Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754220AbaLDKVi (ORCPT ); Thu, 4 Dec 2014 05:21:38 -0500 Received: from mail-yh0-f44.google.com ([209.85.213.44]:51068 "EHLO mail-yh0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752992AbaLDKVe (ORCPT ); Thu, 4 Dec 2014 05:21:34 -0500 MIME-Version: 1.0 In-Reply-To: <547FCB73.1010707@linaro.org> References: <1416292375-29560-1-git-send-email-dave.long@linaro.org> <20141120135851.GA32528@linaro.org> <54759041.9080105@hitachi.com> <20141126100325.GA9157@linaro.org> <5476120D.9030703@linaro.org> <5476BFB4.2020705@hitachi.com> <547C36DB.7060903@hitachi.com> <547F242D.1060705@redhat.com> <547F94B0.1000902@linaro.org> <547FB5DD.901@redhat.com> <547FCB73.1010707@linaro.org> Date: Thu, 4 Dec 2014 10:21:33 +0000 Message-ID: Subject: Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support From: Steve Capper To: David Long Cc: William Cohen , Masami Hiramatsu , "Jon Medhurst (Tixy)" , Russell King , Ananth N Mavinakayanahalli , Sandeepa Prabhu , Catalin Marinas , Will Deacon , "linux-kernel@vger.kernel.org" , Anil S Keshavamurthy , David Miller , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4 December 2014 at 02:48, David Long wrote: > On 12/03/14 20:16, William Cohen wrote: > > [...] > >> >> The perf issue seems to be independent and can be reproduced without using >> any kprobe support. I need to get a simple reproducer and mention it on the >> linux-perf-user list. >> >> -Will >> > > > OK, my confusion came from all the different things perf can use. I have > not yet been able to reproduce the "perf stat" failure, but I do see the > failure with Steve's example using tracepoints. I had thought that was > using kprobes, but apparently it just uses tracepoints. These look like two > different failures to me: One related to tracepoints, and one in the PMU > driver. > > Since this seems unrelated to kprobes I don't plan on pursuing these > particular problems. > > -dl > Sorry for the late reply... The example I had was: echo "p:memcpy memcpy %x2" > /sys/kernel/debug/tracing/kprobe_events perf record -e kprobes:memcpy -a sleep 5 [then crash due to IRQs being unexpectedly disabled in the ext4 code] Isn't that a kprobe problem? Cheers, -- Steve -- 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/