Commit ae938802 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf python: Support the PERF_RECORD_SWITCH event 

To test it check tools/perf/python/twatch.py, after following the
instructions there to enable context_switch, output looks like:

  [root@zoo linux]# tools/perf/python/twatch.py
  cpu: 1, pid: 31463, tid: 31463 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31463, switch_out: 0 }
  cpu: 2, pid: 31463, tid: 31496 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31496, switch_out: 0 }
  cpu: 2, pid: 31463, tid: 31496 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31496, switch_out: 1 }
  cpu: 3, pid: 31463, tid: 31527 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31527, switch_out: 0 }
  cpu: 1, pid: 31463, tid: 31463 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31463, switch_out: 1 }
  cpu: 3, pid: 31463, tid: 31527 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31527, switch_out: 1 }
  cpu: 1, pid: 31463, tid: 31463 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31463, switch_out: 0 }
  ^CTraceback (most recent call last):
    File "tools/perf/python/twatch.py", line 67, in <module>
      main(context_switch = 1, thread = 31463)
    File "tools/perf/python/twatch.py", line 40, in main
      evlist.poll(timeout = -1)
  KeyboardInterrupt
  [root@zoo linux]#

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Guy Streeter <streeter@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-1ukistmpamc5z717k80ctcp2@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 38349665

tools/perf/python/twatch.py

+20 −3
Original line number Diff line number Diff line
@@ -15,14 +15,14 @@ 


import perf



def main():

def main(context_switch = 0, thread = -1):

	cpus = perf.cpu_map()

	threads = perf.thread_map()

	threads = perf.thread_map(thread)

	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,

			   sample_id_all = 1,

			   sample_id_all = 1, context_switch = context_switch,

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



	"""What we want are just the PERF_RECORD_ lifetime events for threads,
@@ -48,4 +48,21 @@ def main(): 
			print event



if __name__ == '__main__':

    """

	To test the PERF_RECORD_SWITCH record, pick a pid and replace

	in the following line.



	Example output:



cpu: 3, pid: 31463, tid: 31593 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31593, switch_out: 1 }

cpu: 1, pid: 31463, tid: 31489 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31489, switch_out: 1 }

cpu: 2, pid: 31463, tid: 31496 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31496, switch_out: 1 }

cpu: 3, pid: 31463, tid: 31491 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31491, switch_out: 0 }



	It is possible as well to use event.misc & perf.PERF_RECORD_MISC_SWITCH_OUT

	to figure out if this is a context switch in or out of the monitored threads.



	If bored, please add command line option parsing support for these options :-)

    """

    # main(context_switch = 1, thread = 31463)

    main()

tools/perf/util/python.c

+55 −4
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ static char pyrf_mmap_event__doc[] = PyDoc_STR("perf mmap event object."); 
static PyMemberDef pyrf_mmap_event__members[] = {

	sample_members

	member_def(perf_event_header, type, T_UINT, "event type"),

	member_def(perf_event_header, misc, T_UINT, "event misc"),

	member_def(mmap_event, pid, T_UINT, "event pid"),

	member_def(mmap_event, tid, T_UINT, "event tid"),

	member_def(mmap_event, start, T_ULONGLONG, "start of the map"),
@@ -297,6 +298,43 @@ static PyTypeObject pyrf_sample_event__type = { 
	.tp_repr	= (reprfunc)pyrf_sample_event__repr,

};



static char pyrf_context_switch_event__doc[] = PyDoc_STR("perf context_switch event object.");



static PyMemberDef pyrf_context_switch_event__members[] = {

	sample_members

	member_def(perf_event_header, type, T_UINT, "event type"),

	member_def(context_switch_event, next_prev_pid, T_UINT, "next/prev pid"),

	member_def(context_switch_event, next_prev_tid, T_UINT, "next/prev tid"),

	{ .name = NULL, },

};



static PyObject *pyrf_context_switch_event__repr(struct pyrf_event *pevent)

{

	PyObject *ret;

	char *s;



	if (asprintf(&s, "{ type: context_switch, next_prev_pid: %u, next_prev_tid: %u, switch_out: %u }",

		     pevent->event.context_switch.next_prev_pid,

		     pevent->event.context_switch.next_prev_tid,

		     !!(pevent->event.header.misc & PERF_RECORD_MISC_SWITCH_OUT)) < 0) {

		ret = PyErr_NoMemory();

	} else {

		ret = PyString_FromString(s);

		free(s);

	}

	return ret;

}



static PyTypeObject pyrf_context_switch_event__type = {

	PyVarObject_HEAD_INIT(NULL, 0)

	.tp_name	= "perf.context_switch_event",

	.tp_basicsize	= sizeof(struct pyrf_event),

	.tp_flags	= Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,

	.tp_doc		= pyrf_context_switch_event__doc,

	.tp_members	= pyrf_context_switch_event__members,

	.tp_repr	= (reprfunc)pyrf_context_switch_event__repr,

};



static int pyrf_event__setup_types(void)

{

	int err;
@@ -306,6 +344,7 @@ static int pyrf_event__setup_types(void) 
	pyrf_lost_event__type.tp_new =

	pyrf_read_event__type.tp_new =

	pyrf_sample_event__type.tp_new =

	pyrf_context_switch_event__type.tp_new =

	pyrf_throttle_event__type.tp_new = PyType_GenericNew;

	err = PyType_Ready(&pyrf_mmap_event__type);

	if (err < 0)
@@ -328,6 +367,9 @@ static int pyrf_event__setup_types(void) 
	err = PyType_Ready(&pyrf_sample_event__type);

	if (err < 0)

		goto out;

	err = PyType_Ready(&pyrf_context_switch_event__type);

	if (err < 0)

		goto out;

out:

	return err;

}
@@ -342,6 +384,8 @@ static PyTypeObject *pyrf_event__type[] = { 
	[PERF_RECORD_FORK]	 = &pyrf_task_event__type,

	[PERF_RECORD_READ]	 = &pyrf_read_event__type,

	[PERF_RECORD_SAMPLE]	 = &pyrf_sample_event__type,

	[PERF_RECORD_SWITCH]	 = &pyrf_context_switch_event__type,

	[PERF_RECORD_SWITCH_CPU_WIDE]  = &pyrf_context_switch_event__type,

};



static PyObject *pyrf_event__new(union perf_event *event)
@@ -349,8 +393,10 @@ static PyObject *pyrf_event__new(union perf_event *event) 
	struct pyrf_event *pevent;

	PyTypeObject *ptype;



	if (event->header.type < PERF_RECORD_MMAP ||

	    event->header.type > PERF_RECORD_SAMPLE)

	if ((event->header.type < PERF_RECORD_MMAP ||

	     event->header.type > PERF_RECORD_SAMPLE) &&

	    !(event->header.type == PERF_RECORD_SWITCH ||

	      event->header.type == PERF_RECORD_SWITCH_CPU_WIDE))

		return NULL;



	ptype = pyrf_event__type[event->header.type];
@@ -528,6 +574,7 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel, 
		"exclude_hv",

		"exclude_idle",

		"mmap",

		"context_switch",

		"comm",

		"freq",

		"inherit_stat",
@@ -553,6 +600,7 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel, 
	    exclude_hv = 0,

	    exclude_idle = 0,

	    mmap = 0,

	    context_switch = 0,

	    comm = 0,

	    freq = 1,

	    inherit_stat = 0,
@@ -565,13 +613,13 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel, 
	int idx = 0;



	if (!PyArg_ParseTupleAndKeywords(args, kwargs,

					 "|iKiKKiiiiiiiiiiiiiiiiiiiiiKK", kwlist,

					 "|iKiKKiiiiiiiiiiiiiiiiiiiiiiKK", kwlist,

					 &attr.type, &attr.config, &attr.sample_freq,

					 &sample_period, &attr.sample_type,

					 &attr.read_format, &disabled, &inherit,

					 &pinned, &exclusive, &exclude_user,

					 &exclude_kernel, &exclude_hv, &exclude_idle,

					 &mmap, &comm, &freq, &inherit_stat,

					 &mmap, &context_switch, &comm, &freq, &inherit_stat,

					 &enable_on_exec, &task, &watermark,

					 &precise_ip, &mmap_data, &sample_id_all,

					 &attr.wakeup_events, &attr.bp_type,
@@ -595,6 +643,7 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel, 
	attr.exclude_hv	    = exclude_hv;

	attr.exclude_idle   = exclude_idle;

	attr.mmap	    = mmap;

	attr.context_switch = context_switch;

	attr.comm	    = comm;

	attr.freq	    = freq;

	attr.inherit_stat   = inherit_stat;
@@ -1019,6 +1068,8 @@ static struct { 
	PERF_CONST(RECORD_LOST_SAMPLES),

	PERF_CONST(RECORD_SWITCH),

	PERF_CONST(RECORD_SWITCH_CPU_WIDE),



	PERF_CONST(RECORD_MISC_SWITCH_OUT),

	{ .name = NULL, },

};

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