linux-kernel - Re: [PATCH 05/10] perf tools: Add expr__del

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Message-ID: <CAP-5=fWKPRYJ3D264=qKVyRs15n-tNPqPfqv_dL2q15KGzTeaw@mail.gmail.com>
Date:   Fri, 26 Jun 2020 13:55:37 -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 05/10] perf tools: Add expr__del_id function

On Fri, Jun 26, 2020 at 12:47 PM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding expr__del_id function to remove ID from hashmap.
> It will save us few lines in following changes.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/expr.c | 21 +++++++++++++--------
>  tools/perf/util/expr.h |  1 +
>  2 files changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index 29cdef18849c..aa14c7111ecc 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -75,6 +75,17 @@ int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
>         return hashmap__find(&ctx->ids, id, (void **)data) ? 0 : -1;
>  }
>
> +void expr__del_id(struct expr_parse_ctx *ctx, const char *id)
> +{
> +       struct expr_parse_data *old_val = NULL;
> +       char *old_key = NULL;
> +
> +       hashmap__delete(&ctx->ids, id,
> +                       (const void **)&old_key, (void **)&old_val);
> +       free(old_key);
> +       free(old_val);
> +}
> +
>  void expr__ctx_init(struct expr_parse_ctx *ctx)
>  {
>         hashmap__init(&ctx->ids, key_hash, key_equal, NULL);
> @@ -132,16 +143,10 @@ int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
>  int expr__find_other(const char *expr, const char *one,
>                      struct expr_parse_ctx *ctx, int runtime)
>  {
> -       struct expr_parse_data *old_val = NULL;
> -       char *old_key = NULL;
>         int ret = __expr__parse(NULL, ctx, expr, EXPR_OTHER, runtime);
>
> -       if (one) {
> -               hashmap__delete(&ctx->ids, one,
> -                               (const void **)&old_key, (void **)&old_val);
> -               free(old_key);
> -               free(old_val);
> -       }
> +       if (one)
> +               expr__del_id(ctx, one);

Nit, I always have to read the code to know why we have "one" as an
argument. Could we remove it as an argument and have the caller use
expr__del_id?

Thanks,
Ian

>         return ret;
>  }
> diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
> index 0af5b887b6c7..1a76b002c576 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);
> +void expr__del_id(struct expr_parse_ctx *ctx, const char *id);
>  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,
> --
> 2.25.4
>