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authorMichael Cree <mcree@orcon.net.nz>2010-08-09 17:20:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:45:03 -0700
commit65d920646a1c720c5ba95b7643ab1b46167d9e6a (patch)
tree262f77223f5368bdfdb461e658d8ddd6750f651f /arch/alpha/include/asm
parent7624ee72aa09334af072853457a5d46d9901c3f8 (diff)
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 <mcree@orcon.net.nz> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jay Estabrook <jay.estabrook@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha/include/asm')
-rw-r--r--arch/alpha/include/asm/hw_irq.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/hw_irq.h b/arch/alpha/include/asm/hw_irq.h
index a37db0f9509..5050ac81cd9 100644
--- a/arch/alpha/include/asm/hw_irq.h
+++ b/arch/alpha/include/asm/hw_irq.h
@@ -3,6 +3,7 @@
extern volatile unsigned long irq_err_count;
+DECLARE_PER_CPU(unsigned long, irq_pmi_count);
#ifdef CONFIG_ALPHA_GENERIC
#define ACTUAL_NR_IRQS alpha_mv.nr_irqs