linux-kernel - Re: [PATCH 08/10] perf tools: Add other metrics to hash data

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Date:   Sun, 28 Jun 2020 23:56:48 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...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>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 08/10] perf tools: Add other metrics to hash data

On Fri, Jun 26, 2020 at 02:16:30PM -0700, Ian Rogers wrote:
> On Fri, Jun 26, 2020 at 12:48 PM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Adding other metrics to the parsing context so they
> > can be resolved during the metric processing.
> >
> > Adding expr__add_other function to store 'other' metrics
> > into parse context.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/util/expr.c        | 35 +++++++++++++++++++++++++++++++++++
> >  tools/perf/util/expr.h        | 13 ++++++++++++-
> >  tools/perf/util/stat-shadow.c | 19 +++++++++++++------
> >  3 files changed, 60 insertions(+), 7 deletions(-)
> >
> > diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> > index cd73dae4588c..32f7acac7c19 100644
> > --- a/tools/perf/util/expr.c
> > +++ b/tools/perf/util/expr.c
> > @@ -4,6 +4,8 @@
> >  #include <errno.h>
> >  #include <stdlib.h>
> >  #include <string.h>
> > +#include "metricgroup.h"
> > +#include "debug.h"
> >  #include "expr.h"
> >  #include "expr-bison.h"
> >  #include "expr-flex.h"
> > @@ -61,6 +63,7 @@ int expr__add_val(struct expr_parse_ctx *ctx, const char *name, double val)
> >         if (!data_ptr)
> >                 return -ENOMEM;
> >         data_ptr->val = val;
> > +       data_ptr->is_other = false;
> >
> >         ret = hashmap__set(&ctx->ids, name, data_ptr,
> >                            (const void **)&old_key, (void **)&old_data);
> > @@ -69,6 +72,38 @@ int expr__add_val(struct expr_parse_ctx *ctx, const char *name, double val)
> >         return ret;
> >  }
> >
> > +int expr__add_other(struct expr_parse_ctx *ctx, struct metric_other *other)
> > +{
> > +       struct expr_parse_data *data_ptr = NULL, *old_data = NULL;
> > +       char *old_key = NULL;
> > +       char *name;
> > +       int ret;
> > +
> > +       data_ptr = malloc(sizeof(*data_ptr));
> > +       if (!data_ptr)
> > +               return -ENOMEM;
> > +
> > +       name = strdup(other->metric_name);
> > +       if (!name) {
> > +               free(data_ptr);
> > +               return -ENOMEM;
> > +       }
> > +
> > +       data_ptr->other.metric_name = other->metric_name;
> > +       data_ptr->other.metric_expr = other->metric_expr;
> > +       data_ptr->is_other = true;
> > +
> > +       ret = hashmap__set(&ctx->ids, name, data_ptr,
> > +                          (const void **)&old_key, (void **)&old_data);
> > +
> > +       pr_debug2("adding other metric %s: %s\n",
> > +                 other->metric_name, other->metric_expr);
> > +
> > +       free(old_key);
> > +       free(old_data);
> > +       return ret;
> > +}
> > +
> >  int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
> >                  struct expr_parse_data **data)
> >  {
> > diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
> > index fd924bb4e5cd..ed60f9227b43 100644
> > --- a/tools/perf/util/expr.h
> > +++ b/tools/perf/util/expr.h
> > @@ -11,12 +11,22 @@
> >  #include "util/hashmap.h"
> >  //#endif
> >
> > +struct metric_other;
> > +
> >  struct expr_parse_ctx {
> >         struct hashmap ids;
> >  };
> >
> >  struct expr_parse_data {
> > -       double  val;
> > +       bool    is_other;
> > +
> > +       union {
> > +               double  val;
> > +               struct {
> > +                       const char *metric_name;
> > +                       const char *metric_expr;
> 
> It is probably worth a comment why both the metric_name and the
> metric's expression are required here? The parse and other data for
> the metric won't be here.

it's there to have it ready when processing the metric,
I'll add some more comments in here

thanks,
jirka