Messages in this thread Patch in this message | | | From | Don Zickus <> | Subject | [V5][PATCH 6/6] x86, nmi: print out NMI stats in /proc/interrupts | Date | Tue, 20 Sep 2011 10:43:12 -0400 |
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This is a cheap hack to add the stats to the middle of /proc/interrupts. It is more of a conversation starter than anything as I am not sure the right letters and place to put this stuff.
The benefit of these stats is a better breakdown of which list the NMIs get handled in either a normal handler, unknown, or external. It also list the number of unknown NMIs swallowed to help check for false positives or not. Another benefit is the ability to actually see which NMI handlers are currently registered in the system.
The output of 'cat /proc/interrupts/ will look like this:
<snip> 58: 275 0 864 0 PCI-MSI-edge eth0 NMI: 4161 4155 158 4194 Non-maskable interrupts SWA: 0 0 0 0 Unknown NMIs swallowed 0: 4161 4155 158 4194 NMI PMI, arch_bt UNK: 0 0 0 0 NMI EXT: 0 0 0 0 NMI LOC: 12653 13304 13974 12926 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 6 6 5 6 Performance monitoring interrupts IWI: 0 0 0 0 IRQ work interrupts RES: 1839 1897 1821 1854 Rescheduling interrupts CAL: 524 2714 392 331 Function call interrupts TLB: 217 146 593 576 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 1 1 1 1 Machine check polls ERR: 0 MIS: 0
Signed-off-by: Don Zickus <dzickus@redhat.com> --- arch/x86/include/asm/nmi.h | 2 + arch/x86/kernel/irq.c | 2 + arch/x86/kernel/nmi.c | 47 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/nmi.h b/arch/x86/include/asm/nmi.h index fc74547..a4f1945 100644 --- a/arch/x86/include/asm/nmi.h +++ b/arch/x86/include/asm/nmi.h @@ -24,6 +24,8 @@ void arch_trigger_all_cpu_backtrace(void); #define NMI_FLAG_FIRST 1 +void arch_show_nmi(struct seq_file *p, int prec); + enum { NMI_LOCAL=0, NMI_UNKNOWN, diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index 6c0802e..44d1cac 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -16,6 +16,7 @@ #include <asm/idle.h> #include <asm/mce.h> #include <asm/hw_irq.h> +#include <asm/nmi.h> atomic_t irq_err_count; @@ -55,6 +56,7 @@ int arch_show_interrupts(struct seq_file *p, int prec) for_each_online_cpu(j) seq_printf(p, "%10u ", irq_stats(j)->__nmi_count); seq_printf(p, " Non-maskable interrupts\n"); + arch_show_nmi(p, prec); #ifdef CONFIG_X86_LOCAL_APIC seq_printf(p, "%*s: ", prec, "LOC"); for_each_online_cpu(j) diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c index bb8242e..5619ae9 100644 --- a/arch/x86/kernel/nmi.c +++ b/arch/x86/kernel/nmi.c @@ -424,3 +424,50 @@ void restart_nmi(void) { ignore_nmis--; } + +void arch_show_nmi(struct seq_file *p, int prec) +{ + int j; + struct nmiaction *action; + + seq_printf(p, "%*s: ", prec, "SWA"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(nmi_stats.swallow, j)); + seq_printf(p, " Unknown NMIs swallowed\n"); + + seq_printf(p, "%*s: ", prec, " 0"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(nmi_stats.normal, j)); + seq_printf(p, " NMI"); + action = (nmi_to_desc(NMI_LOCAL))->head; + if (action) { + seq_printf(p, "\t%s", action->name); + while ((action = action->next) != NULL) + seq_printf(p, ", %s", action->name); + } + seq_putc(p, '\n'); + + seq_printf(p, "%*s: ", prec, "UNK"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(nmi_stats.unknown, j)); + seq_printf(p, " NMI"); + action = (nmi_to_desc(NMI_UNKNOWN))->head; + if (action) { + seq_printf(p, "\t%s", action->name); + while ((action = action->next) != NULL) + seq_printf(p, ", %s", action->name); + } + seq_putc(p, '\n'); + + seq_printf(p, "%*s: ", prec, "EXT"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(nmi_stats.external, j)); + seq_printf(p, " NMI"); + action = (nmi_to_desc(NMI_EXTERNAL))->head; + if (action) { + seq_printf(p, "\t%s", action->name); + while ((action = action->next) != NULL) + seq_printf(p, ", %s", action->name); + } + seq_putc(p, '\n'); +} -- 1.7.6
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