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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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-10-06 17:46:46 -03:00
parent 3834966538
commit ae93880244
2 changed files with 75 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
tools/perf/python/twatch.py
View File

@ -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()

59
tools/perf/util/python.c
View File

@ -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, },
};