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Commit 41d279aa authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Merge tag 'perf-core-for-mingo' of... 

Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux

 into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

User visible changes:

  - Force period term to overload global settings, i.e. previously this
    command line:

     $ perf record -e 'cpu/instructions,period=20000/',cycles -c 1000 sleep 1

    would result in both events having a period equal to 1000, with the fix we
    get something saner:

     $ perf evlist -v | grep period
     cpu/instructions,period=20000/: ... { sample_period, sample_freq }: 20000, ...
     cycles: ... { sample_period, sample_freq }: 1000 ...
     $

   (Jiri Olsa)

Infrastructure changes:

  - Use the dummy software event with freq=0 in the twatch.py python
    binding example, to avoid disabling nohz. (Arnaldo Carvalho de Melo)

  - Add some missing constants to the python binding. (Arnaldo Carvalho de Melo)

  - Fix mismatched declarations for elf_getphdrnum, that happens
    only in the corner case where this function is not found on
    the system.  (Arnaldo Carvalho de Melo)

  - Add build test for having ending double slash. (Jiri Olsa)

  - Introduce callgraph_set for callgraph option. (Kan Liang)

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parents acd632eb aa53c09e

tools/perf/Documentation/perf-record.txt

+1 −1
Original line number Original line Diff line number Diff line
@@ -46,7 +46,7 @@ OPTIONS 
          /sys/bus/event_sources/devices/<pmu>/format/*

          /sys/bus/event_sources/devices/<pmu>/format/*





	  There are also some params which are not defined in .../<pmu>/format/*.

	  There are also some params which are not defined in .../<pmu>/format/*.

	  These params can be used to set event defaults.

	  These params can be used to overload default config values per event.

	  Here is a list of the params.

	  Here is a list of the params.

	  - 'period': Set event sampling period

	  - 'period': Set event sampling period

tools/perf/builtin-record.c

+7 −2
Original line number Original line Diff line number Diff line
@@ -762,12 +762,14 @@ static void callchain_debug(void) 
			 callchain_param.dump_size);

			 callchain_param.dump_size);

}

}





int record_parse_callchain_opt(const struct option *opt __maybe_unused,

int record_parse_callchain_opt(const struct option *opt,

			       const char *arg,

			       const char *arg,

			       int unset)

			       int unset)

{

{

	int ret;

	int ret;

	struct record_opts *record = (struct record_opts *)opt->value;





	record->callgraph_set = true;

	callchain_param.enabled = !unset;

	callchain_param.enabled = !unset;





	/* --no-call-graph */

	/* --no-call-graph */
@@ -784,10 +786,13 @@ int record_parse_callchain_opt(const struct option *opt __maybe_unused, 
	return ret;

	return ret;

}

}





int record_callchain_opt(const struct option *opt __maybe_unused,

int record_callchain_opt(const struct option *opt,

			 const char *arg __maybe_unused,

			 const char *arg __maybe_unused,

			 int unset __maybe_unused)

			 int unset __maybe_unused)

{

{

	struct record_opts *record = (struct record_opts *)opt->value;



	record->callgraph_set = true;

	callchain_param.enabled = true;

	callchain_param.enabled = true;





	if (callchain_param.record_mode == CALLCHAIN_NONE)

	if (callchain_param.record_mode == CALLCHAIN_NONE)

tools/perf/builtin-trace.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -1489,7 +1489,7 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist) 
	if (trace->host == NULL)

	if (trace->host == NULL)

		return -ENOMEM;

		return -ENOMEM;





	if (trace_event__register_resolver(trace->host) < 0)

	if (trace_event__register_resolver(trace->host, machine__resolve_kernel_addr) < 0)

		return -errno;

		return -errno;





	err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,

	err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,

tools/perf/perf.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -52,6 +52,7 @@ struct record_opts { 
	bool	     sample_weight;

	bool	     sample_weight;

	bool	     sample_time;

	bool	     sample_time;

	bool	     sample_time_set;

	bool	     sample_time_set;

	bool	     callgraph_set;

	bool	     period;

	bool	     period;

	bool	     sample_intr_regs;

	bool	     sample_intr_regs;

	bool	     running_time;

	bool	     running_time;

tools/perf/python/twatch.py

+11 −1
Original line number Original line Diff line number Diff line
@@ -18,10 +18,20 @@ import perf 
def main():

def main():

	cpus = perf.cpu_map()

	cpus = perf.cpu_map()

	threads = perf.thread_map()

	threads = perf.thread_map()

	evsel = perf.evsel(task = 1, comm = 1, mmap = 0,

	evsel = perf.evsel(type	  = perf.TYPE_SOFTWARE,

			   config = perf.COUNT_SW_DUMMY,

			   task = 1, comm = 1, mmap = 0, freq = 0,

			   wakeup_events = 1, watermark = 1,

			   wakeup_events = 1, watermark = 1,

			   sample_id_all = 1,

			   sample_id_all = 1,

			   sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU)

			   sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU)



	"""What we want are just the PERF_RECORD_ lifetime events for threads,

	 using the default, PERF_TYPE_HARDWARE + PERF_COUNT_HW_CYCLES & freq=1

	 (the default), makes perf reenable irq_vectors:local_timer_entry, when

	 disabling nohz, not good for some use cases where all we want is to get

	 threads comes and goes... So use (perf.TYPE_SOFTWARE, perf_COUNT_SW_DUMMY,

	 freq=0) instead."""



	evsel.open(cpus = cpus, threads = threads);

	evsel.open(cpus = cpus, threads = threads);

	evlist = perf.evlist(cpus, threads)

	evlist = perf.evlist(cpus, threads)

	evlist.add(evsel)

	evlist.add(evsel)