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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-04-06 11:45:03 +0200
committerIngo Molnar <mingo@elte.hu>2009-04-07 10:48:56 +0200
commitb6276f353bf490add62dcf7db0ebd75baa3e1a37 (patch)
tree9720a848fca77555bef9658c56445815f6f2a29d /arch/x86/kernel/irq.c
parent671dec5daf3b3c43c5777be282f00120a44cf37f (diff)
downloadop-kernel-dev-b6276f353bf490add62dcf7db0ebd75baa3e1a37.zip
op-kernel-dev-b6276f353bf490add62dcf7db0ebd75baa3e1a37.tar.gz
perf_counter: x86: self-IPI for pending work
Implement set_perf_counter_pending() with a self-IPI so that it will run ASAP in a usable context. For now use a second IRQ vector, because the primary vector pokes the apic in funny ways that seem to confuse things. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> LKML-Reference: <20090406094517.724626696@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/irq.c')
-rw-r--r--arch/x86/kernel/irq.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 9c27543..d465487 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -67,6 +67,10 @@ static int show_other_interrupts(struct seq_file *p, int prec)
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
seq_printf(p, " Performance counter interrupts\n");
+ seq_printf(p, "PND: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", irq_stats(j)->apic_pending_irqs);
+ seq_printf(p, " Performance pending work\n");
#endif
if (generic_interrupt_extension) {
seq_printf(p, "PLT: ");
@@ -171,6 +175,7 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
sum += irq_stats(cpu)->apic_timer_irqs;
sum += irq_stats(cpu)->irq_spurious_count;
sum += irq_stats(cpu)->apic_perf_irqs;
+ sum += irq_stats(cpu)->apic_pending_irqs;
#endif
if (generic_interrupt_extension)
sum += irq_stats(cpu)->generic_irqs;
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