tools/profiler/merge-profiles.py

   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
  11
  12 def MergeProfiles(files):
  13     threads = []
  14     fileData = []
  15     symTable = dict()
  16     meta = None
  17     libs = None
  18     videoUrl = None
  19     minStartTime = None
  20
  21     for fname in files:
  22         if fname.startswith("--video="):
  23             videoUrl = fname[8:]
  24             continue
  25
  26         match = re.match('profile_([0-9]+)_(.+)\.sym', fname)
  27         if match is None:
  28             raise Exception("Filename '" + fname + "' doesn't match expected pattern")
  29         pid = match.groups(0)[0]
  30         pname = match.groups(0)[1]
  31
  32         fp = open(fname, "r")
  33         fileData = json.load(fp)
  34         fp.close()
  35
  36         if meta is None:
  37             meta = fileData['profileJSON']['meta'].copy()
  38             libs = fileData['profileJSON']['libs']
  39             minStartTime = meta['startTime']
  40         else:
  41             minStartTime = min(minStartTime, fileData['profileJSON']['meta']['startTime'])
  42             meta['startTime'] = minStartTime
  43
  44         for thread in fileData['profileJSON']['threads']:
  45             thread['name'] = thread['name'] + " (" + pname + ":" + pid + ")"
  46             threads.append(thread)
  47
  48             # Note that pid + sym, pid + location could be ambigious
  49             # if we had pid=11 sym=1 && pid=1 sym=11.
  50             pidStr = pid + ":"
  51
  52             thread['startTime'] = fileData['profileJSON']['meta']['startTime']
  53             samples = thread['samples']
  54             for sample in thread['samples']:
  55                 for frame in sample['frames']:
  56                     if "location" in frame and frame['location'][0:2] == '0x':
  57                         oldLoc = frame['location']
  58                         newLoc = pidStr + oldLoc
  59                         frame['location'] = newLoc
  60                         # Default to the unprefixed symbol if no translation is available
  61                         symTable[newLoc] = oldLoc
  62
  63         filesyms = fileData['symbolicationTable']
  64         for sym in filesyms.keys():
  65             symTable[pidStr + sym] = filesyms[sym]
  66
  67     # For each thread, make the time offsets line up based on the
  68     # earliest start
  69     for thread in threads:
  70         delta = thread['startTime'] - minStartTime
  71         for sample in thread['samples']:
  72             if "time" in sample:
  73                 sample['time'] += delta
  74         for marker in thread['markers']:
  75             marker['time'] += delta
  76
  77     result = dict()
  78     result['profileJSON'] = dict()
  79     result['profileJSON']['meta'] = meta
  80     result['profileJSON']['libs'] = libs
  81     result['profileJSON']['threads'] = threads
  82     result['symbolicationTable'] = symTable
  83     result['format'] = "profileJSONWithSymbolicationTable,1"
  84     if videoUrl:
  85         result['profileJSON']['meta']['videoCapture'] = {"src": videoUrl}
  86
  87     json.dump(result, sys.stdout)
  88
  89
  90 if len(sys.argv) > 1:
  91     MergeProfiles(sys.argv[1:])
  92     sys.exit(0)
  93
  94 print "Usage: merge-profile.py profile_<pid1>_<pname1>.sym profile_<pid2>_<pname2>.sym > merged.sym"
  95
  96
  97