linux-kernel - Re: [RFT PATCH] blkio: alloc per cpu data from worker thread context( Re: kvm deadlock)

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Date:	Fri, 16 Dec 2011 12:47:55 -0600
From:	Nate Custer <nate@...nel.net>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFT PATCH] blkio: alloc per cpu data from worker thread context( Re: kvm deadlock)


On Dec 15, 2011, at 1:47 PM, Vivek Goyal wrote:
> Ok, I continued to develop on the patch which tries to allocate per cpu
> stats from worker thread context. Here is the patch.
> 
> Can the reporter please try out the patch and see if it helps. I am not
> sure if deadlock was because of mutex issue or not, but it should help
> get rid of lockdep warning.
> 
> This patch is on top of for-3.3/core branch of jens's linux-block tree.
> If it does not apply on your kernel version, do let me know the version 
> you are testing with and I will generate another version of patch.
> 
> If testing results are good, I will break down the patch in small pieces
> and post as a series separately.
> 
> Thanks
> Vivek

Running on a fedora-16 box with the patch applied to the linux-block tree I still had deadlocks. In fact it seemed to happen much faster and with ligher workloads.

I was able to get netconsole setup and a full stacktrace is posted here:

http://pastebin.com/9Rq68exU

Nate

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