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Date: Mon, 20 Dec 2010 17:28:53 +0100 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Frederic Weisbecker <fweisbec@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>, Lai Jiangshan <laijs@...fujitsu.com>, Andrew Morton <akpm@...ux-foundation.org>, Anton Blanchard <anton@....ibm.com>, Tim Pepper <lnxninja@...ux.vnet.ibm.com> Subject: Re: [RFC PATCH 13/15] sched: Protect nohz task cpu affinity On Mon, 2010-12-20 at 16:24 +0100, Frederic Weisbecker wrote: > Don't allow to change a nohz task cpu affinity as we want them > to be bound to a single CPU and we want this affinity not to > change. > > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> > Cc: Thomas Gleixner <tglx@...utronix.de> > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl> > Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> > Cc: Ingo Molnar <mingo@...e.hu> > Cc: Steven Rostedt <rostedt@...dmis.org> > Cc: Lai Jiangshan <laijs@...fujitsu.com> > Cc: Andrew Morton <akpm@...ux-foundation.org> > Cc: Anton Blanchard <anton@....ibm.com> > Cc: Tim Pepper <lnxninja@...ux.vnet.ibm.com> > --- > kernel/sched.c | 7 +++++++ > 1 files changed, 7 insertions(+), 0 deletions(-) > > diff --git a/kernel/sched.c b/kernel/sched.c > index 4412493..bd0a41f 100644 > --- a/kernel/sched.c > +++ b/kernel/sched.c > @@ -5712,6 +5712,13 @@ again: > goto out; > } > > + /* Nohz tasks must keep their affinity */ > + if (test_tsk_thread_flag(p, TIF_NOHZ) && > + !cpumask_equal(&p->cpus_allowed, new_mask)) { > + ret = -EBUSY; > + goto out; > + } > + > if (p->sched_class->set_cpus_allowed) > p->sched_class->set_cpus_allowed(p, new_mask); > else { NAK, this is really way too restrictive. -- 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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