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Date: Wed, 12 Jul 2023 10:25:50 -0700
From: Ian Rogers <irogers@...gle.com>
To: Anup Sharma <anupnewsmail@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/6] scripts: python: thread sample processing to
create thread with schemas
On Mon, Jul 10, 2023 at 4:13 PM Anup Sharma <anupnewsmail@...il.com> wrote:
>
> The _addThreadSample function is responsible for adding a sample
> to a specific thread. It first checks if the thread exists in
> the thread_map dictionary.
>
> The markers structure defines the schema and data for
> thread markers, including fields such as 'name',
> 'startTime', 'endTime', 'phase', 'category', and 'data'.
>
> The samples structure defines the schema and data for thread
> samples, including fields such as 'stack', 'time', and
> 'responsiveness'.
>
> The frameTable structure defines the schema and data for frame
> information, including fields such as 'location', 'relevantForJS',
> 'innerWindowID', 'implementation', 'optimizations', 'line',
> 'column', 'category', and 'subcategory'.
>
> The purpose of this function is to create a new thread structure
> These structures provide a framework for storing and organizing
> information related to thread markers, samples, frame details,
> and stack information.
>
> The call stack is parsed to include function names and the associated
> DSO, which are requires for creating json schema. Also few libaries
> has been included which will be used in later commit.
nit: s/requires/required.
nit: I think the "Also few..." statement is out-of-date.
> Signed-off-by: Anup Sharma <anupnewsmail@...il.com>
> ---
> .../scripts/python/firefox-gecko-converter.py | 70 +++++++++++++++++++
> 1 file changed, 70 insertions(+)
>
> diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
> index 765f1775cee5..0b8a86bdcab1 100644
> --- a/tools/perf/scripts/python/firefox-gecko-converter.py
> +++ b/tools/perf/scripts/python/firefox-gecko-converter.py
> @@ -21,6 +21,7 @@ sys.path.append(os.environ['PERF_EXEC_PATH'] + \
> from perf_trace_context import *
> from Core import *
>
A comment and type information would be useful here. map is another
word for a dictionary, which is somewhat implied. So the information
here is that this data structure will hold something to do with
threads. Perhaps say, "a map from TID to a Thread." A better variable
name may then be tid_to_thread_map, but as map is implied you could
do: tid_to_thread: Dict[int, Thread].
> +thread_map = {}
> start_time = None
>
> def trace_end():
> @@ -28,6 +29,57 @@ def trace_end():
>
> def process_event(param_dict):
> global start_time
> + global thread_map
> +
> + def _createThread(name, pid, tid):
> + markers = {
> + 'schema': {
> + 'name': 0,
> + 'startTime': 1,
> + 'endTime': 2,
> + 'phase': 3,
> + 'category': 4,
> + 'data': 5,
> + },
> + 'data': [],
> + }
> + samples = {
> + 'schema': {
> + 'stack': 0,
> + 'time': 1,
> + 'responsiveness': 2,
> + },
> + 'data': [],
> + }
> + frameTable = {
> + 'schema': {
> + 'location': 0,
> + 'relevantForJS': 1,
> + 'innerWindowID': 2,
> + 'implementation': 3,
> + 'optimizations': 4,
> + 'line': 5,
> + 'column': 6,
> + 'category': 7,
> + 'subcategory': 8,
> + },
> + 'data': [],
> + }
> + stackTable = {
> + 'schema': {
> + 'prefix': 0,
> + 'frame': 1,
> + },
> + 'data': [],
> + }
> + stringTable = []
Is there a missing return here?
> +
> + def _addThreadSample(pid, tid, threadName, time_stamp, stack):
> + thread = thread_map.get(tid)
> + if not thread:
> + thread = _createThread(threadName, pid, tid)
> + thread_map[tid] = thread
> +
> # Extract relevant information from the event parameters. The event parameters
> # are in a dictionary:
> time_stamp = (param_dict['sample']['time'] // 1000) / 1000
> @@ -37,3 +89,21 @@ def process_event(param_dict):
>
> # Assume that start time is the time of the first event.
> start_time = time_stamp if not start_time else start_time
> +
> + # Parse the callchain of the current sample into a stack array.
> + if param_dict['callchain']:
> + stack = []
> + for call in param_dict['callchain']:
> + if 'sym' not in call:
> + continue
> + stack.append(call['sym']['name'] + f' (in {call["dso"]})')
Rather than mix an append and an f-string, just have the f-string ie:
stack.append(f'{call["sym"]["name"]} (in {"call["dso"]})')
> + if len(stack) != 0:
> + stack = stack[::-1]
> + _addThreadSample(pid, tid, thread_name, time_stamp, stack)
> +
> + # 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]'
> + _addThreadSample(pid, tid, thread_name, time_stamp, [func + f' (in {dso})'])
Similarly:
f'{func} (in {dso})'
Thanks,
Ian
> --
> 2.34.1
>
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