linux-kernel - Re: [PATCH 03/10] perf tools: Add expr__add

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Message-ID: <CAP-5=fXHKWeFCpG3mWchj5Oa+WPnsQBbt00K5MHdJ+u3U=extg@mail.gmail.com>
Date:   Fri, 26 Jun 2020 13:07:24 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     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 03/10] perf tools: Add expr__add_id function

On Fri, Jun 26, 2020 at 12:47 PM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding expr__add_id function to data for ID
> with zero value, which is used when scanning
> the expression for IDs.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/expr.c | 29 +++++++++++++++++++++++------
>  tools/perf/util/expr.h |  1 +
>  tools/perf/util/expr.y |  2 +-
>  3 files changed, 25 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index 7573b21e73df..0b6d3a6ce88e 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -32,6 +32,24 @@ static bool key_equal(const void *key1, const void *key2,
>         return !strcmp((const char *)key1, (const char *)key2);
>  }
>
> +/* Caller must make sure id is allocated */
> +int expr__add_id(struct expr_parse_ctx *ctx, const char *name)

Nit, perhaps "id" is more consistent than "name". Perhaps also change
add_val below.

Acked-by: Ian Rogers <irogers@...gle.com>

> +{
> +       struct expr_parse_data *data_ptr = NULL, *old_data = NULL;
> +       char *old_key = NULL;
> +       int ret;
> +
> +       data_ptr = malloc(sizeof(*data_ptr));
> +       if (!data_ptr)
> +               return -ENOMEM;
> +
> +       ret = hashmap__set(&ctx->ids, name, data_ptr,
> +                          (const void **)&old_key, (void **)&old_data);
> +       free(old_key);
> +       free(old_data);
> +       return ret;
> +}
> +
>  /* Caller must make sure id is allocated */
>  int expr__add_val(struct expr_parse_ctx *ctx, const char *name, double val)
>  {
> @@ -39,12 +57,11 @@ int expr__add_val(struct expr_parse_ctx *ctx, const char *name, double val)
>         char *old_key = NULL;
>         int ret;
>
> -       if (val != 0.0) {
> -               data_ptr = malloc(sizeof(*data_ptr));
> -               if (!data_ptr)
> -                       return -ENOMEM;
> -               data_ptr->val = val;
> -       }
> +       data_ptr = malloc(sizeof(*data_ptr));
> +       if (!data_ptr)
> +               return -ENOMEM;
> +       data_ptr->val = val;
> +
>         ret = hashmap__set(&ctx->ids, name, data_ptr,
>                            (const void **)&old_key, (void **)&old_data);
>         free(old_key);
> diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
> index f9f16efe76bc..5452e641acf4 100644
> --- a/tools/perf/util/expr.h
> +++ b/tools/perf/util/expr.h
> @@ -26,6 +26,7 @@ struct expr_scanner_ctx {
>
>  void expr__ctx_init(struct expr_parse_ctx *ctx);
>  void expr__ctx_clear(struct expr_parse_ctx *ctx);
> +int expr__add_id(struct expr_parse_ctx *ctx, const char *name);
>  int expr__add_val(struct expr_parse_ctx *ctx, const char *id, double val);
>  int expr__get_id(struct expr_parse_ctx *ctx, const char *id, double *val_ptr);
>  int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
> diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
> index ff5e5f6e170d..ac4b119877e0 100644
> --- a/tools/perf/util/expr.y
> +++ b/tools/perf/util/expr.y
> @@ -71,7 +71,7 @@ all_other: all_other other
>
>  other: ID
>  {
> -       expr__add_val(ctx, $1, 0.0);
> +       expr__add_id(ctx, $1);
>  }
>  |
>  MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
> --
> 2.25.4
>