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Date: Mon, 19 Dec 2011 11:26:05 +0100 From: Pierre Habouzit <pierre.habouzit@...ersec.com> To: Avi Kivity <avi@...hat.com> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org> Subject: Re: [PATCH] sched: allow preempt notifiers to self-unregister. On Sun, Dec 18, 2011 at 11:10:09AM +0200, Avi Kivity wrote: > On 12/16/2011 06:15 PM, Pierre Habouzit wrote: > > As a background, this need is because I have some kind of module > > code that uses this facility to evaluate how many of a group of > > threads are concurrently running (to regulate a pool of threads). > > > > That's what's cmwq is supposed to be doing (and that too should be > using preempt notifiers, IMO). It doesn't (use preempt notifiers) because it calls schedule directly and can have its own processing before and after schedule() on his own. Indeed, my goal is to have something like kernel/workqueues.c, kind of, but for *userland*. The goal is to support things like Apple pthread_workqueue_* stuff[1], and similar concepts of load-regulated userland thread pools. [1] http://people.freebsd.org/~sson/thrworkq/pthread_workqueue.3.txt -- Intersec <http://www.intersec.com> Pierre Habouzit <pierre.habouzit@...ersec.com> | Chief Software Architect Tél : +33 (0)1 5570 3346 Mob : +33 (0)6 1636 8131 Fax : +33 (0)1 5570 3332 37 Rue Pierre Lhomme 92400 Courbevoie -- 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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