x86, mce: add machine check exception count in /proc/interrupts
Useful for debugging, but it's also good general policy
to have a counter for all special interrupts there. This makes it easier
to diagnose where a CPU is spending its time.
[ Impact: feature, debugging tool ]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index a05660b..05fc635 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -12,6 +12,7 @@
#include <asm/io_apic.h>
#include <asm/irq.h>
#include <asm/idle.h>
+#include <asm/mce.h>
atomic_t irq_err_count;
@@ -94,6 +95,12 @@
seq_printf(p, " Threshold APIC interrupts\n");
# endif
#endif
+#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
+ seq_printf(p, "%*s: ", prec, "MCE");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", per_cpu(mce_exception_count, j));
+ seq_printf(p, " Machine check exceptions\n");
+#endif
seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
@@ -161,6 +168,9 @@
{
u64 sum = irq_stats(cpu)->__nmi_count;
+#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
+ sum += per_cpu(mce_exception_count, cpu);
+#endif
#ifdef CONFIG_X86_LOCAL_APIC
sum += irq_stats(cpu)->apic_timer_irqs;
sum += irq_stats(cpu)->irq_spurious_count;