Telemetry: integrates memory_measurement with TCMalloc dumps

tools/perf/perf_tools/memory_measurement.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 from perf_tools import histogram_metric
 from telemetry.page import page_measurement
 
 MEMORY_HISTOGRAMS = [
     {'name': 'V8.MemoryExternalFragmentationTotal', 'units': 'percent'},
     {'name': 'V8.MemoryHeapSampleTotalCommitted', 'units': 'kb'},
     {'name': 'V8.MemoryHeapSampleTotalUsed', 'units': 'kb'},
@@ skipping 25 matching lines @@
     # and no other pages. For this test, we need to disable histogram
     # customizing, so that we get the same generic histograms produced for all
     # pages.
     options.AppendExtraBrowserArg('--disable-histogram-customizer')
     options.AppendExtraBrowserArg('--memory-metrics')
     options.AppendExtraBrowserArg('--reduce-security-for-dom-automation-tests')
 
   def CanRunForPage(self, page):
     return hasattr(page, 'stress_memory')
 
   def MeasurePage(self, page, tab, results):

[Dai Mikurube (NOT FULLTIME), 2013/05/14 15:07:07]

Just a question.  When is is called?

[bulach, 2013/05/14 15:34:17]

afaict, this is called after all actions for a given page has been executed..

[Dai Mikurube (NOT FULLTIME), 2013/05/14 17:02:10]

Got it.  Thanks!

     for h in self.histograms:
       h.GetValue(page, tab, results)
+    dumps = eval(tab.EvaluateJavaScript("""
+      if (chrome && chrome.memoryBenchmarking &&
+          chrome.memoryBenchmarking.isHeapProfilerRunning()) {

[Dai Mikurube (NOT FULLTIME), 2013/05/14 15:07:07]

I'm not confident whether we should always dump when
chrome.memoryBenchmarking.isHeapProfilerRunning() is true, or not.  How about
when --profiler-tool=tcmalloc?

[bulach, 2013/05/14 15:34:17]

good idea! done.

+        JSON.stringify([
+            chrome.memoryBenchmarking.heapProfilerDump('renderer'),
+            chrome.memoryBenchmarking.heapProfilerDump('browser'),
+        ]);
+      } else {
+        JSON.stringify([]);
+      }
+    """))
+    if dumps:
+      print 'Memory dumps available at ', dumps