adb_profile_chrome: Check in perf-to-tracing conversion script

tools/profile_chrome/third_party/perf_to_tracing.py

Index: tools/profile_chrome/third_party/perf_to_tracing.py
diff --git a/tools/profile_chrome/third_party/perf_to_tracing.py b/tools/profile_chrome/third_party/perf_to_tracing.py
new file mode 100644
index 0000000000000000000000000000000000000000..280937a8f49b85322138931ad035bb7aebf44fea
--- /dev/null
+++ b/tools/profile_chrome/third_party/perf_to_tracing.py
@@ -0,0 +1,248 @@
+# Script for converting perf script events into tracing JSON.
+#
+# Generated by perf script -g python
+# Licensed under the terms of the GNU GPL License version 2
+
+import json
+import os
+import sys
+
+from collections import deque
+
+
+# Categorize DSOs by component.
+dso_to_comp = {
+    'libdvm.so': 'Java',
+    'libart.so': 'Java',
+    'libjavacore.so': 'Java',
+    'libandroid_runtime.so': 'Android',
+    'libgui.so': 'Android',
+    'libui.so': 'Android',
+    'libbinder.so': 'Android',
+    'libmemalloc.so': 'Android',
+    'libcrypto.so': 'Android',
+    'libcutils.so':'Android',
+    'libutils.so': 'Android',
+    '[kernel.kallsyms]': 'Kernel',
+    'libc.so': 'Standard Lib',
+    'libstdc++.so': 'Standard Lib',
+    'libm.so':'Standard Lib',
+    'libGLESv2_adreno.so': 'GPU Driver',
+    'libGLESv2_adreno200.so': 'GPU Driver',
+    'libq3dtools_adreno200.so': 'GPU Driver',
+    'libEGL_adreno.so': 'GPU Driver',
+    'libEGL_adreno200.so': 'GPU Driver',
+    'libEGL.so': 'GPU Driver',
+    'libgsl.so': 'GPU Driver',
+    'libGLESv2.so': 'GPU Driver',
+    'libsc-a3xx.so': 'GPU Driver',
+    'libadreno_utils.so': 'GPU Driver',
+    'eglsubAndroid.so': 'GPU Driver',
+    'gralloc.msm8960.so': 'GPU Driver',
+    'libadreno_utils': 'GPU Driver',
+    'libGLES_mali.so': 'GPU Driver',
+    'libchromeview.so': 'Chrome',
+    '[unknown]': '<unknown>',
+    '[UNKNOWN]': '<unknown>',
+}
+
+
+def FilterSymbolModule(module):
+  m = dso_to_comp.get(module, None)
+  if m:
+    return m
+  if module.find('libchrome.') == 0:
+    return 'Chrome'
+  if module.find('dalvik') >= 0 or module.find('@') >= 0:
+    return 'Java'
+  return module
+
+
+def FilterSymbolName(module, orign_module, name):
+  if module == 'Java':
+    return name
+  elif module == 'GPU Driver':
+    return name
+  if name == '':
+    return orign_module + ':unknown'
+  if name[0].isdigit() or name == '(nil)':
+    return orign_module + ':unknown'
+  return name
+
+
+class StackFrameNode:
+  def __init__(self, stack_id, name, category):
+    self.stack_id = stack_id
+    self.parent_id = 0
+    self.children = {}
+    self.category = category
+    self.name = name
+    self.samples = []
+    self.total_weight = 0.0
+    self.have_total_weight = False
+    self.parent = None
+
+  def ToDict(self, out_dict):
+    if self.stack_id:
+      node_dict = {}
+      node_dict['name'] = self.name
+      node_dict['category'] = self.category
+      if self.parent_id:
+        node_dict['parent'] = self.parent_id
+
+      out_dict[self.stack_id] = node_dict
+
+    for child in self.children.values():
+      child.ToDict(out_dict)
+    return out_dict
+
+  def GetTotalWeight(self):
+    if self.have_total_weight:
+      return self.total_weight
+    else:
+      # Sum up self samples weight, and children's total weights.
+      for s in self.samples:
+        self.total_weight += s.weight
+      for c in self.children.values():
+        self.total_weight += c.GetTotalWeight()
+      self.have_total_weight = True
+      return self.total_weight
+
+
+class PerfSample:
+  def __init__(self, stack_id, ts, cpu, tid, weight, samp_type, comm):
+    self.stack_id = stack_id
+    self.ts = ts
+    self.cpu = cpu
+    self.tid = tid
+    self.weight = weight
+    self.type = samp_type
+    self.comm = comm
+
+  def ToDict(self):
+    ret = {}
+    ret['ts'] = self.ts / 1000.0  # Timestamp in microseconds
+    ret['tid'] = self.tid  # Thread id
+    ret['cpu'] = self.cpu  # Sampled CPU
+    ret['weight'] = self.weight  # Sample weight
+    ret['name'] = self.type  # Sample type
+    ret['comm'] = self.comm  # Sample type
+    assert self.stack_id != 0
+    if self.stack_id:
+      ret['sf'] = self.stack_id  # Stack frame id
+    return ret
+
+
+samples = []
+root_chain = StackFrameNode(0, 'root', '[unknown]')
+next_stack_id = 1
+tot_period = 0
+saved_period = 0
+
+
+def process_event(param_dict):
+  global next_stack_id
+  global saved_period
+  global tot_period
+
+  samp_comm = param_dict['comm']
+  samp_tid = param_dict['tid']
+  samp_cpu = param_dict['cpu']
+  samp_ts = param_dict['time']
+  samp_period = param_dict['period']
+  samp_type = param_dict['ev_name']
+  tot_period += samp_period
+
+  # Parse call chain.
+  seen_syms = set()
+  chain = deque()
+  for cs in param_dict['cs']:
+    cs_name = cs[0]
+    cs_dso = os.path.basename(cs[1])
+    cs_category = FilterSymbolModule(cs_dso)
+    cs_name = FilterSymbolName(cs_category, cs_dso, cs_name)
+
+    if cs_category != '<unknown>' or len(chain) == 0:
+      sym = (cs_name, cs_category)
+      if sym in seen_syms:
+        while chain[0] != sym:
+          seen_syms.remove(chain[0])
+          chain.popleft()
+      else:
+        seen_syms.add(sym)
+        chain.appendleft(sym)
+
+      # Discard garbage stacktrace before __pthread_start()
+      if cs_name == '__pthread_start(void*)':
+        break
+
+  # Done reading call chain.  Add to stack frame tree.
+  stack_frame = root_chain
+  for call in chain:
+    if call in stack_frame.children:
+      stack_frame = stack_frame.children[call]
+    else:
+      new_node = StackFrameNode(next_stack_id, call[0], call[1])
+      next_stack_id += 1
+      new_node.parent_id = stack_frame.stack_id
+      stack_frame.children[call] = new_node
+      stack_frame = new_node
+
+  # Save sample.
+  sample = PerfSample(stack_frame.stack_id,
+                  samp_ts,
+                  samp_cpu,
+                  samp_tid,
+                  samp_period,
+                  samp_type,
+                  samp_comm)
+  samples.append(sample)
+  stack_frame.samples.append(sample)
+  saved_period += samp_period
+
+
+def trace_begin():
+  pass
+
+
+def trace_end():
+  # Return siblings of a call tree node.
+  def GetNodeSiblings(node):
+    if not node:
+      return []
+    if not node.parent:
+      return []
+    return node.parent.children.values()
+
+  # Try to reduce misplaced stack leaves by moving them up into sibling nodes.
+  def FixCallTree(node, parent):
+    # Get siblings of node's parent.
+    node.parent = parent
+    parent_siblings = GetNodeSiblings(parent)
+
+    # If parent's sibling has same node name, has no children and small weight,
+    # transplant sibling's samples into the current node.
+    for sibling in parent_siblings:
+      if sibling.name == node.name and \
+          len(sibling.children) == 0 and \
+          sibling.GetTotalWeight() <= node.GetTotalWeight() * 0.15:
+
+        # Transplant samples from sibling to current node.
+        for samp in sibling.samples:
+          samp.stack_id = node.stack_id
+          node.samples.append(samp)
+        sibling.samples = []
+        break
+
+    # Recurse child nodes.
+    for c in node.children.values():
+      FixCallTree(c, node)
+
+  FixCallTree(root_chain, None)
+
+  trace_dict = {}
+  trace_dict['samples'] = [s.ToDict() for s in samples]
+  trace_dict['stackFrames'] = root_chain.ToDict({})
+  trace_dict['traceEvents'] = []
+
+  json.dump(trace_dict, sys.stdout, indent=1)