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Re: [PATCH 2/2] xfs: mark the xfs-alloc workqueue as high priority

To: Tejun Heo <tj@xxxxxxxxxx>
Subject: Re: [PATCH 2/2] xfs: mark the xfs-alloc workqueue as high priority
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Mon, 12 Jan 2015 17:12:34 -0600
Cc: Eric Sandeen <sandeen@xxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20150112225314.GC22156@xxxxxxxxxxxxxx>
References: <54B01927.2010506@xxxxxxxxxx> <54B019F4.8030009@xxxxxxxxxxx> <20150109182310.GA2785@xxxxxxxxxxxxxx> <54B03BCC.7040207@xxxxxxxxxxx> <20150110192852.GD25319@xxxxxxxxxxxxxx> <54B429EB.9050807@xxxxxxxxxxx> <20150112225314.GC22156@xxxxxxxxxxxxxx>
On 1/12/15 4:53 PM, Tejun Heo wrote:
> Hello, Eric.

Hi Tejun :)

> This doesn't look like the direct cause.  It could just be reclaim
> path going berserk as the filesystem can't writeout pages.  Can you
> dump all runnable tasks?  Was this the only runnable kworker?
> 
> Thanks.

The only tasks in RU state are the one I mentioned, and swapper/X.

crash> ps -m | grep RU
[0 00:00:00.159] [RU]  PID: 17056  TASK: c000000111cc0000  CPU: 8   COMMAND: 
"kworker/u112:1"
[4 19:11:44.360] [RU]  PID: 0      TASK: c0000000010416f0  CPU: 0   COMMAND: 
"swapper/0"
[4 19:11:44.192] [RU]  PID: 0      TASK: c000000633280000  CPU: 1   COMMAND: 
"swapper/1"
[4 19:11:44.192] [RU]  PID: 0      TASK: c0000006332c0000  CPU: 2   COMMAND: 
"swapper/2"
...

and I don't see anything interesting in those. :)

-Eric


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