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Commit 520a2ebc authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf report: Add Instruction Tracing support 



Add support for decoding an AUX area assuming it contains instruction
tracing data.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1429903807-20559-4-git-send-email-adrian.hunter@intel.com


[ Do not use -Z as an alternative to --itrace ]
[ Fixed initialization of itrace_synth_opts struct fields on older gcc versions ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 6d5cdd64

tools/perf/Documentation/perf-report.txt

+27 −0
Original line number Diff line number Diff line
@@ -327,6 +327,33 @@ OPTIONS 


include::callchain-overhead-calculation.txt[]



--itrace::

	Options for decoding instruction tracing data. The options are:



		i	synthesize instructions events

		b	synthesize branches events

		c	synthesize branches events (calls only)

		r	synthesize branches events (returns only)

		e	synthesize error events

		d	create a debug log

		g	synthesize a call chain for instructions events



	The default is all events i.e. the same as --itrace=ibe



	In addition, the period (default 100000) for instructions events

	can be specified in units of:



		i	instructions

		t	ticks

		ms	milliseconds

		us	microseconds

		ns	nanoseconds (default)



	Also the call chain size (default 16, max. 1024) for instructions

	events can be specified.



	To disable decoding entirely, use --no-itrace.



SEE ALSO

--------

linkperf:perf-stat[1], linkperf:perf-annotate[1]

tools/perf/builtin-report.c

+11 −0
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ 
#include "util/data.h"

#include "arch/common.h"



#include "util/auxtrace.h"



#include <dlfcn.h>

#include <linux/bitmap.h>
@@ -585,6 +587,7 @@ parse_percent_limit(const struct option *opt, const char *str, 
int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)

{

	struct perf_session *session;

	struct itrace_synth_opts itrace_synth_opts = { .set = 0, };

	struct stat st;

	bool has_br_stack = false;

	int branch_mode = -1;
@@ -607,6 +610,9 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused) 
			.attr		 = perf_event__process_attr,

			.tracing_data	 = perf_event__process_tracing_data,

			.build_id	 = perf_event__process_build_id,

			.id_index	 = perf_event__process_id_index,

			.auxtrace_info	 = perf_event__process_auxtrace_info,

			.auxtrace	 = perf_event__process_auxtrace,

			.ordered_events	 = true,

			.ordering_requires_timestamps = true,

		},
@@ -717,6 +723,9 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused) 
		     "Don't show entries under that percent", parse_percent_limit),

	OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",

		     "how to display percentage of filtered entries", parse_filter_percentage),

	OPT_CALLBACK_OPTARG(0, "itrace", &itrace_synth_opts, NULL, "opts",

			    "Instruction Tracing options",

			    itrace_parse_synth_opts),

	OPT_END()

	};

	struct perf_data_file file = {
@@ -761,6 +770,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused) 
					       report.queue_size);

	}



	session->itrace_synth_opts = &itrace_synth_opts;



	report.session = session;



	has_br_stack = perf_header__has_feat(&session->header,