From 65d920646a1c720c5ba95b7643ab1b46167d9e6a Mon Sep 17 00:00:00 2001 From: Michael Cree Date: Mon, 9 Aug 2010 17:20:05 -0700 Subject: alpha: add performance monitor interrupt counter The following patches implement hardware performance events for the Alpha EV67 and later CPUs. I have had this running on a Compaq XP1000 (EV67, single CPU) for a few days now. Pretty cool -- discovered that the glibc exp2() library routine uses on average 985 cycles to execute 777 CPU instructions whereas Compaq's CPML library version of exp2() uses on average 32 cycles to execute 47 CPU instructions to achieve the same thing! This patch: Add performance monitor interrupt counternd and export the count to user space via /proc/interrupts. Signed-off-by: Michael Cree Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Jay Estabrook Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/alpha/kernel/irq.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'arch/alpha/kernel/irq.c') diff --git a/arch/alpha/kernel/irq.c b/arch/alpha/kernel/irq.c index 7f912ba3d9ad..fe912984d9b1 100644 --- a/arch/alpha/kernel/irq.c +++ b/arch/alpha/kernel/irq.c @@ -31,6 +31,7 @@ #include volatile unsigned long irq_err_count; +DEFINE_PER_CPU(unsigned long, irq_pmi_count); void ack_bad_irq(unsigned int irq) { @@ -63,9 +64,7 @@ int irq_select_affinity(unsigned int irq) int show_interrupts(struct seq_file *p, void *v) { -#ifdef CONFIG_SMP int j; -#endif int irq = *(loff_t *) v; struct irqaction * action; unsigned long flags; @@ -112,6 +111,10 @@ unlock: seq_printf(p, "%10lu ", cpu_data[j].ipi_count); seq_putc(p, '\n'); #endif + seq_puts(p, "PMI: "); + for_each_online_cpu(j) + seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j)); + seq_puts(p, " Performance Monitoring\n"); seq_printf(p, "ERR: %10lu\n", irq_err_count); } return 0; -- cgit v1.2.2