From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934269AbbHKNiI (ORCPT ); Tue, 11 Aug 2015 09:38:08 -0400 Received: from mga02.intel.com ([134.134.136.20]:63215 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934066AbbHKNiH (ORCPT ); Tue, 11 Aug 2015 09:38:07 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,653,1432623600"; d="scan'208";a="781943617" Date: Tue, 11 Aug 2015 06:38:05 -0700 From: Andi Kleen To: Jiri Olsa Cc: Andi Kleen , acme@kernel.org, jolsa@kernel.org, linux-kernel@vger.kernel.org, eranian@google.com, namhyung@kernel.org, peterz@infradead.org, mingo@kernel.org Subject: Re: [PATCH 2/9] perf, tools, stat: Support up-scaling of events Message-ID: <20150811133805.GD4524@tassilo.jf.intel.com> References: <1438995985-13631-1-git-send-email-andi@firstfloor.org> <1438995985-13631-3-git-send-email-andi@firstfloor.org> <20150811132532.GB1942@krava.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150811132532.GB1942@krava.brq.redhat.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 11, 2015 at 03:25:32PM +0200, Jiri Olsa wrote: > On Fri, Aug 07, 2015 at 06:06:18PM -0700, Andi Kleen wrote: > > From: Andi Kleen > > > > TopDown needs to multiply events by constants (for example > > the CPU Pipeline Width) to get the correct results. > > The kernel needs to export this factor. > > > > Today *.scale is only used to scale down metrics (divide), for example > > to scale bytes to MB. > > > > Repurpose negative scale to mean scaling up, that is multiplying. > > Implement the code for this in perf stat. > > > > Signed-off-by: Andi Kleen > > --- > > tools/perf/builtin-stat.c | 27 +++++++++++++++++++-------- > > 1 file changed, 19 insertions(+), 8 deletions(-) > > > > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c > > index ea5298a..2590c75 100644 > > --- a/tools/perf/builtin-stat.c > > +++ b/tools/perf/builtin-stat.c > > @@ -179,6 +179,17 @@ static inline int nsec_counter(struct perf_evsel *evsel) > > return 0; > > } > > > > +static double scale_val(struct perf_evsel *counter, u64 val) > > +{ > > + double uval = val; > > + > > + if (counter->scale < 0) > > + uval = val * (-counter->scale); > > + else if (counter->scale) > > + uval = val / counter->scale; > > hum, do you change the scale logic? the current scale > 0 works like: > > uval = val * counter->scale; Yes I define negative scales to mean "multiply by" See the description of the kernel patch for more details. -Andi -- ak@linux.intel.com -- Speaking for myself only