powerpc: Add timer, performance monitor and machine check counts to /proc/interrupts

With NO_HZ it is useful to know how often the decrementer is going off. The
patch below adds an entry for it and also adds it into the /proc/stat
summaries.

While here, I added performance monitoring and machine check exceptions.
I found it useful to keep an eye on the PMU exception rate
when using the perf tool. Since it's possible to take a completely
handled machine check on a System p box it also sounds like a good idea to
keep a machine check summary.

The event naming matches x86 to keep gratuitous differences to a minimum.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 0a320dbd950a..895da29e7db8 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -483,6 +483,8 @@ void machine_check_exception(struct pt_regs *regs)
 {
         int recover = 0;
 
+        __get_cpu_var(irq_stat).mce_exceptions++;
+
         /* See if any machine dependent calls. In theory, we would want
          * to call the CPU first, and call the ppc_md. one if the CPU
          * one returns a positive number. However there is existing code
@@ -965,6 +967,8 @@ void vsx_unavailable_exception(struct pt_regs *regs)
 
 void performance_monitor_exception(struct pt_regs *regs)
 {
+        __get_cpu_var(irq_stat).pmu_irqs++;
+
         perf_irq(regs);
 }