[IA64] Count resched interrupts

Count the number of "resched" interrupts that each cpu receives.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
index 68339dd0c9e2045c22bbdbf028595114118b6521..9c6dafa2d0df613e95ee0d776672c85bac6d14b1 100644 (file)
--- a/arch/ia64/kernel/irq_ia64.c
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -180,7 +180,9 @@ ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
        saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
        ia64_srlz_d();
        while (vector != IA64_SPURIOUS_INT_VECTOR) {
-               if (!IS_RESCHEDULE(vector)) {
+               if (unlikely(IS_RESCHEDULE(vector)))
+                        kstat_this_cpu.irqs[vector]++;
+               else {
                        ia64_setreg(_IA64_REG_CR_TPR, vector);
                        ia64_srlz_d();
 
@@ -225,7 +227,9 @@ void ia64_process_pending_intr(void)
          * Perform normal interrupt style processing
          */
        while (vector != IA64_SPURIOUS_INT_VECTOR) {
-               if (!IS_RESCHEDULE(vector)) {
+               if (unlikely(IS_RESCHEDULE(vector)))
+                        kstat_this_cpu.irqs[vector]++;
+               else {
                        struct pt_regs *old_regs = set_irq_regs(NULL);
 
                        ia64_setreg(_IA64_REG_CR_TPR, vector);
@@ -258,11 +262,22 @@ void ia64_process_pending_intr(void)
 #ifdef CONFIG_SMP
 extern irqreturn_t handle_IPI (int irq, void *dev_id);
 
+static irqreturn_t dummy_handler (int irq, void *dev_id)
+{
+       BUG();
+}
+
 static struct irqaction ipi_irqaction = {
        .handler =      handle_IPI,
        .flags =        IRQF_DISABLED,
        .name =         "IPI"
 };
+
+static struct irqaction resched_irqaction = {
+       .handler =      dummy_handler,
+       .flags =        SA_INTERRUPT,
+       .name =         "resched"
+};
 #endif
 
 void
@@ -287,6 +302,7 @@ init_IRQ (void)
        register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
 #ifdef CONFIG_SMP
        register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
+       register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
 #endif
 #ifdef CONFIG_PERFMON
        pfm_init_percpu();