lkml.org 
[lkml]   [2017]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 3/3] perf, tools, script: Allow computing metrics in perf script
On Mon, Nov 20, 2017 at 10:04:19AM +0100, Jiri Olsa wrote:
> On Fri, Nov 17, 2017 at 01:43:00PM -0800, Andi Kleen wrote:
>
> SNIP
>
> > ---
> > tools/perf/Documentation/perf-script.txt | 10 +++-
> > tools/perf/builtin-script.c | 97 +++++++++++++++++++++++++++++++-
> > tools/perf/util/metricgroup.c | 4 ++
> > 3 files changed, 108 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
> > index 2811fcf684cb..974ceb12c7f3 100644
> > --- a/tools/perf/Documentation/perf-script.txt
> > +++ b/tools/perf/Documentation/perf-script.txt
> > @@ -117,7 +117,7 @@ OPTIONS
> > Comma separated list of fields to print. Options are:
> > comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, symoff,
> > srcline, period, iregs, uregs, brstack, brstacksym, flags, bpf-output, brstackinsn,
> > - brstackoff, callindent, insn, insnlen, synth, phys_addr.
> > + brstackoff, callindent, insn, insnlen, synth, phys_addr, metric.
> > Field list can be prepended with the type, trace, sw or hw,
> > to indicate to which event type the field list applies.
> > e.g., -F sw:comm,tid,time,ip,sym and -F trace:time,cpu,trace
> > @@ -217,6 +217,14 @@ OPTIONS
> >
> > The brstackoff field will print an offset into a specific dso/binary.
> >
> > + With the metric option perf script can compute metrics for
> > + sampling periods, similar to perf stat. This requires
> > + specifying a group with multiple metrics with the :S option
> > + for perf record. perf will sample on the first event, and
> > + compute metrics for all the events in the group. Please note
> > + that the metric computed is averaged over the whole sampling
> > + period, not just for the sample point.
>
> hum, is it? I see you call perf_stat__reset_shadow_stats for every
> group start.. which I'd think means you see metric for current
> leader sample point

Yes it is.

It's for the complete sampling period because it is computed
over the delta from the last sample to the previous sample.

There isn't really a metric at a point, it is always over a interval.

-Andi

\
 
 \ /
  Last update: 2017-11-20 16:35    [W:0.100 / U:6.260 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site