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Date: Mon, 20 Dec 2010 16:24:20 +0100 From: Frederic Weisbecker <fweisbec@...il.com> To: LKML <linux-kernel@...r.kernel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Frederic Weisbecker <fweisbec@...il.com>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, "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: [RFC PATCH 13/15] sched: Protect nohz task cpu affinity 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 { -- 1.7.3.2 -- 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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