linux-kernel - Re: [PATCH v3 1/2] perf script: Show branch speculation info

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Date:   Wed, 1 Feb 2023 23:34:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Sandipan Das <sandipan.das@....com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        x86@...nel.org, peterz@...radead.org, bp@...en8.de,
        namhyung@...nel.org, jolsa@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, dave.hansen@...ux.intel.com,
        james.clark@....com, irogers@...gle.com, eranian@...gle.com,
        ananth.narayan@....com, ravi.bangoria@....com,
        santosh.shukla@....com
Subject: Re: [PATCH v3 1/2] perf script: Show branch speculation info

Em Wed, Feb 01, 2023 at 10:13:03PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Jan 30, 2023 at 05:09:10PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Jan 30, 2023 at 04:04:58PM +0530, Sandipan Das escreveu:
> > > On 1/30/2023 11:29 AM, Sandipan Das wrote:
> > > > Show the branch speculation info if provided by the branch recording
> > > > hardware feature. This can be useful for optimizing code further.
> > > > 
> > > > The speculation info is appended to the end of the list of fields so any
> > > > existing tools that use "/" as a delimiter for access fields via an index
> > > > remain unaffected. Also show "-" instead of "N/A" when speculation info
> > > > is unavailable because "/" is used as the field separator.
> > > > 
> > > > E.g.
> > > > 
> > > >   $ perf record -j any,u,save_type ./test_branch
> > > >   $ perf script --fields brstacksym
> > > > 
> > > > Before:
> > > > 
> > > >   [...]
> > > >   check_match+0x60/strcmp+0x0/P/-/-/0/CALL
> > > >   do_lookup_x+0x3c5/check_match+0x0/P/-/-/0/CALL
> > > >   [...]
> > > > 
> > > > After:
> > > > 
> > > >   [...]
> > > >   check_match+0x60/strcmp+0x0/P/-/-/0/CALL/NON_SPEC_CORRECT_PATH
> > > >   do_lookup_x+0x3c5/check_match+0x0/P/-/-/0/CALL/NON_SPEC_CORRECT_PATH
> > > >   [...]
> > > > 
> > > > Signed-off-by: Sandipan Das <sandipan.das@....com>
> > > > ---
> > > >  tools/perf/builtin-script.c |  5 +++--
> > > >  tools/perf/util/branch.c    | 15 +++++++++++++++
> > > >  tools/perf/util/branch.h    |  2 ++
> > > >  tools/perf/util/evsel.c     | 15 ++++++++++++---
> > > >  4 files changed, 32 insertions(+), 5 deletions(-)
> > > > 
> > > 
> > > Sorry but I realized later that this change breaks the builtin branch test.
> > > The additional change below fixes that.
> > 
> > Please wait a bit for people to be able to review the other patches and
> > then submit a v2 series.
> 
> So I applied it manually, no need to send v2.

Please send v2 after figuring out why 'perf test "Sample parsing"'
fails,

I removed both patches for now.

- Arnaldo