- 
Regards
Gui Jianfeng


  parent reply	other threads:[~2009-07-14  7:37 UTC|newest]

Thread overview: 191+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-07-02 20:01 [RFC] IO scheduler based IO controller V6 Vivek Goyal
2009-07-02 20:01 ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 01/25] io-controller: Documentation Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 02/25] io-controller: Core of the B-WF2Q+ scheduler Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 03/25] io-controller: bfq support of in-class preemption Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 04/25] io-controller: Common flat fair queuing code in elevaotor layer Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 05/25] io-controller: Charge for time slice based on average disk rate Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 06/25] io-controller: Modify cfq to make use of flat elevator fair queuing Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 07/25] io-controller: core bfq scheduler changes for hierarchical setup Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 08/25] io-controller: cgroup related changes for hierarchical group support Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 09/25] io-controller: Common hierarchical fair queuing code in elevaotor layer Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
     [not found]   ` <1246564917-19603-10-git-send-email-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-06  2:46     ` Gui Jianfeng
2009-07-06  2:46   ` Gui Jianfeng
2009-07-06  2:46     ` Gui Jianfeng
2009-07-06 14:16     ` Vivek Goyal
2009-07-06 14:16       ` Vivek Goyal
     [not found]       ` <20090706141650.GD8279-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-07  1:40         ` [PATCH] io-controller: Get rid of css id from io cgroup Gui Jianfeng
2009-07-07  1:40           ` Gui Jianfeng
2009-07-08 14:04           ` Vivek Goyal
2009-07-08 14:04             ` Vivek Goyal
     [not found]           ` <4A52A77E.8050203-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-07-08 14:04             ` Vivek Goyal
     [not found]     ` <4A51657B.7000008-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-07-06 14:16       ` [PATCH 09/25] io-controller: Common hierarchical fair queuing code in elevaotor layer Vivek Goyal
2009-07-02 20:01 ` [PATCH 10/25] io-controller: cfq changes to use " Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 11/25] io-controller: Export disk time used and nr sectors dipatched through cgroups Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-08  2:16   ` Gui Jianfeng
2009-07-08  2:16     ` Gui Jianfeng
2009-07-08 14:00     ` Vivek Goyal
2009-07-08 14:00       ` Vivek Goyal
     [not found]     ` <4A54018C.5090804-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-07-08 14:00       ` Vivek Goyal
     [not found]   ` <1246564917-19603-12-git-send-email-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-08  2:16     ` Gui Jianfeng
2009-07-02 20:01 ` [PATCH 12/25] io-controller: idle for sometime on sync queue before expiring it Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
     [not found] ` <1246564917-19603-1-git-send-email-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-02 20:01   ` [PATCH 01/25] io-controller: Documentation Vivek Goyal
2009-07-02 20:01   ` [PATCH 02/25] io-controller: Core of the B-WF2Q+ scheduler Vivek Goyal
2009-07-02 20:01   ` [PATCH 03/25] io-controller: bfq support of in-class preemption Vivek Goyal
2009-07-02 20:01   ` [PATCH 04/25] io-controller: Common flat fair queuing code in elevaotor layer Vivek Goyal
2009-07-02 20:01   ` [PATCH 05/25] io-controller: Charge for time slice based on average disk rate Vivek Goyal
2009-07-02 20:01   ` [PATCH 06/25] io-controller: Modify cfq to make use of flat elevator fair queuing Vivek Goyal
2009-07-02 20:01   ` [PATCH 07/25] io-controller: core bfq scheduler changes for hierarchical setup Vivek Goyal
2009-07-02 20:01   ` [PATCH 08/25] io-controller: cgroup related changes for hierarchical group support Vivek Goyal
2009-07-02 20:01   ` [PATCH 09/25] io-controller: Common hierarchical fair queuing code in elevaotor layer Vivek Goyal
2009-07-02 20:01   ` [PATCH 10/25] io-controller: cfq changes to use " Vivek Goyal
2009-07-02 20:01   ` [PATCH 11/25] io-controller: Export disk time used and nr sectors dipatched through cgroups Vivek Goyal
2009-07-02 20:01   ` [PATCH 12/25] io-controller: idle for sometime on sync queue before expiring it Vivek Goyal
2009-07-02 20:01   ` [PATCH 13/25] io-controller: Wait for requests to complete from last queue before new queue is scheduled Vivek Goyal
2009-07-02 20:01   ` [PATCH 14/25] io-controller: Separate out queue and data Vivek Goyal
2009-07-02 20:01   ` [PATCH 15/25] io-conroller: Prepare elevator layer for single queue schedulers Vivek Goyal
2009-07-02 20:01   ` [PATCH 16/25] io-controller: noop changes for hierarchical fair queuing Vivek Goyal
2009-07-02 20:01   ` [PATCH 17/25] io-controller: deadline " Vivek Goyal
2009-07-02 20:01   ` [PATCH 18/25] io-controller: anticipatory " Vivek Goyal
2009-07-02 20:01   ` [PATCH 19/25] blkio_cgroup patches from Ryo to track async bios Vivek Goyal
2009-07-02 20:01   ` [PATCH 20/25] io-controller: map async requests to appropriate cgroup Vivek Goyal
2009-07-02 20:01   ` [PATCH 21/25] io-controller: Per cgroup request descriptor support Vivek Goyal
2009-07-02 20:01   ` [PATCH 22/25] io-controller: Per io group bdi congestion interface Vivek Goyal
2009-07-02 20:01   ` [PATCH 23/25] io-controller: Support per cgroup per device weights and io class Vivek Goyal
2009-07-02 20:01   ` [PATCH 24/25] io-controller: Debug hierarchical IO scheduling Vivek Goyal
2009-07-02 20:01   ` [PATCH 25/25] io-controller: experimental debug patch for async queue wait before expiry Vivek Goyal
2009-07-08  3:56   ` [RFC] IO scheduler based IO controller V6 Balbir Singh
2009-07-10  1:56   ` [PATCH] io-controller: implement per group request allocation limitation Gui Jianfeng
2009-07-27  2:10   ` [RFC] IO scheduler based IO controller V6 Gui Jianfeng
2009-07-02 20:01 ` [PATCH 13/25] io-controller: Wait for requests to complete from last queue before new queue is scheduled Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:09   ` Nauman Rafique
2009-07-02 20:09     ` Nauman Rafique
     [not found]     ` <e98e18940907021309u1f784b3at409b55ba46ed108c-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-07-02 20:17       ` Vivek Goyal
2009-07-02 20:17     ` Vivek Goyal
2009-07-02 20:17       ` Vivek Goyal
     [not found]   ` <1246564917-19603-14-git-send-email-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-02 20:09     ` Nauman Rafique
2009-07-02 20:01 ` [PATCH 14/25] io-controller: Separate out queue and data Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 15/25] io-conroller: Prepare elevator layer for single queue schedulers Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 16/25] io-controller: noop changes for hierarchical fair queuing Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 17/25] io-controller: deadline " Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 18/25] io-controller: anticipatory " Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 19/25] blkio_cgroup patches from Ryo to track async bios Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 20/25] io-controller: map async requests to appropriate cgroup Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
     [not found]   ` <1246564917-19603-21-git-send-email-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-08-03  2:13     ` Gui Jianfeng
2009-08-03  2:13   ` Gui Jianfeng
2009-08-03  2:13     ` Gui Jianfeng
     [not found]     ` <4A7647DA.5050607-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-08-04  1:25       ` Vivek Goyal
2009-08-04  1:25     ` Vivek Goyal
2009-08-04  1:25       ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 21/25] io-controller: Per cgroup request descriptor support Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-08  3:27   ` Gui Jianfeng
2009-07-08  3:27     ` Gui Jianfeng
     [not found]     ` <4A54121D.5090008-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-07-08 13:57       ` Vivek Goyal
2009-07-08 13:57     ` Vivek Goyal
2009-07-08 13:57       ` Vivek Goyal
     [not found]   ` <1246564917-19603-22-git-send-email-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-08  3:27     ` Gui Jianfeng
2009-07-21  5:37     ` Gui Jianfeng
2009-07-21  5:37   ` Gui Jianfeng
     [not found]     ` <4A655434.5060404-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-07-21  5:55       ` Nauman Rafique
2009-07-21  5:55     ` Nauman Rafique
2009-07-21  5:55       ` Nauman Rafique
2009-07-21 14:01       ` Vivek Goyal
2009-07-21 14:01         ` Vivek Goyal
     [not found]         ` <20090721140134.GB540-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-21 17:57           ` Nauman Rafique
2009-07-21 17:57         ` Nauman Rafique
2009-07-21 17:57           ` Nauman Rafique
     [not found]       ` <e98e18940907202255y5c7c546ei95d87e5a451ad0c2-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-07-21 14:01         ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 22/25] io-controller: Per io group bdi congestion interface Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-17  0:16   ` Munehiro Ikeda
2009-07-17  0:16     ` Munehiro Ikeda
2009-07-17 13:52     ` Vivek Goyal
2009-07-17 13:52       ` Vivek Goyal
     [not found]     ` <4A5FC2CA.1040609-MDRzhb/z0dd8UrSeD/g0lQ@public.gmane.org>
2009-07-17 13:52       ` Vivek Goyal
     [not found]   ` <1246564917-19603-23-git-send-email-vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-17  0:16     ` Munehiro Ikeda
2009-07-02 20:01 ` [PATCH 23/25] io-controller: Support per cgroup per device weights and io class Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 24/25] io-controller: Debug hierarchical IO scheduling Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-02 20:01 ` [PATCH 25/25] io-controller: experimental debug patch for async queue wait before expiry Vivek Goyal
2009-07-02 20:01   ` Vivek Goyal
2009-07-08  3:56 ` [RFC] IO scheduler based IO controller V6 Balbir Singh
2009-07-08  3:56   ` Balbir Singh
     [not found]   ` <20090708035621.GB3215-SINUvgVNF2CyUtPGxGje5AC/G2K4zDHf@public.gmane.org>
2009-07-08 13:41     ` Vivek Goyal
2009-07-08 13:41   ` Vivek Goyal
2009-07-08 13:41     ` Vivek Goyal
     [not found]     ` <20090708134114.GA24048-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-08 14:39       ` Balbir Singh
2009-07-08 14:39     ` Balbir Singh
2009-07-08 14:39       ` Balbir Singh
     [not found]       ` <20090708143925.GE3215-SINUvgVNF2CyUtPGxGje5AC/G2K4zDHf@public.gmane.org>
2009-07-09  1:58         ` Vivek Goyal
2009-07-09  1:58       ` Vivek Goyal
2009-07-09  1:58         ` Vivek Goyal
2009-07-10  1:56 ` [PATCH] io-controller: implement per group request allocation limitation Gui Jianfeng
2009-07-10  1:56   ` Gui Jianfeng
2009-07-13 16:03   ` Vivek Goyal
2009-07-13 16:03     ` Vivek Goyal
2009-07-13 21:08     ` Munehiro Ikeda
2009-07-13 21:08       ` Munehiro Ikeda
2009-07-14  7:45       ` Gui Jianfeng
2009-07-14  7:45         ` Gui Jianfeng
2009-08-04  2:00         ` Munehiro Ikeda
2009-08-04  2:00           ` Munehiro Ikeda
     [not found]           ` <4A77964A.7040602-MDRzhb/z0dd8UrSeD/g0lQ@public.gmane.org>
2009-08-04  6:38             ` Gui Jianfeng
2009-08-04 22:37             ` Vivek Goyal
2009-08-04  6:38           ` Gui Jianfeng
2009-08-04  6:38             ` Gui Jianfeng
2009-08-04 22:37           ` Vivek Goyal
2009-08-04 22:37             ` Vivek Goyal
     [not found]         ` <4A5C377F.4040105-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-08-04  2:00           ` Munehiro Ikeda
     [not found]       ` <4A5BA238.3030902-MDRzhb/z0dd8UrSeD/g0lQ@public.gmane.org>
2009-07-14  7:45         ` Gui Jianfeng
     [not found]     ` <20090713160352.GA3714-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-13 21:08       ` Munehiro Ikeda
2009-07-14  7:37       ` Gui Jianfeng [this message]
2009-07-14  7:37         ` Gui Jianfeng
2009-08-04  2:02   ` Munehiro Ikeda
2009-08-04  2:02     ` Munehiro Ikeda
2009-08-04  6:41     ` Gui Jianfeng
2009-08-04  6:41       ` Gui Jianfeng
     [not found]     ` <4A7796D2.4030104-MDRzhb/z0dd8UrSeD/g0lQ@public.gmane.org>
2009-08-04  6:41       ` Gui Jianfeng
2009-08-04  2:04   ` Munehiro Ikeda
2009-08-04  2:04     ` Munehiro Ikeda
     [not found]     ` <4A779719.1070900-MDRzhb/z0dd8UrSeD/g0lQ@public.gmane.org>
2009-08-04  6:45       ` Gui Jianfeng
2009-08-04  6:45     ` Gui Jianfeng
2009-08-04  6:45       ` Gui Jianfeng
     [not found]   ` <4A569FC5.7090801-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-07-13 16:03     ` Vivek Goyal
2009-08-04  2:02     ` Munehiro Ikeda
2009-08-04  2:04     ` Munehiro Ikeda
2009-07-27  2:10 ` [RFC] IO scheduler based IO controller V6 Gui Jianfeng
     [not found]   ` <4A6D0C9A.3080600-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2009-07-27 12:55     ` Vivek Goyal
2009-07-27 12:55   ` Vivek Goyal
2009-07-27 12:55     ` Vivek Goyal
2009-07-28  3:27     ` Vivek Goyal
2009-07-28  3:27       ` Vivek Goyal
     [not found]       ` <20090728032712.GC3620-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-28  3:36         ` Gui Jianfeng
2009-07-28  3:36       ` Gui Jianfeng
2009-07-28  3:36         ` Gui Jianfeng
     [not found]     ` <20090727125503.GA24449-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-07-28  3:27       ` Vivek Goyal
2009-07-28 11:36       ` Gui Jianfeng
2009-07-29  9:07       ` Gui Jianfeng
2009-07-28 11:36     ` Gui Jianfeng
2009-07-29  9:07     ` Gui Jianfeng

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