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

From: Tejun Heo
Date: Fri Apr 20 2012 - 13:17:46 EST

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.


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