Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [6/28] x86: MCE: Add machine check exception count in /proc/interrupts | Date | Tue, 7 Apr 2009 17:07:47 +0200 (CEST) |
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Impact: feature, debugging tool
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.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
--- arch/x86/include/asm/mce.h | 3 +++ arch/x86/kernel/cpu/mcheck/mce_64.c | 4 ++++ arch/x86/kernel/irq.c | 10 ++++++++++ 3 files changed, 17 insertions(+)
Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c =================================================================== --- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c 2009-04-07 16:09:59.000000000 +0200 +++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c 2009-04-07 16:43:14.000000000 +0200 @@ -75,6 +75,8 @@ rdtscll(m->tsc); } +DEFINE_PER_CPU(unsigned, mce_exception_count); + /* * Lockless MCE logging infrastructure. * This avoids deadlocks on printk locks without having to break locks. Also @@ -285,6 +287,8 @@ atomic_inc(&mce_entry); + __get_cpu_var(mce_exception_count)++; + if (notify_die(DIE_NMI, "machine check", regs, error_code, 18, SIGKILL) == NOTIFY_STOP) goto out2; Index: linux/arch/x86/include/asm/mce.h =================================================================== --- linux.orig/arch/x86/include/asm/mce.h 2009-04-07 16:09:59.000000000 +0200 +++ linux/arch/x86/include/asm/mce.h 2009-04-07 16:43:10.000000000 +0200 @@ -93,6 +93,7 @@ #else /* CONFIG_X86_32 */ #include <asm/atomic.h> +#include <linux/percpu.h> void mce_setup(struct mce *m); void mce_log(struct mce *m); @@ -127,6 +128,8 @@ extern int mce_available(struct cpuinfo_x86 *c); +DECLARE_PER_CPU(unsigned, mce_exception_count); + void mce_log_therm_throt_event(__u64 status); extern atomic_t mce_entry; Index: linux/arch/x86/kernel/irq.c =================================================================== --- linux.orig/arch/x86/kernel/irq.c 2009-04-07 16:09:56.000000000 +0200 +++ linux/arch/x86/kernel/irq.c 2009-04-07 16:09:59.000000000 +0200 @@ -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; @@ -96,6 +97,12 @@ 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)); @@ -163,6 +170,9 @@ { 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;
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