From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752283Ab2KFPuh (ORCPT ); Tue, 6 Nov 2012 10:50:37 -0500 Received: from mail-gh0-f174.google.com ([209.85.160.174]:53158 "EHLO mail-gh0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751154Ab2KFPug (ORCPT ); Tue, 6 Nov 2012 10:50:36 -0500 Date: Tue, 6 Nov 2012 12:50:28 -0300 From: Arnaldo Carvalho de Melo To: Stephane Eranian Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, mingo@elte.hu, ak@linux.intel.com, jolsa@redhat.com, namhyung.kim@lge.com Subject: Re: [PATCH v2 14/16] perf tools: add new mem command for memory access profiling Message-ID: <20121106155028.GB13629@infradead.org> References: <1352123463-7346-1-git-send-email-eranian@google.com> <1352123463-7346-15-git-send-email-eranian@google.com> <20121106154446.GA13629@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20121106154446.GA13629@infradead.org> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.20 (2009-12-10) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Tue, Nov 06, 2012 at 12:44:46PM -0300, Arnaldo Carvalho de Melo escreveu: > [root@sandy ~]# perf record -g -a -e cpu/mem-stores/ > ^C[ perf record: Woken up 25 times to write data ] > [ perf record: Captured and wrote 7.419 MB perf.data (~324160 samples) ] > > Yay, got some numbers. But then the results out of: $ perf mem -t load rep --stdio Are bogus at least on the callchains: # ======== # captured on: Tue Nov 6 12:46:21 2012 # hostname : sandy.ghostprotocols.net # os release : 3.7.0-rc2+ # perf version : 3.7.rc4.gfaa41f # arch : x86_64 # nrcpus online : 8 # nrcpus avail : 8 # cpudesc : Intel(R) Core(TM) i7-2920XM CPU @ 2.50GHz # cpuid : GenuineIntel,6,42,7 # total memory : 16220228 kB # cmdline : /home/acme/bin/perf record -g -a -e cpu/mem-stores/ # event : name = cpu/mem-stores/, type = 4, config = 0x2cd, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_ho # HEADER_CPU_TOPOLOGY info available, use -I to display # HEADER_NUMA_TOPOLOGY info available, use -I to display # pmu mappings: cpu = 4, software = 1, tracepoint = 2, uncore_cbox_0 = 6, uncore_cbox_1 = 7, uncore_cbox_2 = 8, uncore_cbox_3 # ======== # # Samples: 98 of event 'cpu/mem-stores/' # Total cost : 98 # Sort order : cost,mem,sym,dso,symbol_daddr,dso_daddr,snoop,tlb,locked # # Overhead Samples Cost Memory access Symbol Share # ........ ........... ....... ........................ .............................................. .................. # 19.39% 19 N/A [k] csd_unlock [kernel.kallsyms] | --- csd_unlock | |--6242.11%-- generic_smp_call_function_single_interrupt | smp_call_function_single_interrupt | call_function_single_interrupt | cpuidle_enter | cpuidle_enter_state | cpuidle_idle_call | cpu_idle | | | |--85.08%-- start_secondary | | | --14.92%-- rest_init | start_kernel | x86_64_start_reservations | x86_64_start_kernel | |--100.00%-- smp_call_function_single_interrupt | call_function_single_interrupt | cpuidle_enter | cpuidle_enter_state | cpuidle_idle_call | cpu_idle | start_secondary --97088126703734472704.00%-- [...] 5.10% 5 N/A [k] _raw_spin_lock_irqsave [kernel.kallsyms] | Ideas? - Arnaldo