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Message-ID: <x49zk1rvxm2.fsf@segfault.boston.devel.redhat.com> Date: Thu, 06 Dec 2012 13:33:57 -0500 From: Jeff Moyer <jmoyer@...hat.com> To: Tejun Heo <tj@...nel.org> Cc: Jens Axboe <jaxboe@...ionio.com>, "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm\@kvack.org" <linux-mm@...ck.org>, Zach Brown <zab@...hat.com>, Peter Zijlstra <pzijlstr@...hat.com>, Ingo <mingo@...hat.com> Subject: Re: [patch,v2] bdi: add a user-tunable cpu_list for the bdi flusher threads Tejun Heo <tj@...nel.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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