linux-kernel - Re: [PATCH 1/2] perf archive: Fix filtering of empty build-ids

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Date:   Wed, 3 Mar 2021 12:56:04 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Nicholas Fraser <nfraser@...eweavers.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
        Ulrich Czekalla <uczekalla@...eweavers.com>,
        Huw Davies <huw@...eweavers.com>
Subject: Re: [PATCH 1/2] perf archive: Fix filtering of empty build-ids

Em Wed, Feb 24, 2021 at 02:50:20PM +0100, Jiri Olsa escreveu:
> On Fri, Feb 19, 2021 at 11:09:32AM -0500, Nicholas Fraser wrote:
> > A non-existent build-id used to be treated as all-zero SHA-1 hash.
> > Build-ids are now variable width. A non-existent build-id is an empty
> > string and "perf buildid-list" pads this with spaces. This is true even
> > when using old perf.data files recorded from older versions of perf;
> > "perf buildid-list" never reports an all-zero hash anymore.
> > 
> > This fixes "perf-archive" to skip missing build-ids by skipping lines
> > that start with a padding space rather than with zeroes.
> > 
> > Signed-off-by: Nicholas Fraser <nfraser@...eweavers.com>
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks, applied.

- Arnaldo

 
> thanks,
> jirka
> 
> > ---
> >  tools/perf/perf-archive.sh | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/tools/perf/perf-archive.sh b/tools/perf/perf-archive.sh
> > index 0cfb3e2cefef..133f0eddbcc4 100644
> > --- a/tools/perf/perf-archive.sh
> > +++ b/tools/perf/perf-archive.sh
> > @@ -20,9 +20,8 @@ else
> >  fi
> >  
> >  BUILDIDS=$(mktemp /tmp/perf-archive-buildids.XXXXXX)
> > -NOBUILDID=0000000000000000000000000000000000000000
> >  
> > -perf buildid-list -i $PERF_DATA --with-hits | grep -v "^$NOBUILDID " > $BUILDIDS
> > +perf buildid-list -i $PERF_DATA --with-hits | grep -v "^ " > $BUILDIDS
> >  if [ ! -s $BUILDIDS ] ; then
> >  	echo "perf archive: no build-ids found"
> >  	rm $BUILDIDS || true
> > -- 
> > 2.30.1
> > 
> 

-- 

- Arnaldo