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authorArnaldo Carvalho de Melo <acme@redhat.com>2015-10-06 17:46:46 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-10-07 19:41:50 -0300
commitae938802443732e77d01f8d5b52b900b9327ff30 (patch)
tree67ee10943f425619e70850628c5f164aa0e13dc2 /tools/perf/python/twatch.py
parent38349665388fb079fb2bc8c46db9446dd976802a (diff)
downloadlinux-ae938802443732e77d01f8d5b52b900b9327ff30.tar.gz
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>
Diffstat (limited to 'tools/perf/python/twatch.py')
-rwxr-xr-xtools/perf/python/twatch.py23
1 files changed, 20 insertions, 3 deletions
diff --git a/tools/perf/python/twatch.py b/tools/perf/python/twatch.py
index b9d508336ae6..c235c22b107a 100755
--- a/tools/perf/python/twatch.py
+++ b/tools/perf/python/twatch.py
@@ -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()