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ARM: 5959/1: ARM: perf-events: request PMU interrupts with IRQF_NOBALANCING

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If IRQ balancing is used on a multicore ARM system, PMU interrupt
lines may be relocated onto CPUs other than the one causing the
counter overflow. This can result in misattribution of events to
the wrong core and, in the case that the CPU handling the interrupt
has not experience counter overflow, the interrupt can be disabled
because the handler returns IRQ_NONE.

This patch adds the IRQF_NOBALANCING flag to the request_irq call
in perf_events.c.

Acked-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2010-02-25 15:04:14 +01:00 committed by Russell King
parent a91ed072d6
commit ddee87f208
1 changed files with 2 additions and 1 deletions
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3
arch/arm/kernel/perf_event.c
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@ -332,7 +332,8 @@ armpmu_reserve_hardware(void)
for (i = 0; i < pmu_irqs->num_irqs; ++i) {
err = request_irq(pmu_irqs->irqs[i], armpmu->handle_irq,
IRQF_DISABLED, "armpmu", NULL);
IRQF_DISABLED | IRQF_NOBALANCING,
"armpmu", NULL);
if (err) {
pr_warning("unable to request IRQ%d for ARM "
"perf counters\n", pmu_irqs->irqs[i]);