alpha: add performance monitor interrupt counter
Michael Cree [Tue, 10 Aug 2010 00:20:05 +0000 (17:20 -0700)]
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>

arch/alpha/include/asm/hw_irq.h
arch/alpha/kernel/irq.c

index a37db0f..5050ac8 100644 (file)
@@ -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
index 7f912ba..fe91298 100644 (file)
@@ -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;