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Date: Tue, 09 Oct 2007 00:18:53 -0400 From: Gregory Haskins <ghaskins@...ell.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: Mike Kravetz <kravetz@...ibm.com>, Ingo Molnar <mingo@...e.hu>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH RT] fix rt-task scheduling issue Hi Guys, Nice find! Comment inline.. (adding linux-rt-users) for reference to http://lkml.org/lkml/2007/10/8/252 On Mon, 2007-10-08 at 22:46 -0400, Steven Rostedt wrote: > Index: linux-2.6.23-rc9-rt2/kernel/sched.c > =================================================================== > --- linux-2.6.23-rc9-rt2.orig/kernel/sched.c > +++ linux-2.6.23-rc9-rt2/kernel/sched.c > @@ -2207,7 +2207,7 @@ static inline void finish_task_switch(st > * If we pushed an RT task off the runqueue, > * then kick other CPUs, they might run it: > */ > - if (unlikely(rt_task(current) && prev->se.on_rq && rt_task(prev))) { > + if (unlikely(rt_task(current) && rq->rt_nr_running > 1)) { > schedstat_inc(rq, rto_schedule); > smp_send_reschedule_allbutself_cpumask(current->cpus_allowed); the current->cpus_allowed I think probably should have been "prev->cpus_allowed" in the original code? However, in light of the new findings with this bug Mike found, this should probably be sent to allbutself() without the mask since you don't know what could have been queued behind you. Unless I am missing something? Regards, -Greg - 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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