linux-kernel - Re: [RFC] IO Controller

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Date:	Mon, 13 Apr 2009 09:09:58 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	jens.axboe@...cle.com, ryov@...inux.co.jp,
	fernando@...ellilink.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, arozansk@...hat.com, jmoyer@...hat.com,
	oz-kernel@...hat.com, dhaval@...ux.vnet.ibm.com,
	balbir@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, akpm@...ux-foundation.org,
	menage@...gle.com, peterz@...radead.org
Subject: Re: [RFC] IO Controller

On Fri, Apr 10, 2009 at 05:33:10PM +0800, Gui Jianfeng wrote:
> Vivek Goyal wrote:
> > Hi All,
> > 
> > Here is another posting for IO controller patches. Last time I had posted
> > RFC patches for an IO controller which did bio control per cgroup.
> 
>   Hi Vivek,
> 
>   I got the following OOPS when testing, can't reproduce again :(
> 

Hi Gui,

Thanks for the report. Will look into it and see if I can reproduce it.

Thanks
Vivek

> kernel BUG at block/elevator-fq.c:1396!
> invalid opcode: 0000 [#1] SMP
> last sysfs file: /sys/block/hdb/queue/scheduler
> Modules linked in: ipv6 cpufreq_ondemand acpi_cpufreq dm_mirror dm_multipath sbd
> Pid: 5032, comm: rmdir Not tainted (2.6.29-rc7-vivek #17) Veriton M460
> EIP: 0060:[<c04ec7de>] EFLAGS: 00010082 CPU: 0
> EIP is at iocg_destroy+0xdc/0x14e
> EAX: 00000000 EBX: f62278b4 ECX: f6207800 EDX: f6227904
> ESI: f6227800 EDI: f62278a0 EBP: 00000003 ESP: c8790f00
>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> Process rmdir (pid: 5032, ti=c8790000 task=f6636960 task.ti=c8790000)
> Stack:
>  f53cc5c0 f62b7258 f10991c8 00000282 f6227800 c0733fa0 ec1c5140 edfc6d34
>  c8790000 c04463ce f6a4c84c edfc6d34 0804c840 c048883c f6a4c84c f6a4c84c
>  c04888d6 f6a4c84c 00000000 c04897de f6a4c84c c048504c f115f4c0 ebc37954
> Call Trace:
>  [<c04463ce>] cgroup_diput+0x41/0x8c
>  [<c048883c>] dentry_iput+0x45/0x5e
>  [<c04888d6>] d_kill+0x19/0x32
>  [<c04897de>] dput+0xd8/0xdf
>  [<c048504c>] do_rmdir+0x8f/0xb6
>  [<c06330fc>] do_page_fault+0x2a2/0x579
>  [<c0402fc1>] sysenter_do_call+0x12/0x21
>  [<c0630000>] schedule+0x641/0x830
> Code: 08 00 74 04 0f 0b eb fe 83 7f 04 00 74 04 0f 0b eb fe 45 83 c3 1c 83 fd 0
> EIP: [<c04ec7de>] iocg_destroy+0xdc/0x14e SS:ESP 0068:c8790f00
> 
> -- 
> Regards
> Gui Jianfeng
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