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SubjectRe: [patch,v2] bdi: add a user-tunable cpu_list for the bdi flusher threads
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Tejun Heo <tj@kernel.org> writes:

> Hello, Jens.
>
> On Thu, Dec 06, 2012 at 07:19:34PM +0100, Jens Axboe wrote:
>> We need to expose it. Once the binding is set from the kernel side on a
>> kernel thread, it can't be modified.
>
> That's only if kthread_bind() is used. Caling set_cpus_allowed_ptr()
> doesn't set PF_THREAD_BOUND and userland can adjust affinity like any
> other tasks.
>
>> Binding either for performance reasons or for ensuring that we
>> explicitly don't run in some places is a very useful feature.
>
> Sure, but I think this is too specific. Something more generic would
> be much better. It can be as simple as generating a uevent.

I'm in favor of a more general approach. For now, I'm still going to
push a patch that at least binds to the proper numa node. I'll post
that after I've tested it.

Cheers,
Jeff


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