Re: [PATCHSET] block: per-queue policy activation, take#2

From: Jens Axboe
Date: Fri Apr 20 2012 - 15:08:46 EST

On 2012-04-20 19:17, Tejun Heo wrote:
> Hello, Jens.
> On Fri, Apr 20, 2012 at 02:02:05PM +0200, Jens Axboe wrote:
>> Tejun, everything merged in cleanly. A boot test didn't not go so well,
>> I'm afraid. It complains about stuck RCU. Even with extra RCU
>> debugging/info turned on, it doesn't give my any extra info.
>> Config is attached. I can try and debug this on Monday, for now I've
>> pulled it out of for-next again.
> Hmmm... it works fine with the same config here (qemu w/ 4 cpus
> configured). Doesn't stuck RCU usually come from unbalanced RCU
> lock/unlocking? That should trigger context or RCU warnings before
> anything else, weird. Anyways, it would be great if you can provide
> more info on how to reproduce the problem.

The machine just sat there. I'll get some more info out of it and run a
bisect too.

Jens Axboe

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