Added command line switches and UI (controlled via a build option)

to make it easier to use the sampling profiler.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/6250070

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@73374 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 100 insertions, 0 deletions

diff --git a/base/debug/profiler.cc b/base/debug/profiler.cc
new file mode 100644
index 0000000..8597dac
--- /dev/null
+++ b/base/debug/profiler.cc
@@ -0,0 +1,65 @@
+// Copyright (c) 2010 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.
+
+#include "base/debug/profiler.h"
+
+#include <string>
+
+#include "base/process_util.h"
+#include "base/string_util.h"
+
+#if defined(ENABLE_PROFILING) && !defined(NO_TCMALLOC)
+#include "third_party/tcmalloc/chromium/src/google/profiler.h"
+#endif
+
+namespace base {
+namespace debug {
+
+#if defined(ENABLE_PROFILING) && !defined(NO_TCMALLOC)
+
+static int profile_count = 0;
+
+void StartProfiling(const std::string& name) {
+  ++profile_count;
+  std::string full_name(name);
+  std::string pid = StringPrintf("%d", GetCurrentProcId());
+  std::string count = StringPrintf("%d", profile_count);
+  ReplaceSubstringsAfterOffset(&full_name, 0, "{pid}", pid);
+  ReplaceSubstringsAfterOffset(&full_name, 0, "{count}", count);
+  ProfilerStart(full_name.c_str());
+}
+
+void StopProfiling() {
+  ProfilerFlush();
+  ProfilerStop();
+}
+
+void FlushProfiling() {
+  ProfilerFlush();
+}
+
+bool BeingProfiled() {
+  return ProfilingIsEnabledForAllThreads();
+}
+
+#else
+
+void StartProfiling(const std::string& name) {
+}
+
+void StopProfiling() {
+}
+
+void FlushProfiling() {
+}
+
+bool BeingProfiled() {
+  return false;
+}
+
+#endif
+
+}  // namespace debug
+}  // namespace base
+
diff --git a/base/debug/profiler.h b/base/debug/profiler.h
new file mode 100644
index 0000000..e3044d6
--- /dev/null
+++ b/base/debug/profiler.h
@@ -0,0 +1,35 @@
+// Copyright (c) 2011 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.
+
+#ifndef BASE_DEBUG_PROFILER_H
+#define BASE_DEBUG_PROFILER_H
+#pragma once
+
+#include <string>
+
+// The Profiler functions allow usage of the underlying sampling based
+// profiler. If the application has not been built with the necessary
+// flags (-DENABLE_PROFILING and not -DNO_TCMALLOC) then these functions
+// are noops.
+namespace base {
+namespace debug {
+
+// Start profiling with the supplied name.
+// {pid} will be replaced by the process' pid and {count} will be replaced
+// by the count of the profile run (starts at 1 with each process).
+void StartProfiling(const std::string& name);
+
+// Stop profiling and write out data.
+void StopProfiling();
+
+// Force data to be written to file.
+void FlushProfiling();
+
+// Returns true if process is being profiled.
+bool BeingProfiled();
+
+}  // namespace debug
+}  // namespace base
+
+#endif  // BASE_DEBUG_DEBUGGER_H