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Message-ID: <1307692251.15392.91.camel@sli10-conroe> Date: Fri, 10 Jun 2011 15:50:51 +0800 From: Shaohua Li <shaohua.li@...el.com> To: lkml <linux-kernel@...r.kernel.org> Cc: paulmck@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu> Subject: [PATCH]rcu: avoid unnecessary thread wakeup invoke_rcu_cpu_kthread could be called in the thread itself. In this case, we don't need call wakeup, which is just wasting CPU. Signed-off-by: Shaohua Li <shaohua.li@...el.com> diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 89419ff..f9bd051 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1475,7 +1475,8 @@ static void invoke_rcu_cpu_kthread(void) local_irq_restore(flags); return; } - wake_up_process(__this_cpu_read(rcu_cpu_kthread_task)); + if (current != __this_cpu_read(rcu_cpu_kthread_task)) + wake_up_process(__this_cpu_read(rcu_cpu_kthread_task)); local_irq_restore(flags); } -- 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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