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Date: Thu, 6 Jul 2023 01:26:50 +0530
From: Anup Sharma <anupnewsmail@...il.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Anup Sharma <anupnewsmail@...il.com>,
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>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] scripts: python: Implement parsing of input data in
convertPerfScriptProfile
On Fri, Jun 23, 2023 at 05:03:12PM -0700, Namhyung Kim wrote:
> Hi Anup,
>
> On Wed, Jun 21, 2023 at 12:41 PM Anup Sharma <anupnewsmail@...il.com> wrote:
> >
> > The lines variable is created by splitting the profile string into individual
> > lines. It allows for iterating over each line for processing.
> >
> > The line is considered the start of a sample. It is matched against a regular
> > expression pattern to extract relevant information such as before_time_stamp,
> > time_stamp, threadNamePidAndTidMatch, threadName, pid, and tid.
> >
> > The stack frames of the current sample are then parsed in a nested loop.
> > Each stackFrameLine is matched against a regular expression pattern to
> > extract rawFunc and mod information.
> >
> > Also fixed few checkpatch warnings.
> >
> > Signed-off-by: Anup Sharma <anupnewsmail@...il.com>
> > ---
> > .../scripts/python/firefox-gecko-converter.py | 62 ++++++++++++++++++-
> > 1 file changed, 60 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
> > index 0ff70c0349c8..e5bc7a11c3e6 100644
> > --- a/tools/perf/scripts/python/firefox-gecko-converter.py
> > +++ b/tools/perf/scripts/python/firefox-gecko-converter.py
> > @@ -1,4 +1,5 @@
> > #!/usr/bin/env python3
> > +# SPDX-License-Identifier: GPL-2.0
>
> Please put this line in the first commit.
Sure, followed in latest version.
> > import re
> > import sys
> > import json
> > @@ -14,13 +15,13 @@ def isPerfScriptFormat(profile):
> > firstLine = profile[:profile.index('\n')]
> > return bool(re.match(r'^\S.*?\s+(?:\d+/)?\d+\s+(?:\d+\d+\s+)?[\d.]+:', firstLine))
> >
> > -def convertPerfScriptProfile(profile):
> > +def convertPerfScriptProfile(profile):
>
> You'd better configure your editor to warn or even fix
> the trailing whitespace automatically.
Thanks, I followed your advice and configured my nvim to handle trailing
whitespace automatically. It has significantly improved my workflow.
Here's the updated snippet I added to my vimrc file:
highlight ExtraWhitespace ctermbg=white guibg=white
match ExtraWhitespace /\s\+$/
> Thanks,
> Namhyung
>
>
> >
> > def addSample(threadName, stackArray, time):
> > nonlocal name
> > if name != threadName:
> > name = threadName
> > - # TODO:
> > + # TODO:
> > # get_or_create_stack will create a new stack if it doesn't exist, or return the existing stack if it does.
> > # get_or_create_frame will create a new frame if it doesn't exist, or return the existing frame if it does.
> > stack = reduce(lambda prefix, stackFrame: get_or_create_stack(get_or_create_frame(stackFrame), prefix), stackArray, None)
> > @@ -54,3 +55,60 @@ def convertPerfScriptProfile(profile):
> > thread = _createtread(threadName, pid, tid)
> > threadMap[tid] = thread
> > thread['addSample'](threadName, stack, time_stamp)
> > +
> > + lines = profile.split('\n')
> > +
> > + line_index = 0
> > + startTime = 0
> > + while line_index < len(lines):
> > + line = lines[line_index]
> > + line_index += 1
> > + # perf script --header outputs header lines beginning with #
> > + if line == '' or line.startswith('#'):
> > + continue
> > +
> > + sample_start_line = line
> > +
> > + sample_start_match = re.match(r'^(.*)\s+([\d.]+):', sample_start_line)
> > + if not sample_start_match:
> > + print(f'Could not parse line as the start of a sample in the "perf script" profile format: "{sample_start_line}"')
> > + continue
> > +
> > + before_time_stamp = sample_start_match[1]
> > + time_stamp = float(sample_start_match[2]) * 1000
> > + threadNamePidAndTidMatch = re.match(r'^(.*)\s+(?:(\d+)\/)?(\d+)\b', before_time_stamp)
> > +
> > + if not threadNamePidAndTidMatch:
> > + print('Could not parse line as the start of a sample in the "perf script" profile format: "%s"' % sampleStartLine)
> > + continue
> > + threadName = threadNamePidAndTidMatch[1].strip()
> > + pid = int(threadNamePidAndTidMatch[2] or 0)
> > + tid = int(threadNamePidAndTidMatch[3] or 0)
> > + if startTime == 0:
> > + startTime = time_stamp
> > + # Parse the stack frames of the current sample in a nested loop.
> > + stack = []
> > + while line_index < len(lines):
> > + stackFrameLine = lines[line_index]
> > + line_index += 1
> > + if stackFrameLine.strip() == '':
> > + # Sample ends.
> > + break
> > + stackFrameMatch = re.match(r'^\s*(\w+)\s*(.+) \(([^)]*)\)', stackFrameLine)
> > + if stackFrameMatch:
> > + rawFunc = stackFrameMatch[2]
> > + mod = stackFrameMatch[3]
> > + rawFunc = re.sub(r'\+0x[\da-f]+$', '', rawFunc)
> > +
> > + if rawFunc.startswith('('):
> > + continue # skip process names
> > +
> > + if mod:
> > + # If we have a module name, provide it.
> > + # The code processing the profile will search for
> > + # "functionName (in libraryName)" using a regexp,
> > + # and automatically create the library information.
> > + rawFunc += f' (in {mod})'
> > +
> > + stack.append(rawFunc)
> > +
> > --
> > 2.34.1
> >
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