linux-kernel - Re: Add fine grained sampled metrics for perf script

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Date:   Thu, 23 Nov 2017 14:46:17 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>, jolsa@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Add fine grained sampled metrics for perf script

Em Thu, Nov 23, 2017 at 08:47:42AM +0100, Jiri Olsa escreveu:
> On Fri, Nov 17, 2017 at 01:42:57PM -0800, Andi Kleen wrote:
> 
> SNIP
> 
> > TopDown:
> > 
> > Note TopDown requires disabling SMT if you have it enabled (e.g. by offlining
> > the extra CPUs), because SMT would require sampling per core, which is not supported.
> > 
> > $ perf record -e '{ref-cycles,topdown-fetch-bubbles,topdown-recovery-bubbles,\
> > topdown-slots-retired,topdown-total-slots,topdown-slots-issued}:S' -a sleep 1
> > $ perf script --header -I -F cpu,ip,sym,event,metric,period
> > ...
> > [000]     121108               ref-cycles:  ffffffff8165222e copy_user_enhanced_fast_string
> > [000]     190350    topdown-fetch-bubbles:  ffffffff8165222e copy_user_enhanced_fast_string
> > [000]       2055 topdown-recovery-bubbles:  ffffffff8165222e copy_user_enhanced_fast_string
> > [000]     148729    topdown-slots-retired:  ffffffff8165222e copy_user_enhanced_fast_string
> > [000]     144324      topdown-total-slots:  ffffffff8165222e copy_user_enhanced_fast_string
> > [000]     160852     topdown-slots-issued:  ffffffff8165222e copy_user_enhanced_fast_string
> > [000]   metric:     33.0% frontend bound
> > [000]   metric:      3.5% bad speculation
> > [000]   metric:     25.8% retiring
> > [000]   metric:     37.7% backend bound
> > [000]     112112               ref-cycles:  ffffffff8165aec8 _raw_spin_lock_irqsave
> > [000]     357222    topdown-fetch-bubbles:  ffffffff8165aec8 _raw_spin_lock_irqsave
> > [000]       3325 topdown-recovery-bubbles:  ffffffff8165aec8 _raw_spin_lock_irqsave
> > [000]     323553    topdown-slots-retired:  ffffffff8165aec8 _raw_spin_lock_irqsave
> > [000]     270507      topdown-total-slots:  ffffffff8165aec8 _raw_spin_lock_irqsave
> > [000]     341226     topdown-slots-issued:  ffffffff8165aec8 _raw_spin_lock_irqsave
> > [000]   metric:     33.0% frontend bound
> > [000]   metric:      2.9% bad speculation
> > [000]   metric:     29.9% retiring
> > [000]   metric:     34.2% backend bound
> > 
> > 
> > Git tree:
> > git://git.kernel.org/pub/scm/limux/kernel/git/ak/linux-misc.git perf/script-metric-3
> > 
> > 
> > v1: Initial post
> > v2: 
> > Remove already merged patches.
> > Use evsel->priv for new fields
> > Port to new base line, support fp output.
> > Handle stats in ->stats, not ->priv
> > Minor cleanups
> > v3:
> > Enable EVENT_UPDATE in perf record, and record unit/scale/cpu map/thread map
> > Drop the previous zero cpu map hack.
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Thanks, applied, and added the detailed explanation about the use of the
term 'averaging' done by Andi,

- Arnaldo