linux-kernel - Re: [PATCH 23/24] perf buildid-list: Add support for mmap2's buildid events

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Date:   Tue, 17 Nov 2020 09:50:40 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 23/24] perf buildid-list: Add support for mmap2's buildid
 events

Em Tue, Nov 17, 2020 at 12:00:52PM +0100, Jiri Olsa escreveu:
> Add buildid-list support for mmap2's build id data, so we can
> display build ids for dso objects for data without the build
> id cache update.

>   $ perf buildid-list
>   1805c738c8f3ec0f47b7ea09080c28f34d18a82b /usr/lib64/ld-2.31.so
>   d278249792061c6b74d1693ca59513be1def13f2 /usr/lib64/libc-2.31.so
> 
> By default only dso objects with hits are shown.

Would be interesting to be able to show all the build ids that are
there. a 'perf buildid-list --all' or make this under --force?

- Arnaldo
 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/builtin-buildid-list.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
> index e3ef75583514..87f5b1a4a7fa 100644
> --- a/tools/perf/builtin-buildid-list.c
> +++ b/tools/perf/builtin-buildid-list.c
> @@ -77,6 +77,9 @@ static int perf_session__list_build_ids(bool force, bool with_hits)
>  	    perf_header__has_feat(&session->header, HEADER_AUXTRACE))
>  		with_hits = false;
>  
> +	if (!perf_header__has_feat(&session->header, HEADER_BUILD_ID))
> +		with_hits = true;
> +
>  	/*
>  	 * in pipe-mode, the only way to get the buildids is to parse
>  	 * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
> -- 
> 2.26.2
> 

-- 

- Arnaldo