x86, mce: add MCE poll count to /proc/interrupts
Keep a count of the machine check polls (or CMCI events) in
/proc/interrupts.
Andi needs this for debugging, but it's also useful in general
to see what's going in by the kernel.
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/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 1156dae..63abf3b 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -125,6 +125,7 @@
int mce_available(struct cpuinfo_x86 *c);
DECLARE_PER_CPU(unsigned, mce_exception_count);
+DECLARE_PER_CPU(unsigned, mce_poll_count);
void mce_log_therm_throt_event(__u64 status);
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 287268d..784f6ae 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -264,6 +264,8 @@
}
}
+DEFINE_PER_CPU(unsigned, mce_poll_count);
+
/*
* Poll for corrected events or events that happened before reset.
* Those are just logged through /dev/mcelog.
@@ -275,6 +277,8 @@
struct mce m;
int i;
+ __get_cpu_var(mce_poll_count)++;
+
mce_setup(&m);
m.mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS);
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 05fc635..eff46b5 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -100,6 +100,10 @@
for_each_online_cpu(j)
seq_printf(p, "%10u ", per_cpu(mce_exception_count, j));
seq_printf(p, " Machine check exceptions\n");
+ seq_printf(p, "%*s: ", prec, "MCP");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
+ seq_printf(p, " Machine check polls\n");
#endif
seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
