Re: [PATCH RFC] nohz,blk-mq: do not create blk-mq workqueues on nohz dedicated CPUs
From: Rik van Riel
Date: Wed Apr 01 2015 - 12:12:48 EST
On 03/31/2015 11:43 AM, Jens Axboe wrote:
> That'd be easy enough to do, that's how blk-mq handles offline CPUs as
> well. The attached patch is completely untested, but will handle offline
> or nohz CPUs in the same fashion - they will punt to hardware queue 0,
> which is mapped to CPU0 (and others, depending on the queue vs CPU ratio).
I have done some sanity testing with your patch,
starting a KVM guest with vcpus and emulator threads
all pinned to nohz_full cpus.
The guest is still able to do disk IO, so things
appear to work...
Thanks for looking into this, Jens.
Tested-by: Rik van Riel <riel@xxxxxxxxxx>
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