[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>

1 files changed, 18 insertions, 2 deletions

diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
index 68339dd0c9e2..9c6dafa2d0df 100644
--- 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();