Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757551Ab2FTSrE (ORCPT ); Wed, 20 Jun 2012 14:47:04 -0400 Received: from ch1ehsobe003.messaging.microsoft.com ([216.32.181.183]:5105 "EHLO ch1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756659Ab2FTSq6 (ORCPT ); Wed, 20 Jun 2012 14:46:58 -0400 X-Forefront-Antispam-Report: CIP:163.181.249.108;KIP:(null);UIP:(null);IPV:NLI;H:ausb3twp01.amd.com;RD:none;EFVD:NLI X-SpamScore: 0 X-BigFish: VPS0(zzzz1202hzz8275bhz2dh668h839hd24he5bhf0ah) X-WSS-ID: 0M5XIU5-01-38W-02 X-M-MSG: From: Robert Richter To: Peter Zijlstra CC: Ingo Molnar , Stephane Eranian , LKML , Robert Richter Subject: [PATCH 4/4] perf, x86: Improve debug output in check_hw_exists() Date: Wed, 20 Jun 2012 20:46:36 +0200 Message-ID: <1340217996-2254-5-git-send-email-robert.richter@amd.com> X-Mailer: git-send-email 1.7.8.4 In-Reply-To: <1340217996-2254-1-git-send-email-robert.richter@amd.com> References: <1340217996-2254-1-git-send-email-robert.richter@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: amd.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1066 Lines: 37 It might be of interest which perfctr msr failed. Signed-off-by: Robert Richter --- arch/x86/kernel/cpu/perf_event.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index bb340dc..8d29a35 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -178,7 +178,7 @@ static void release_pmc_hardware(void) {} static bool check_hw_exists(void) { - u64 val, val_new = 0; + u64 val, val_new = ~0; int i, reg, ret = 0; /* @@ -229,6 +229,7 @@ bios_fail: msr_fail: printk(KERN_CONT "Broken PMU hardware detected, using software events only.\n"); + printk(KERN_ERR "Failed to access perfctr msr (MSR %x is %Lx)\n", reg, val_new); return false; } -- 1.7.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/