From: Jack Steiner <steiner@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: [PATCH] - Count resched interrupts
Date: Mon, 16 Oct 2006 21:17:43 +0000 [thread overview]
Message-ID: <20061016211743.GA24855@sgi.com> (raw)
Count the number of "resched" interrupts that each cpu receives.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Index: linux/arch/ia64/kernel/irq_ia64.c
=================================--- linux.orig/arch/ia64/kernel/irq_ia64.c 2006-10-16 13:22:45.076625369 -0500
+++ linux/arch/ia64/kernel/irq_ia64.c 2006-10-16 13:56:14.262158773 -0500
@@ -180,7 +180,9 @@ ia64_handle_irq (ia64_vector vector, str
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();
reply other threads:[~2006-10-16 21:17 UTC|newest]
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