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Subject[PATCH] 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.

Signed-off-by: Joe Korty <joe.korty@ccur.com>

Index: 2.6.23-rc1-git7/arch/i386/kernel/apic.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/i386/kernel/apic.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/i386/kernel/apic.c 2007-07-30 19:08:07.000000000 -0400
@@ -1280,6 +1280,7 @@
printk(KERN_INFO "spurious APIC interrupt on CPU#%d, "
"should never happen.\n", smp_processor_id());
irq_exit();
+ __get_cpu_var(irq_stat).irq_spur_counts++;
}

/*
Index: 2.6.23-rc1-git7/arch/i386/kernel/cpu/mcheck/p4.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/i386/kernel/cpu/mcheck/p4.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/i386/kernel/cpu/mcheck/p4.c 2007-07-30 19:08:07.000000000 -0400
@@ -62,6 +62,7 @@
irq_enter();
vendor_thermal_interrupt(regs);
irq_exit();
+ __get_cpu_var(irq_stat).irq_thermal_counts++;
}

/* P4/Xeon Thermal regulation detect and init */
Index: 2.6.23-rc1-git7/arch/i386/kernel/irq.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/i386/kernel/irq.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/i386/kernel/irq.c 2007-07-30 19:08:07.000000000 -0400
@@ -284,14 +284,45 @@
seq_printf(p, "NMI: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", nmi_count(j));
- seq_putc(p, '\n');
+ seq_printf(p, " Non-maskable interrupts\n");
#ifdef CONFIG_X86_LOCAL_APIC
seq_printf(p, "LOC: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ",
per_cpu(irq_stat,j).apic_timer_irqs);
- seq_putc(p, '\n');
+ seq_printf(p, " Local interrupts\n");
#endif
+#ifdef CONFIG_SMP
+ seq_printf(p, "RES: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_resched_counts);
+ seq_printf(p, " Rescheduling interrupts\n");
+#endif
+#ifdef CONFIG_SMP
+ seq_printf(p, "CAL: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_call_counts);
+ seq_printf(p, " function call interrupts\n");
+#endif
+#ifdef CONFIG_SMP
+ seq_printf(p, "TLB: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_tlb_counts);
+ seq_printf(p, " TLB shootdowns\n");
+#endif
+ seq_printf(p, "TRM: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_thermal_counts);
+ seq_printf(p, " Thermal event interrupts\n");
+ seq_printf(p, "SPU: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_spur_counts);
+ seq_printf(p, " Spurious interrupts\n");
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
Index: 2.6.23-rc1-git7/arch/i386/kernel/smp.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/i386/kernel/smp.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/i386/kernel/smp.c 2007-07-30 19:08:07.000000000 -0400
@@ -342,6 +342,7 @@
smp_mb__after_clear_bit();
out:
put_cpu_no_resched();
+ __get_cpu_var(irq_stat).irq_tlb_counts++;
}

void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
@@ -640,6 +641,7 @@
fastcall void smp_reschedule_interrupt(struct pt_regs *regs)
{
ack_APIC_irq();
+ __get_cpu_var(irq_stat).irq_resched_counts++;
}

fastcall void smp_call_function_interrupt(struct pt_regs *regs)
@@ -666,6 +668,7 @@
mb();
atomic_inc(&call_data->finished);
}
+ __get_cpu_var(irq_stat).irq_call_counts++;
}

static int convert_apicid_to_cpu(int apic_id)
Index: 2.6.23-rc1-git7/arch/x86_64/kernel/apic.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/x86_64/kernel/apic.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/x86_64/kernel/apic.c 2007-07-30 19:08:07.000000000 -0400
@@ -1118,6 +1118,7 @@
asmlinkage void smp_spurious_interrupt(void)
{
unsigned int v;
+
exit_idle();
irq_enter();
/*
@@ -1130,6 +1131,7 @@
ack_APIC_irq();

irq_exit();
+ add_pda(irq_spur_counts, 1);
}

/*
Index: 2.6.23-rc1-git7/arch/x86_64/kernel/irq.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/x86_64/kernel/irq.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/x86_64/kernel/irq.c 2007-07-30 19:10:22.000000000 -0400
@@ -88,11 +88,41 @@
seq_printf(p, "NMI: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
- seq_putc(p, '\n');
+ seq_printf(p, " Non-maskable interrupts\n");
seq_printf(p, "LOC: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
- seq_putc(p, '\n');
+ seq_printf(p, " Local interrupts\n");
+#ifdef CONFIG_SMP
+ seq_printf(p, "RES: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_resched_counts);
+ seq_printf(p, " Rescheduling interrupts\n");
+#endif
+#ifdef CONFIG_SMP
+ seq_printf(p, "CAL: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_call_counts);
+ seq_printf(p, " function call interrupts\n");
+#endif
+#ifdef CONFIG_SMP
+ seq_printf(p, "TLB: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_tlb_counts);
+ seq_printf(p, " TLB shootdowns\n");
+#endif
+ seq_printf(p, "TRM: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_thermal_counts);
+ seq_printf(p, " Thermal event interrupts\n");
+ seq_printf(p, "THR: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_threshold_counts);
+ seq_printf(p, " Threshold APIC interrupts\n");
+ seq_printf(p, "SPU: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_spur_counts);
+ seq_printf(p, " Spurious interrupts\n");
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
}
return 0;
Index: 2.6.23-rc1-git7/arch/x86_64/kernel/mce_amd.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/x86_64/kernel/mce_amd.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/x86_64/kernel/mce_amd.c 2007-07-30 19:08:07.000000000 -0400
@@ -238,6 +238,7 @@
}
out:
irq_exit();
+ add_pda(irq_threshold_counts, 1);
}

/*
Index: 2.6.23-rc1-git7/arch/x86_64/kernel/mce_intel.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/x86_64/kernel/mce_intel.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/x86_64/kernel/mce_intel.c 2007-07-30 19:08:07.000000000 -0400
@@ -27,6 +27,7 @@
mce_log_therm_throt_event(smp_processor_id(), msr_val);

irq_exit();
+ add_pda(irq_thermal_counts, 1);
}

static void __cpuinit intel_init_thermal(struct cpuinfo_x86 *c)
Index: 2.6.23-rc1-git7/arch/x86_64/kernel/smp.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/x86_64/kernel/smp.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/x86_64/kernel/smp.c 2007-07-30 19:08:07.000000000 -0400
@@ -163,6 +163,7 @@
out:
ack_APIC_irq();
cpu_clear(cpu, f->flush_cpumask);
+ add_pda(irq_tlb_counts, 1);
}

static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
@@ -493,6 +494,7 @@
asmlinkage void smp_reschedule_interrupt(void)
{
ack_APIC_irq();
+ add_pda(irq_resched_counts, 1);
}

asmlinkage void smp_call_function_interrupt(void)
@@ -519,5 +521,6 @@
mb();
atomic_inc(&call_data->finished);
}
+ add_pda(irq_call_counts, 1);
}

Index: 2.6.23-rc1-git7/include/asm-i386/hardirq.h
===================================================================
--- 2.6.23-rc1-git7.orig/include/asm-i386/hardirq.h 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/include/asm-i386/hardirq.h 2007-07-30 19:08:07.000000000 -0400
@@ -9,6 +9,11 @@
unsigned long idle_timestamp;
unsigned int __nmi_count; /* arch dependent */
unsigned int apic_timer_irqs; /* arch dependent */
+ unsigned int irq_resched_counts;
+ unsigned int irq_call_counts;
+ unsigned int irq_tlb_counts;
+ unsigned int irq_thermal_counts;
+ unsigned int irq_spur_counts;
} ____cacheline_aligned irq_cpustat_t;

DECLARE_PER_CPU(irq_cpustat_t, irq_stat);
Index: 2.6.23-rc1-git7/include/asm-x86_64/pda.h
===================================================================
--- 2.6.23-rc1-git7.orig/include/asm-x86_64/pda.h 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/include/asm-x86_64/pda.h 2007-07-30 19:08:07.000000000 -0400
@@ -29,6 +29,12 @@
short isidle;
struct mm_struct *active_mm;
unsigned apic_timer_irqs;
+ unsigned irq_resched_counts;
+ unsigned irq_call_counts;
+ unsigned irq_tlb_counts;
+ unsigned irq_thermal_counts;
+ unsigned irq_threshold_counts;
+ unsigned irq_spur_counts;
} ____cacheline_aligned_in_smp;

extern struct x8664_pda *_cpu_pda[];
Index: 2.6.23-rc1-git7/arch/i386/mach-voyager/voyager_smp.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/i386/mach-voyager/voyager_smp.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/i386/mach-voyager/voyager_smp.c 2007-07-30 19:08:07.000000000 -0400
@@ -1042,6 +1042,7 @@
mb();
clear_bit(cpu, &call_data->finished);
}
+ __get_cpu_var(irq_stat).irq_call_counts++;
}

static int
Index: 2.6.23-rc1-git7/arch/i386/xen/smp.c
===================================================================
--- 2.6.23-rc1-git7.orig/arch/i386/xen/smp.c 2007-07-30 19:08:05.000000000 -0400
+++ 2.6.23-rc1-git7/arch/i386/xen/smp.c 2007-07-30 19:08:07.000000000 -0400
@@ -352,6 +352,7 @@
mb(); /* commit everything before setting finished */
atomic_inc(&call_data->finished);
}
+ __get_cpu_var(irq_stat).irq_call_counts++;

return IRQ_HANDLED;
}
-
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