The Tor Browser: tools/profiler/merge-profiles.py@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 #!/usr/bin/env python

2 #

     3 # This script takes b2g process profiles and merged them into a single profile.

     4 # The meta data is taken from the first profile. The startTime for each profile

     5 # is used to syncronized the samples. Each thread is moved into the merged

     6 # profile.

7 #

     8 import json

     9 import re

    10 import sys

    12 def MergeProfiles(files):

    13     threads = []

    14     fileData = []

    15     symTable = dict()

    16     meta = None

    17     libs = None

    18     minStartTime = None

    20     for fname in files:

    21         match = re.match('profile_([0-9]+)_(.+)\.sym', fname)

    22         if match is None:

    23             raise Exception("Filename '" + fname + "' doesn't match expected pattern")

    24         pid = match.groups(0)[0]

    25         pname = match.groups(0)[1]

    27         fp = open(fname, "r")

    28         fileData = json.load(fp)

    29         fp.close()

    31         if meta is None:

    32             meta = fileData['profileJSON']['meta'].copy()

    33             libs = fileData['profileJSON']['libs']

    34             minStartTime = meta['startTime']

    35         else:

    36             minStartTime = min(minStartTime, fileData['profileJSON']['meta']['startTime'])

    37             meta['startTime'] = minStartTime

    39         for thread in fileData['profileJSON']['threads']:

    40             thread['name'] = thread['name'] + " (" + pname + ":" + pid + ")"

    41             threads.append(thread)

    43             # Note that pid + sym, pid + location could be ambigious

    44             # if we had pid=11 sym=1 && pid=1 sym=11.

    45             pidStr = pid + ":"

    47             thread['startTime'] = fileData['profileJSON']['meta']['startTime']

    48             samples = thread['samples']

    49             for sample in thread['samples']:

    50                 for frame in sample['frames']:

    51                     if "location" in frame and frame['location'][0:2] == '0x':

    52                         oldLoc = frame['location']

    53                         newLoc = pidStr + oldLoc

    54                         frame['location'] = newLoc

    55                         # Default to the unprefixed symbol if no translation is available

    56                         symTable[newLoc] = oldLoc

    58         filesyms = fileData['symbolicationTable']

    59         for sym in filesyms.keys():

    60             symTable[pidStr + sym] = filesyms[sym]

    62     # For each thread, make the time offsets line up based on the

    63     # earliest start

    64     for thread in threads:

    65         delta = thread['startTime'] - minStartTime

    66         for sample in thread['samples']:

    67             if "time" in sample:

    68                 sample['time'] += delta

    70     result = dict()

    71     result['profileJSON'] = dict()

    72     result['profileJSON']['meta'] = meta

    73     result['profileJSON']['libs'] = libs

    74     result['profileJSON']['threads'] = threads

    75     result['symbolicationTable'] = symTable

    76     result['format'] = "profileJSONWithSymbolicationTable,1"

    78     json.dump(result, sys.stdout)

    81 if len(sys.argv) > 1:

    82     MergeProfiles(sys.argv[1:])

    83     sys.exit(0)

    85 print "Usage: merge-profile.py profile_<pid1>_<pname1>.sym profile_<pid2>_<pname2>.sym > merged.sym"

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