linux-kernel - Re: [PATCH 3/3] perf tools: Fix buildid processing

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Date:	Wed, 19 Aug 2015 12:42:17 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	mingo@...nel.org
Subject: Re: [PATCH 3/3] perf tools: Fix buildid processing

Em Wed, Aug 19, 2015 at 06:23:51PM +0300, Adrian Hunter escreveu:
> On 19/08/2015 5:29 p.m., Adrian Hunter wrote:
> >After recording, 'perf record' post-processes the data to
> >determine which buildids are needed. That processing must
> >process the data in time order, if possible, because
> >otherwise dependent events, like forks and mmaps, will
> >not make sense.
> >
> >Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> >---
> >  tools/perf/builtin-record.c | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> >
> >diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> >index de165a1b9240..f36b88938499 100644
> >--- a/tools/perf/builtin-record.c
> >+++ b/tools/perf/builtin-record.c
> >@@ -500,6 +500,15 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
> >  		return -1;
> >  	}
> >
> >+	/*
> >+	 * Normally perf_session__new would do this, but it doesn't have the
> >+	 * evlist.
> >+	 */
> >+	if (rec->tool.ordered_events && !perf_evlist__sample_id_all(rec->evlist)) {
> >+		dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
> >+		rec->tool.ordered_events = false;
> >+	}
> >+
> 
> In fact this chunk is misplaced, it needs to be below the call to record__open()
> after which the attributes are correctly configured.  And dump_printf() is no good
> for 'perf record', pr_debug would be better. Don't have time to do that right now,
> I'll do it tommorow unless Arnaldo fixes it up.

I'll fix it up, thanks!

- Arnaldo
 
> >  	fd = perf_data_file__fd(file);
> >  	rec->session = session;
> >
> >@@ -965,9 +974,11 @@ static struct record record = {
> >  	.tool = {
> >  		.sample		= process_sample_event,
> >  		.fork		= perf_event__process_fork,
> >+		.exit		= perf_event__process_exit,
> >  		.comm		= perf_event__process_comm,
> >  		.mmap		= perf_event__process_mmap,
> >  		.mmap2		= perf_event__process_mmap2,
> >+		.ordered_events	= true,
> >  	},
> >  };
> >
> >
--
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