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perf scripts python: Implement add sample function and thread processing

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The stack has been created for storing func and dso from the callchain.
The sample has been added to a specific thread. It first checks if the
thread exists in the Thread class. Then it call _add_sample function
which is responsible for appending a new entry to the samples list.

Also callchain parsing and storing part is implemented. Moreover removed
the comment from thread.

Signed-off-by: Anup Sharma <anupnewsmail@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/5a112be85ccdcdcd611e343f6a7a7482d01f6299.1689961706.git.anupnewsmail@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Anup Sharma 2023-07-21 23:26:24 +05:30 committed by Arnaldo Carvalho de Melo
parent 258dfd41c1
commit 2d889c6af1
1 changed files with 50 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
tools/perf/scripts/python/gecko.py
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@ -40,6 +40,9 @@ CATEGORIES = None
# The product name is used by the profiler UI to show the Operating system and Processor.
PRODUCT = os.popen('uname -op').read().strip()
# Here key = tid, value = Thread
tid_to_thread = dict()
# The category index is used by the profiler UI to show the color of the flame graph.
USER_CATEGORY_INDEX = 0
KERNEL_CATEGORY_INDEX = 1
@ -153,6 +156,25 @@ class Thread:
))
return frame_id
def _add_sample(self, comm: str, stack: List[str], time_ms: Milliseconds) -> None:
"""Add a timestamped stack trace sample to the thread builder.
Args:
comm: command-line (name) of the thread at this sample
stack: sampled stack frames. Root first, leaf last.
time_ms: timestamp of sample in milliseconds.
"""
# Ihreads may not set their names right after they are created.
# Instead, they might do it later. In such situations, to use the latest name they have set.
if self.comm != comm:
self.comm = comm
prefix_stack_id = reduce(lambda prefix_id, frame: self._intern_stack
(self._intern_frame(frame), prefix_id), stack, None)
if prefix_stack_id is not None:
self.samples.append(Sample(stack_id=prefix_stack_id,
time_ms=time_ms,
responsiveness=0))
def _to_json_dict(self) -> Dict:
"""Converts current Thread to GeckoThread JSON format."""
# Gecko profile format is row-oriented data as List[List],
@ -231,9 +253,36 @@ def process_event(param_dict: Dict) -> None:
if not start_time:
start_time = time_stamp
# Parse and append the callchain of the current sample into a stack.
stack = []
if param_dict['callchain']:
for call in param_dict['callchain']:
if 'sym' not in call:
continue
stack.append(f'{call["sym"]["name"]} (in {call["dso"]})')
if len(stack) != 0:
# Reverse the stack, as root come first and the leaf at the end.
stack = stack[::-1]
# During perf record if -g is not used, the callchain is not available.
# In that case, the symbol and dso are available in the event parameters.
else:
func = param_dict['symbol'] if 'symbol' in param_dict else '[unknown]'
dso = param_dict['dso'] if 'dso' in param_dict else '[unknown]'
stack.append(f'{func} (in {dso})')
# Add sample to the specific thread.
thread = tid_to_thread.get(tid)
if thread is None:
thread = Thread(comm=comm, pid=pid, tid=tid)
tid_to_thread[tid] = thread
thread._add_sample(comm=comm, stack=stack, time_ms=time_stamp)
# Trace_end runs at the end and will be used to aggregate
# the data into the final json object and print it out to stdout.
def trace_end() -> None:
threads = [thread._to_json_dict() for thread in tid_to_thread.values()]
# Schema: https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L305
gecko_profile_with_meta = {
"meta": {
@ -252,8 +301,7 @@ def trace_end() -> None:
"markerSchema": [],
},
"libs": [],
# threads will be implemented in later commits.
# "threads": threads,
"threads": threads,
"processes": [],
"pausedRanges": [],
}