linux-kernel - Re: [PATCHv2 0/5] perf expr: Add flex scanner

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Date:   Thu, 27 Feb 2020 10:46:25 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCHv2 0/5] perf expr: Add flex scanner

Em Thu, Feb 27, 2020 at 01:10:00PM +0100, Jiri Olsa escreveu:
> On Mon, Feb 24, 2020 at 09:29:13AM +0100, Jiri Olsa wrote:
> > hi,
> > while preparing changes for user defined metric expressions
> > I also moved the expression manual parser to flex.
> > 
> > The reason is to have an easy and reasonable way to support
> > and parse multiple user-defined metric expressions from
> > command line or file.
> > 
> > I was posponing the change, but I just saw another update to
> > the expr manual scanner (from Kajol Jain), so cherry picked
> > just the expr flex code changes to get it out.
> > 
> > Kajol Jain,
> > I think it should ease up your change for unknown values marked
> > by '?'. Would you consider rebasing your changes on top of this?
> > 
> > 
> 
> kajoljain found and issue in this one, I'll send v3 as
> soon as he confirms the fix

Ok, I'll hold off processing those patches then, thanks!

- Arnaldo
 
> jirka
> 
> 
> > v2 changes:
> >   - handle special chars properly
> >   - fix return value for expr__parse
> > 
> > Available also in:
> >   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
> >   perf/metric_flex
> > 
> > thanks,
> > jirka
> > 
> > 
> > ---
> > Jiri Olsa (5):
> >       perf expr: Add expr.c object
> >       perf expr: Move expr lexer to flex
> >       perf expr: Increase EXPR_MAX_OTHER
> >       perf expr: Straighten expr__parse/expr__find_other interface
> >       perf expr: Make expr__parse return -1 on error
> > 
> >  tools/perf/tests/expr.c       |  10 +++---
> >  tools/perf/util/Build         |  11 ++++++-
> >  tools/perf/util/expr.c        | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tools/perf/util/expr.h        |   8 ++---
> >  tools/perf/util/expr.l        |  87 +++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tools/perf/util/expr.y        | 208 ++++++++++++++++++++++++++++++++-----------------------------------------------------------------------------------------
> >  tools/perf/util/stat-shadow.c |   4 +--
> >  7 files changed, 272 insertions(+), 168 deletions(-)
> >  create mode 100644 tools/perf/util/expr.c
> >  create mode 100644 tools/perf/util/expr.l
> > 
> 

-- 

- Arnaldo