linux-kernel - Re: [PATCH V4 00/17] Stitch LBR call stack (Perf Tools)

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Date:   Fri, 17 Apr 2020 18:54:02 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        jolsa@...hat.com, peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, namhyung@...nel.org,
        adrian.hunter@...el.com, mathieu.poirier@...aro.org,
        ravi.bangoria@...ux.ibm.com, alexey.budankov@...ux.intel.com,
        vitaly.slobodskoy@...el.com, pavel.gerasimov@...el.com,
        mpe@...erman.id.au, eranian@...gle.com, ak@...ux.intel.com
Subject: Re: [PATCH V4 00/17] Stitch LBR call stack (Perf Tools)

Em Fri, Apr 17, 2020 at 05:47:49PM -0400, Liang, Kan escreveu:
> 
> 
> On 4/17/2020 1:48 PM, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Mar 19, 2020 at 01:25:00PM -0700, kan.liang@...ux.intel.com escreveu:
> > > For a simple test case tchain_edit with 43 depth of call stacks.
> > > perf record --call-graph lbr -- ./tchain_edit
> > > perf report --stitch-lbr

> > > Without --stitch-lbr, perf report only display 32 depth of call stacks.
> > > With --stitch-lbr, perf report can display all 43 depth of call stacks.
> > > The depth of call stacks increase 34.3%.

> > > Correspondingly, the processing time of perf report increases 39%,
> > > Without --stitch-lbr:                           11.0 sec
> > > With --stitch-lbr:                              15.3 sec

> > Next time provide the full test proggie, I had to expand those ... to
> > reproduce your results,

> Sure, I will do so in the future.

> > all I have is in perf/core, some patches are
> > still to be processed, will continue later, have to stop now, see:

> > https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/commit/?id=13cfba6b741ff

> > For my testing, looks really great!

> Thanks for the testing. :)

My pleasure.

BTW everything is in there by now.

- Arnaldo