linux-kernel - Re: [PATCH 16/26] perf tools: Synthesize modules with mmap3

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Message-ID: <20200914160758.GK160517@kernel.org>
Date:   Mon, 14 Sep 2020 13:07:58 -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>,
        "Frank Ch. Eigler" <fche@...hat.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 16/26] perf tools: Synthesize modules with mmap3

Em Sun, Sep 13, 2020 at 11:03:03PM +0200, Jiri Olsa escreveu:
> Synthesizing modules with mmap3 events so we can
> get build id data for module's maps as well.

Ditto as for 15/26
 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/synthetic-events.c | 37 +++++++++++++++++++-----------
>  1 file changed, 24 insertions(+), 13 deletions(-)
> 
> diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
> index bd6e7b84283d..6bd2423ce2f3 100644
> --- a/tools/perf/util/synthetic-events.c
> +++ b/tools/perf/util/synthetic-events.c
> @@ -605,7 +605,7 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
>  	int rc = 0;
>  	struct map *pos;
>  	struct maps *maps = machine__kernel_maps(machine);
> -	union perf_event *event = zalloc((sizeof(event->mmap) +
> +	union perf_event *event = zalloc((sizeof(event->mmap3) +
>  					  machine->id_hdr_size));
>  	if (event == NULL) {
>  		pr_debug("Not enough memory synthesizing mmap event "
> @@ -613,8 +613,6 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
>  		return -1;
>  	}
>  
> -	event->header.type = PERF_RECORD_MMAP;
> -
>  	/*
>  	 * kernel uses 0 for user space maps, see kernel/perf_event.c
>  	 * __perf_event_mmap
> @@ -631,17 +629,30 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
>  			continue;
>  
>  		size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
> -		event->mmap.header.type = PERF_RECORD_MMAP;
> -		event->mmap.header.size = (sizeof(event->mmap) -
> -				        (sizeof(event->mmap.filename) - size));
> -		memset(event->mmap.filename + size, 0, machine->id_hdr_size);
> -		event->mmap.header.size += machine->id_hdr_size;
> -		event->mmap.start = pos->start;
> -		event->mmap.len   = pos->end - pos->start;
> -		event->mmap.pid   = machine->pid;
> -
> -		memcpy(event->mmap.filename, pos->dso->long_name,
> +		event->mmap3.header.type = PERF_RECORD_MMAP3;
> +		event->mmap3.header.size = (sizeof(event->mmap3) -
> +					   (sizeof(event->mmap3.filename) - size));
> +		memset(event->mmap3.filename + size, 0, machine->id_hdr_size);
> +		event->mmap3.header.size += machine->id_hdr_size;
> +		event->mmap3.start = pos->start;
> +		event->mmap3.len   = pos->end - pos->start;
> +		event->mmap3.pid   = machine->pid;
> +
> +		memcpy(event->mmap3.filename, pos->dso->long_name,
>  		       pos->dso->long_name_len + 1);
> +
> +		rc = filename__read_build_id(event->mmap3.filename, event->mmap3.buildid,
> +					     BUILD_ID_SIZE);
> +		if (rc != BUILD_ID_SIZE) {
> +			if (event->mmap3.filename[0] == '/') {
> +				pr_debug2("Failed to read build ID for %s\n",
> +					  event->mmap3.filename);
> +			}
> +			memset(event->mmap3.buildid, 0x0, sizeof(event->mmap3.buildid));
> +		}
> +
> +		rc = 0;
> +
>  		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
>  			rc = -1;
>  			break;
> -- 
> 2.26.2
> 

-- 

- Arnaldo