AcoSail/kernel_optimize_test
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[PATCH] invert irq/migration.c brach prediction

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If you get to that point in the code it means that desc->move_irq is set,
pending_irq_cpumask[irq] and cpu_online_map should have a value.  Still
pretty good chance anding those two you'll still have a value.  So these
two branch predictors should be inverted.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Daniel Walker 2006-06-23 02:05:29 -07:00 committed by Linus Torvalds
parent d20d04bc9b
commit 89d0cf01c0
1 changed files with 2 additions and 2 deletions
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kernel/irq/migration.c
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@ -30,7 +30,7 @@ void move_native_irq(int irq)
desc->move_irq = 0; desc->move_irq = 0;
if (likely(cpus_empty(pending_irq_cpumask[irq]))) if (unlikely(cpus_empty(pending_irq_cpumask[irq])))
return; return;
if (!desc->handler->set_affinity) if (!desc->handler->set_affinity)
@ -49,7 +49,7 @@ void move_native_irq(int irq)
* cause some ioapics to mal-function. * cause some ioapics to mal-function.
* Being paranoid i guess! * Being paranoid i guess!
*/ */
if (unlikely(!cpus_empty(tmp))) { if (likely(!cpus_empty(tmp))) {
if (likely(!(desc->status & IRQ_DISABLED))) if (likely(!(desc->status & IRQ_DISABLED)))
desc->handler->disable(irq); desc->handler->disable(irq);