linux-kernel - Re: [PATCH] perf inject: Set PERF_RECORD_MISC_BUILD_ID

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Date:   Mon, 21 Nov 2022 10:45:14 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf inject: Set PERF_RECORD_MISC_BUILD_ID_SIZE

On 19/11/22 02:27, Namhyung Kim wrote:
> With perf inject -b, it synthesizes build-id event for DSOs.  But it
> missed to set the size and resulted in having trailing zeros.
> 
> As perf record sets the size in write_build_id(), let's set the size
> here as well.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/util/synthetic-events.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
> index cccd293b5312..0645795ff080 100644
> --- a/tools/perf/util/synthetic-events.c
> +++ b/tools/perf/util/synthetic-events.c
> @@ -2218,8 +2218,9 @@ int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16
>  	len = pos->long_name_len + 1;
>  	len = PERF_ALIGN(len, NAME_ALIGN);
>  	memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
> +	ev.build_id.size = pos->bid.size;
>  	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
> -	ev.build_id.header.misc = misc;
> +	ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
>  	ev.build_id.pid = machine->pid;
>  	ev.build_id.header.size = sizeof(ev.build_id) + len;
>  	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);