[PATCH -rt 4/9] ifdef raise_softirq_irqoff wakeup

raise_softirq is called every timer interrupt in run_local_timers(),
which causes a thread wakeup to happen every timer interrupt. This
happens in !CONFIG_PREEMPT_SOFTIRQS, which means the wakeup is most
likely not needed. In addition it also fouls calc_load() since it's,
agian, observing at least one thread running on every invocation.

Signed-off-by: Daniel Walker <[email protected]>
 
---
 kernel/softirq.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6.22/kernel/softirq.c
===================================================================
--- linux-2.6.22.orig/kernel/softirq.c
+++ linux-2.6.22/kernel/softirq.c
@@ -508,7 +508,9 @@ inline fastcall void raise_softirq_irqof
 {
 	__do_raise_softirq_irqoff(nr);
 
+#ifdef CONFIG_PREEMPT_SOFTIRQS
 	wakeup_softirqd(nr);
+#endif
 }
 
 EXPORT_SYMBOL(raise_softirq_irqoff);

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---

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    • From: Daniel Walker <[email protected]>

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