linux-kernel - Re: [PATCH 1/3] perf symbols: Add documentation to struct symbol.

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Date:   Thu, 11 Nov 2021 20:04:35 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Martin Liška <mliska@...e.cz>,
        James Clark <james.clark@....com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/3] perf symbols: Add documentation to struct symbol.

Hi Ian,

On Thu, Nov 11, 2021 at 7:51 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Refactor some existing comments and then infer the rest.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>

For all 3 patches,

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/util/symbol.h | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
> index 166196686f2e..3586fa549f44 100644
> --- a/tools/perf/util/symbol.h
> +++ b/tools/perf/util/symbol.h
> @@ -40,22 +40,33 @@ Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
>                              GElf_Shdr *shp, const char *name, size_t *idx);
>  #endif
>
> -/** struct symbol - symtab entry
> - *
> - * @ignore - resolvable but tools ignore it (e.g. idle routines)
> +/**
> + * A symtab entry. When allocated this may be preceded by an annotation (see
> + * symbol__annotation), a browser_index (see symbol__browser_index) and rb_node
> + * to sort by name (see struct symbol_name_rb_node).
>   */
>  struct symbol {
>         struct rb_node  rb_node;
> +       /** Range of symbol [start, end). */
>         u64             start;
>         u64             end;
> +       /** Length of the string name. */
>         u16             namelen;
> +       /** ELF symbol type as defined for st_info. E.g STT_OBJECT or STT_FUNC. */
>         u8              type:4;
> +       /** ELF binding type as defined for st_info. E.g. STB_WEAK or STB_GLOBAL. */
>         u8              binding:4;
> +       /** Set true for kernel symbols of idle routines. */
>         u8              idle:1;
> +       /** Resolvable but tools ignore it (e.g. idle routines). */
>         u8              ignore:1;
> +       /** Symbol for an inlined function. */
>         u8              inlined:1;
> +       /** Architecture specific. Unused except on PPC where it holds st_other. */
>         u8              arch_sym;
> +       /** Has symbol__annotate2 been performed. */
>         bool            annotate2;
> +       /** The name of length namelen associated with the symbol. */
>         char            name[];
>  };
>
> --
> 2.34.0.rc1.387.gb447b232ab-goog
>