From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758778Ab1I3TIH (ORCPT ); Fri, 30 Sep 2011 15:08:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38102 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758724Ab1I3TH0 (ORCPT ); Fri, 30 Sep 2011 15:07:26 -0400 From: Don Zickus To: , Andi Kleen , Robert Richter , Peter Zijlstra , ying.huang@intel.com Cc: LKML , paulmck@linux.vnet.ibm.com, avi@redhat.com, jeremy@goop.org, Don Zickus Subject: [V7][PATCH 5/6] x86, nmi: track NMI usage stats Date: Fri, 30 Sep 2011 15:06:23 -0400 Message-Id: <1317409584-23662-6-git-send-email-dzickus@redhat.com> In-Reply-To: <1317409584-23662-1-git-send-email-dzickus@redhat.com> References: <1317409584-23662-1-git-send-email-dzickus@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that the NMI handler are broken into lists, increment the appropriate stats for each list. This allows us to see what is going on when they get printed out in the next patch. Signed-off-by: Don Zickus --- arch/x86/kernel/nmi.c | 20 ++++++++++++++++++-- 1 files changed, 18 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c index fa725a4..36b16fa 100644 --- a/arch/x86/kernel/nmi.c +++ b/arch/x86/kernel/nmi.c @@ -53,6 +53,15 @@ static struct nmi_desc nmi_desc[NMI_MAX] = }; +struct nmi_stats { + unsigned int normal; + unsigned int unknown; + unsigned int external; + unsigned int swallow; +}; + +static DEFINE_PER_CPU(struct nmi_stats, nmi_stats); + static int ignore_nmis; int unknown_nmi_panic; @@ -262,8 +271,13 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs) * if it caused the NMI) */ handled = nmi_handle(NMI_UNKNOWN, regs, false); - if (handled) + if (handled) { + __this_cpu_add(nmi_stats.unknown, handled); return; + } + + __this_cpu_add(nmi_stats.unknown, 1); + #ifdef CONFIG_MCA /* * Might actually be able to figure out what the guilty party @@ -314,6 +328,7 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs) __this_cpu_write(last_nmi_rip, regs->ip); handled = nmi_handle(NMI_LOCAL, regs, b2b); + __this_cpu_add(nmi_stats.normal, handled); if (handled) { /* * There are cases when a NMI handler handles multiple @@ -344,6 +359,7 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs) */ reassert_nmi(); #endif + __this_cpu_add(nmi_stats.external, 1); raw_spin_unlock(&nmi_reason_lock); return; } @@ -380,7 +396,7 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs) * for now. */ if (b2b && __this_cpu_read(swallow_nmi)) - ; + __this_cpu_add(nmi_stats.swallow, 1); else unknown_nmi_error(reason, regs); } -- 1.7.6