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

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Date:   Thu, 23 Nov 2017 08:47:42 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: Add fine grained sampled metrics for perf script

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,
jirka