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authorJoe Korty <joe.korty@ccur.com>2007-10-17 12:04:40 -0400
committerThomas Gleixner <tglx@inhelltoy.tec.linutronix.de>2007-10-17 14:16:53 -0400
commit38e760a1335ffaca5a08624a9aed6fe2055c2c98 (patch)
treec313888b750a56db7c9c09c8af5be830bb75b81e /arch/x86/kernel/smp_32.c
parent9aa8d7195acb18fc436847f6c66a97f8359ad54d (diff)
x86: expand /proc/interrupts to include missing vectors, v2
Add missing IRQs and IRQ descriptions to /proc/interrupts. /proc/interrupts is most useful when it displays every IRQ vector in use by the system, not just those somebody thought would be interesting. This patch inserts the following vector displays to the i386 and x86_64 platforms, as appropriate: rescheduling interrupts TLB flush interrupts function call interrupts thermal event interrupts threshold interrupts spurious interrupts A threshold interrupt occurs when ECC memory correction is occuring at too high a frequency. Thresholds are used by the ECC hardware as occasional ECC failures are part of normal operation, but long sequences of ECC failures usually indicate a memory chip that is about to fail. Thermal event interrupts occur when a temperature threshold has been exceeded for some CPU chip. IIRC, a thermal interrupt is also generated when the temperature drops back to a normal level. A spurious interrupt is an interrupt that was raised then lowered by the device before it could be fully processed by the APIC. Hence the apic sees the interrupt but does not know what device it came from. For this case the APIC hardware will assume a vector of 0xff. Rescheduling, call, and TLB flush interrupts are sent from one CPU to another per the needs of the OS. Typically, their statistics would be used to discover if an interrupt flood of the given type has been occuring. AK: merged v2 and v4 which had some more tweaks AK: replace Local interrupts with Local timer interrupts AK: Fixed description of interrupt types. [ tglx: arch/x86 adaptation ] [ mingo: small cleanup ] Signed-off-by: Joe Korty <joe.korty@ccur.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Tim Hockin <thockin@hockin.org> Cc: Andi Kleen <ak@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/smp_32.c')
-rw-r--r--arch/x86/kernel/smp_32.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/smp_32.c b/arch/x86/kernel/smp_32.c
index eebc6e82576c..791d9f8036ae 100644
--- a/arch/x86/kernel/smp_32.c
+++ b/arch/x86/kernel/smp_32.c
@@ -342,6 +342,7 @@ fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
342 smp_mb__after_clear_bit(); 342 smp_mb__after_clear_bit();
343out: 343out:
344 put_cpu_no_resched(); 344 put_cpu_no_resched();
345 __get_cpu_var(irq_stat).irq_tlb_count++;
345} 346}
346 347
347void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm, 348void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
@@ -640,6 +641,7 @@ static void native_smp_send_stop(void)
640fastcall void smp_reschedule_interrupt(struct pt_regs *regs) 641fastcall void smp_reschedule_interrupt(struct pt_regs *regs)
641{ 642{
642 ack_APIC_irq(); 643 ack_APIC_irq();
644 __get_cpu_var(irq_stat).irq_resched_count++;
643} 645}
644 646
645fastcall void smp_call_function_interrupt(struct pt_regs *regs) 647fastcall void smp_call_function_interrupt(struct pt_regs *regs)
@@ -660,6 +662,7 @@ fastcall void smp_call_function_interrupt(struct pt_regs *regs)
660 */ 662 */
661 irq_enter(); 663 irq_enter();
662 (*func)(info); 664 (*func)(info);
665 __get_cpu_var(irq_stat).irq_call_count++;
663 irq_exit(); 666 irq_exit();
664 667
665 if (wait) { 668 if (wait) {