Commit 65d92064 authored Aug 09, 2010 by Michael Cree Committed by Linus Torvalds Aug 09, 2010

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>

parent 7624ee72

arch/alpha/include/asm/hw_irq.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/alpha/kernel/irq.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -31,6 +31,7 @@
		#include <asm/uaccess.h>

		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;

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