Mac: Implement about:memory.

This implements about:memory on Mac. It calls /bin/ps to obtain information
about processes (this is Apple's officially supported "API"). Unfortunately, ps
provides fairly minimal information (rss and vsize); top is better, but not a
stable API -- it has changed greatly between Mac OS 10.5 and 10.6, and moreover
the 10.6 version is more limited in its output formatting.

BUG=9653
TEST=Go to about:memory under a variety of conditions (with a variety of browsers loaded).

Review URL: http://codereview.chromium.org/333008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31168 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 1198 insertions, 27 deletions

diff --git a/chrome/browser/browser_resources.grd b/chrome/browser/browser_resources.grd
index 134adae..3a5ce14 100644
--- a/chrome/browser/browser_resources.grd
+++ b/chrome/browser/browser_resources.grd
@@ -17,8 +17,10 @@ without changes to the corresponding grd file. ek -->
       <if expr="os == 'linux2'">
         <include name="IDR_ABOUT_MEMORY_HTML" file="resources\about_memory_linux.html" flattenhtml="true" type="BINDATA" />
       </if>
-
-      <if expr="os != 'linux2'">
+      <if expr="os == 'darwin'">
+        <include name="IDR_ABOUT_MEMORY_HTML" file="resources\about_memory_mac.html" flattenhtml="true" type="BINDATA" />
+      </if>
+      <if expr="os != 'linux2' and os != 'darwin'">
         <include name="IDR_ABOUT_MEMORY_HTML" file="resources\about_memory.html" flattenhtml="true" type="BINDATA" />
       </if>
 
diff --git a/chrome/browser/memory_details.cc b/chrome/browser/memory_details.cc
index 4ea4444..9953442a 100644
--- a/chrome/browser/memory_details.cc
+++ b/chrome/browser/memory_details.cc
@@ -184,31 +184,34 @@ void MemoryDetails::UpdateHistograms() {
     int sample = static_cast<int>(browser.processes[index].working_set.priv);
     aggregate_memory += sample;
     switch (browser.processes[index].type) {
-     case ChildProcessInfo::BROWSER_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB("Memory.Browser", sample);
-       break;
-     case ChildProcessInfo::RENDER_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB("Memory.Renderer", sample);
-       break;
-     case ChildProcessInfo::PLUGIN_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB("Memory.Plugin", sample);
-       plugin_count++;
-       break;
-     case ChildProcessInfo::WORKER_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB("Memory.Worker", sample);
-       worker_count++;
-       break;
-     case ChildProcessInfo::ZYGOTE_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB("Memory.Zygote", sample);
-       break;
-     case ChildProcessInfo::SANDBOX_HELPER_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB("Memory.SandboxHelper", sample);
-       break;
-     case ChildProcessInfo::NACL_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB("Memory.NativeClient", sample);
-       break;
-     default:
-       NOTREACHED();
+      case ChildProcessInfo::BROWSER_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.Browser", sample);
+        break;
+      case ChildProcessInfo::RENDER_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.Renderer", sample);
+        break;
+      case ChildProcessInfo::PLUGIN_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.Plugin", sample);
+        plugin_count++;
+        break;
+      case ChildProcessInfo::WORKER_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.Worker", sample);
+        worker_count++;
+        break;
+      case ChildProcessInfo::UTILITY_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.Utility", sample);
+        break;
+      case ChildProcessInfo::ZYGOTE_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.Zygote", sample);
+        break;
+      case ChildProcessInfo::SANDBOX_HELPER_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.SandboxHelper", sample);
+        break;
+      case ChildProcessInfo::NACL_PROCESS:
+        UMA_HISTOGRAM_MEMORY_KB("Memory.NativeClient", sample);
+        break;
+      default:
+        NOTREACHED();
     }
   }
   UMA_HISTOGRAM_MEMORY_KB("Memory.BackingStore",
@@ -218,6 +221,8 @@ void MemoryDetails::UpdateHistograms() {
       static_cast<int>(browser.processes.size()));
   UMA_HISTOGRAM_COUNTS_100("Memory.PluginProcessCount", plugin_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.WorkerProcessCount", worker_count);
+  // TODO(viettrungluu): Do we want separate counts for the other
+  // (platform-specific) process types?
 
   int total_sample = static_cast<int>(aggregate_memory / 1000);
   UMA_HISTOGRAM_MEMORY_MB("Memory.Total", total_sample);
diff --git a/chrome/browser/memory_details.h b/chrome/browser/memory_details.h
index b92fbae..0b35b4e 100644
--- a/chrome/browser/memory_details.h
+++ b/chrome/browser/memory_details.h
@@ -52,6 +52,10 @@ struct ProcessData {
   ProcessMemoryInformationList processes;
 };
 
+#if defined(OS_MACOSX)
+class ProcessInfoSnapshot;
+#endif
+
 // MemoryDetails fetches memory details about current running browsers.
 // Because this data can only be fetched asynchronously, callers use
 // this class via a callback.
@@ -103,6 +107,16 @@ class MemoryDetails : public base::RefCountedThreadSafe<MemoryDetails> {
   // The parameter holds information about processes from the IO thread.
   void CollectProcessData(std::vector<ProcessMemoryInformation>);
 
+#if defined(OS_MACOSX)
+  // A helper for |CollectProcessData()|, collecting data on the Chrome/Chromium
+  // process with PID |pid|. The collected data is added to the state of the
+  // object (in |process_data_|).
+  void CollectProcessDataChrome(
+      const std::vector<ProcessMemoryInformation>& child_info,
+      base::ProcessId pid,
+      const ProcessInfoSnapshot& process_info);
+#endif
+
   // Collect child process information on the UI thread.  Information about
   // renderer processes is only available there.
   void CollectChildInfoOnUIThread();
diff --git a/chrome/browser/memory_details_mac.cc b/chrome/browser/memory_details_mac.cc
new file mode 100644
index 0000000..577a809
--- /dev/null
+++ b/chrome/browser/memory_details_mac.cc
@@ -0,0 +1,226 @@
+// Copyright (c) 2009 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 "chrome/browser/memory_details.h"
+
+#include <set>
+#include <string>
+
+#include "app/l10n_util.h"
+#include "base/basictypes.h"
+#include "base/file_path.h"
+#include "base/file_version_info.h"
+#include "base/mac_util.h"
+#include "base/string_util.h"
+#include "base/process_util.h"
+#include "base/thread.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/process_info_snapshot.h"
+#include "chrome/browser/renderer_host/backing_store_manager.h"
+#include "chrome/browser/renderer_host/render_process_host.h"
+#include "chrome/browser/tab_contents/navigation_entry.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/common/child_process_host.h"
+#include "chrome/common/chrome_constants.h"
+#include "chrome/common/url_constants.h"
+#include "grit/chromium_strings.h"
+
+// TODO(viettrungluu): Many of the TODOs below are subsumed by a general need to
+// refactor the about:memory code (not just on Mac, but probably on other
+// platforms as well). I've filed crbug.com/25456.
+
+class RenderViewHostDelegate;
+
+// Known browsers which we collect details for. |CHROME_BROWSER| *must* be the
+// first browser listed. The order here must match those in |process_template|
+// (in |MemoryDetails::MemoryDetails()| below).
+// TODO(viettrungluu): In the big refactoring (see above), get rid of this order
+// dependence.
+enum BrowserType {
+  // TODO(viettrungluu): possibly add more?
+  CHROME_BROWSER = 0,
+  SAFARI_BROWSER,
+  FIREFOX_BROWSER,
+  CAMINO_BROWSER,
+  OPERA_BROWSER,
+  OMNIWEB_BROWSER,
+  MAX_BROWSERS
+} BrowserProcess;
+
+
+MemoryDetails::MemoryDetails() {
+  static const std::wstring google_browser_name =
+      l10n_util::GetString(IDS_PRODUCT_NAME);
+  // (Human and process) names of browsers; should match the ordering for
+  // |BrowserProcess| (i.e., |BrowserType|).
+  // TODO(viettrungluu): The current setup means that we can't detect both
+  // Chrome and Chromium at the same time!
+  // TODO(viettrungluu): Get localized browser names for other browsers
+  // (crbug.com/25779).
+  ProcessData process_template[MAX_BROWSERS] = {
+    { google_browser_name.c_str(), chrome::kBrowserProcessExecutableName, },
+    { L"Safari", L"Safari", },
+    { L"Firefox", L"firefox-bin", },
+    { L"Camino", L"Camino", },
+    { L"Opera", L"Opera", },
+    { L"OmniWeb", L"OmniWeb", },
+  };
+
+  for (size_t index = 0; index < arraysize(process_template); ++index) {
+    ProcessData process;
+    process.name = process_template[index].name;
+    process.process_name = process_template[index].process_name;
+    process_data_.push_back(process);
+  }
+}
+
+ProcessData* MemoryDetails::ChromeBrowser() {
+  return &process_data_[CHROME_BROWSER];
+}
+
+void MemoryDetails::CollectProcessData(
+    std::vector<ProcessMemoryInformation> child_info) {
+  // This must be run on the file thread to avoid jank (|ProcessInfoSnapshot|
+  // runs /bin/ps, which isn't instantaneous).
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::FILE));
+
+  // Clear old data.
+  for (size_t index = 0; index < MAX_BROWSERS; index++)
+    process_data_[index].processes.clear();
+
+  // First, we use |NamedProcessIterator| to get the PIDs of the processes we're
+  // interested in; we save our results to avoid extra calls to
+  // |NamedProcessIterator| (for performance reasons) and to avoid additional
+  // inconsistencies caused by racing. Then we run |/bin/ps| *once* to get
+  // information on those PIDs. Then we used our saved information to iterate
+  // over browsers, then over PIDs.
+
+  // Get PIDs of main browser processes.
+  std::vector<base::ProcessId> pids_by_browser[MAX_BROWSERS];
+  std::vector<base::ProcessId> all_pids;
+  for (size_t index = CHROME_BROWSER; index < MAX_BROWSERS; index++) {
+    base::NamedProcessIterator process_it(process_data_[index].process_name,
+                                          NULL);
+
+    while (const ProcessEntry* process_entry = process_it.NextProcessEntry()) {
+      pids_by_browser[index].push_back(process_entry->pid);
+      all_pids.push_back(process_entry->pid);
+    }
+  }
+
+  // Get PIDs of helpers.
+  std::vector<base::ProcessId> helper_pids;
+  {
+    base::NamedProcessIterator helper_it(chrome::kHelperProcessExecutableName,
+                                         NULL);
+    while (const ProcessEntry* process_entry = helper_it.NextProcessEntry()) {
+      helper_pids.push_back(process_entry->pid);
+      all_pids.push_back(process_entry->pid);
+    }
+  }
+
+  // Capture information about the processes we're interested in.
+  ProcessInfoSnapshot process_info;
+  process_info.Sample(all_pids);
+
+  // Handle the other processes first.
+  for (size_t index = CHROME_BROWSER + 1; index < MAX_BROWSERS; index++) {
+    for (std::vector<base::ProcessId>::const_iterator it =
+         pids_by_browser[index].begin();
+         it != pids_by_browser[index].end(); ++it) {
+      ProcessMemoryInformation info;
+      info.pid = *it;
+      info.type = ChildProcessInfo::UNKNOWN_PROCESS;
+
+      // Try to get version information. To do this, we need first to get the
+      // executable's name (we can only believe |proc_info.command| if it looks
+      // like an absolute path). Then we need strip the executable's name back
+      // to the bundle's name. And only then can we try to get the version.
+      scoped_ptr<FileVersionInfo> version_info;
+      ProcessInfoSnapshot::ProcInfoEntry proc_info;
+      if (process_info.GetProcInfo(info.pid, &proc_info)) {
+        if (proc_info.command.length() > 1 && proc_info.command[0] == '/') {
+          FilePath bundle_name =
+              mac_util::GetAppBundlePath(FilePath(proc_info.command));
+          if (!bundle_name.empty()) {
+            version_info.reset(FileVersionInfo::CreateFileVersionInfo(
+                bundle_name));
+          }
+        }
+      }
+      if (version_info.get()) {
+        info.product_name = version_info->product_name();
+        info.version = version_info->product_version();
+      } else {
+        info.product_name = process_data_[index].name;
+        info.version = L"";
+      }
+
+      // Memory info.
+      process_info.GetCommittedKBytesOfPID(info.pid, &info.committed);
+      process_info.GetWorkingSetKBytesOfPID(info.pid, &info.working_set);
+
+      // Add the process info to our list.
+      process_data_[index].processes.push_back(info);
+    }
+  }
+
+  // Collect data about Chrome/Chromium.
+  for (std::vector<base::ProcessId>::const_iterator it =
+       pids_by_browser[CHROME_BROWSER].begin();
+       it != pids_by_browser[CHROME_BROWSER].end(); ++it) {
+    CollectProcessDataChrome(child_info, *it, process_info);
+  }
+
+  // And collect data about the helpers.
+  for (std::vector<base::ProcessId>::const_iterator it = helper_pids.begin();
+       it != helper_pids.end(); ++it) {
+    CollectProcessDataChrome(child_info, *it, process_info);
+  }
+
+  // Finally return to the browser thread.
+  ChromeThread::PostTask(
+      ChromeThread::UI, FROM_HERE,
+      NewRunnableMethod(this, &MemoryDetails::CollectChildInfoOnUIThread));
+}
+
+void MemoryDetails::CollectProcessDataChrome(
+    const std::vector<ProcessMemoryInformation>& child_info,
+    base::ProcessId pid,
+    const ProcessInfoSnapshot& process_info) {
+  ProcessMemoryInformation info;
+  info.pid = pid;
+  if (info.pid == base::GetCurrentProcId())
+    info.type = ChildProcessInfo::BROWSER_PROCESS;
+  else
+    info.type = ChildProcessInfo::UNKNOWN_PROCESS;
+
+  scoped_ptr<FileVersionInfo> version_info(
+      FileVersionInfo::CreateFileVersionInfoForCurrentModule());
+  if (version_info.get()) {
+    info.product_name = version_info->product_name();
+    info.version = version_info->product_version();
+  } else {
+    info.product_name = process_data_[CHROME_BROWSER].name;
+    info.version = L"";
+  }
+
+  // Check if this is one of the child processes whose data we collected
+  // on the IO thread, and if so copy over that data.
+  for (size_t child = 0; child < child_info.size(); child++) {
+    if (child_info[child].pid == info.pid) {
+      info.titles = child_info[child].titles;
+      info.type = child_info[child].type;
+      break;
+    }
+  }
+
+  // Memory info.
+  process_info.GetCommittedKBytesOfPID(info.pid, &info.committed);
+  process_info.GetWorkingSetKBytesOfPID(info.pid, &info.working_set);
+
+  // Add the process info to our list.
+  process_data_[CHROME_BROWSER].processes.push_back(info);
+}
diff --git a/chrome/browser/process_info_snapshot.h b/chrome/browser/process_info_snapshot.h
new file mode 100644
index 0000000..88064c6
--- /dev/null
+++ b/chrome/browser/process_info_snapshot.h
@@ -0,0 +1,106 @@
+// Copyright (c) 2009 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 CHROME_BROWSER_PROCESS_INFO_SNAPSHOT_H_
+#define CHROME_BROWSER_PROCESS_INFO_SNAPSHOT_H_
+
+#include <sys/types.h>
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/process_util.h"
+
+// A class which captures process information at a given point in time when its
+// |Sample()| method is called. This information can then be probed by PID.
+// |Sample()| may take a while to complete, so if calling from the browser
+// process, only do so from the file thread. The current implementation, only on
+// Mac, pulls information from /bin/ps. /usr/bin/top provides much more
+// information about memory, but it has changed greatly from Mac OS 10.5.x to
+// 10.6.x, thereby raising future compatibility concerns. Moreover, the 10.6.x
+// version is less capable in terms of configuring output and its output is
+// harder to parse.
+// TODO(viettrungluu): This is currently only implemented and used on Mac, so
+// things are very Mac-specific. If this is ever implemented for other
+// platforms, we should subclass and add opaqueness (probably |ProcInfoEntry|
+// should be considered opaque).
+class ProcessInfoSnapshot {
+ public:
+  ProcessInfoSnapshot();
+  ~ProcessInfoSnapshot();
+
+  // Capture a snapshot of process memory information (by running ps) for the
+  // given list of PIDs. Call only from the file thread.
+  //   |pid_list| - list of |ProcessId|s on which to capture information.
+  //   returns - |true| if okay, |false| on error.
+  bool Sample(std::vector<base::ProcessId> pid_list);
+
+  // Reset all statistics (deallocating any memory allocated).
+  void Reset();
+
+  // Our basic structure for storing information about a process (the names are
+  // mostly self-explanatory). Note that |command| may not actually reflect the
+  // actual executable name; never trust it absolutely, and only take it
+  // half-seriously when it begins with '/'.
+  struct ProcInfoEntry {
+    base::ProcessId pid;
+    base::ProcessId ppid;
+    uid_t uid;
+    uid_t euid;
+    size_t rss;
+    size_t vsize;
+    std::string command;
+  };
+
+  // Get process information for a given PID.
+  //   |pid| - self-explanatory.
+  //   |proc_info| - place to put the process information.
+  //   returns - |true| if okay, |false| on error (including PID not found).
+  bool GetProcInfo(int pid,
+                   ProcInfoEntry* proc_info) const;
+
+  // Fills a |CommittedKBytes| with both resident and paged memory usage, as per
+  // its definition (or as close as we can manage). In the current (Mac)
+  // implementation, we map:
+  //                              vsize --> comm_priv,
+  //                                  0 --> comm_mapped,
+  //                                  0 --> comm_image;
+  //   in about:memory: virtual:private  =  comm_priv,
+  //                     virtual:mapped  =  comm_mapped.
+  // TODO(viettrungluu): Doing such a mapping is kind of ugly.
+  //   |pid| - self-explanatory.
+  //   |usage| - pointer to |CommittedBytes| to fill; zero-ed on error.
+  //   returns - |true| on success, |false| on error (including PID not found).
+  bool GetCommittedKBytesOfPID(int pid,
+                               base::CommittedKBytes* usage) const;
+
+  // Fills a |WorkingSetKBytes| containing resident private and shared memory,
+  // as per its definition (or as close as we can manage). In the current (Mac)
+  // implementation, we map:
+  //                              0 --> ws_priv,
+  //                            rss --> ws_shareable,
+  //                              0 --> ws_shared;
+  //   in about:memory: res:private  =  ws_priv + ws_shareable - ws_shared,
+  //                     res:shared  =  ws_shared / num_procs,
+  //                      res:total  =  res:private + res:shared.
+  // TODO(viettrungluu): Doing such a mapping is kind of ugly.
+  //   |pid| - self-explanatory.
+  //   |ws_usage| - pointer to |WorkingSetKBytes| to fill; zero-ed on error.
+  //   returns - |true| on success, |false| on error (including PID not found).
+  bool GetWorkingSetKBytesOfPID(int pid,
+                                base::WorkingSetKBytes* ws_usage) const;
+
+  // TODO(viettrungluu): Maybe we should also have the following (again, for
+  // "compatibility"):
+  //    size_t GetWorkingSetSizeOfPID(int pid) const;
+  //    size_t GetPeakWorkingSetSizeOfPID(int pid) const;
+  //    size_t GetPrivateBytesOfPID(int pid) const;
+
+ private:
+  // map from |int| (PID) to |ProcInfoEntry|
+  std::map<int,ProcInfoEntry> proc_info_entries_;
+};
+
+#endif  // CHROME_BROWSER_PROCESS_INFO_SNAPSHOT_H_
diff --git a/chrome/browser/process_info_snapshot_mac.cc b/chrome/browser/process_info_snapshot_mac.cc
new file mode 100644
index 0000000..c594e75
--- /dev/null
+++ b/chrome/browser/process_info_snapshot_mac.cc
@@ -0,0 +1,156 @@
+// Copyright (c) 2009 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 "chrome/browser/process_info_snapshot.h"
+
+#include <iostream>
+#include <sstream>
+
+#include "base/string_util.h"
+#include "base/thread.h"
+
+// Implementation for the Mac; calls '/bin/ps' for information when
+// |Sample()| is called.
+
+// Default constructor.
+ProcessInfoSnapshot::ProcessInfoSnapshot() { }
+
+// Destructor: just call |Reset()| to release everything.
+ProcessInfoSnapshot::~ProcessInfoSnapshot() {
+  Reset();
+}
+
+// Capture the information by calling '/bin/ps'.
+// Note: we ignore the "tsiz" (text size) display option of ps because it's
+// always zero (tested on 10.5 and 10.6).
+bool ProcessInfoSnapshot::Sample(std::vector<base::ProcessId> pid_list) {
+  Reset();
+
+  std::vector<std::string> argv;
+  argv.push_back("/bin/ps");
+  // Get PID, PPID, (real) UID, effective UID, resident set size, virtual memory
+  // size, and command.
+  argv.push_back("-o");
+  argv.push_back("pid=,ppid=,ruid=,uid=,rss=,vsz=,comm=");
+  // Only display the specified PIDs.
+  for(std::vector<base::ProcessId>::iterator it = pid_list.begin();
+      it != pid_list.end(); ++it) {
+    argv.push_back("-p");
+    argv.push_back(Int64ToString(static_cast<int64>(*it)));
+  }
+
+  std::string output;
+  CommandLine command_line(argv);
+  if (!base::GetAppOutputRestricted(command_line,
+                                    &output, (pid_list.size() + 10) * 100)) {
+    LOG(ERROR) << "Failure running /bin/ps to acquire data.";
+    return false;
+  }
+
+  std::istringstream in(output, std::istringstream::in);
+  std::string line;
+
+  // Process lines until done.
+  while (true) {
+    ProcInfoEntry proc_info;
+
+    // The format is as specified above to ps (see ps(1)):
+    //   "-o pid=,ppid=,ruid=,uid=,rss=,vsz=,comm=".
+    // Try to read the PID; if we get it, we should be able to get the rest of
+    // the line.
+    in >> proc_info.pid;
+    if (in.eof())
+      break;
+    in >> proc_info.ppid;
+    in >> proc_info.uid;
+    in >> proc_info.euid;
+    in >> proc_info.rss;
+    in >> proc_info.vsize;
+    in.ignore(1, ' ');                    // Eat the space.
+    std::getline(in, proc_info.command);  // Get the rest of the line.
+    if (!in.good()) {
+      LOG(ERROR) << "Error parsing output from /usr/bin/top.";
+      return false;
+    }
+
+    // Make sure the new PID isn't already in our list.
+    if (proc_info_entries_.find(proc_info.pid) != proc_info_entries_.end()) {
+      LOG(ERROR) << "Duplicate PID in output from /bin/ps.";
+      return false;
+    }
+
+    if (!proc_info.pid || ! proc_info.vsize) {
+      LOG(WARNING) << "Invalid data from /bin/ps.";
+      return false;
+    }
+
+    // Record the process information.
+    proc_info_entries_[proc_info.pid] = proc_info;
+  }
+
+  return true;
+}
+
+// Clear all the stored information.
+void ProcessInfoSnapshot::Reset() {
+  proc_info_entries_.clear();
+}
+
+bool ProcessInfoSnapshot::GetProcInfo(int pid,
+                                      ProcInfoEntry* proc_info) const {
+  std::map<int,ProcInfoEntry>::const_iterator it = proc_info_entries_.find(pid);
+  if (it == proc_info_entries_.end())
+    return false;
+
+  *proc_info = it->second;
+  return true;
+}
+
+bool ProcessInfoSnapshot::GetCommittedKBytesOfPID(
+    int pid,
+    base::CommittedKBytes* usage) const {
+  // Try to avoid crashing on a bug; stats aren't usually so crucial.
+  if (!usage) {
+    NOTREACHED();
+    return false;
+  }
+
+  // Failure of |GetProcInfo()| is "normal", due to racing.
+  ProcInfoEntry proc_info;
+  if (!GetProcInfo(pid, &proc_info)) {
+    usage->priv = 0;
+    usage->mapped = 0;
+    usage->image = 0;
+    return false;
+  }
+
+  usage->priv = proc_info.vsize;
+  usage->mapped = 0;
+  usage->image = 0;
+  return true;
+}
+
+bool ProcessInfoSnapshot::GetWorkingSetKBytesOfPID(
+    int pid,
+    base::WorkingSetKBytes* ws_usage) const {
+  // Try to avoid crashing on a bug; stats aren't usually so crucial.
+  if (!ws_usage) {
+    NOTREACHED();
+    return false;
+  }
+
+  // Failure of |GetProcInfo()| is "normal", due to racing.
+  ProcInfoEntry proc_info;
+  if (!GetProcInfo(pid, &proc_info)) {
+    ws_usage->priv = 0;
+    ws_usage->shareable = 0;
+    ws_usage->shared = 0;
+    return false;
+  }
+
+  ws_usage->priv = 0;
+  ws_usage->shareable = proc_info.rss;
+  ws_usage->shared = 0;
+  return true;
+}
diff --git a/chrome/browser/process_info_snapshot_mac_unittest.cc b/chrome/browser/process_info_snapshot_mac_unittest.cc
new file mode 100644
index 0000000..babdf27
--- /dev/null
+++ b/chrome/browser/process_info_snapshot_mac_unittest.cc
@@ -0,0 +1,85 @@
+// Copyright (c) 2009 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 "chrome/browser/process_info_snapshot.h"
+
+#include <sys/types.h>  // For |uid_t| (and |pid_t|).
+#include <unistd.h>  // For |getpid()|, |getuid()|, etc.
+
+#include <vector>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+typedef testing::Test ProcessInfoSnapshotMacTest;
+
+TEST_F(ProcessInfoSnapshotMacTest, FindPidOneTest) {
+  // Sample process with PID 1, which should exist and presumably belong to
+  // root.
+  std::vector<base::ProcessId> pid_list;
+  pid_list.push_back(1);
+  ProcessInfoSnapshot snapshot;
+  ASSERT_TRUE(snapshot.Sample(pid_list));
+
+  ProcessInfoSnapshot::ProcInfoEntry proc_info;
+  ASSERT_TRUE(snapshot.GetProcInfo(1, &proc_info));
+  EXPECT_EQ(1, static_cast<int64>(proc_info.pid));
+  EXPECT_EQ(0, static_cast<int64>(proc_info.ppid));
+  EXPECT_EQ(0, static_cast<int64>(proc_info.uid));
+  EXPECT_EQ(0, static_cast<int64>(proc_info.euid));
+  EXPECT_GE(proc_info.rss, 0u);
+  EXPECT_GT(proc_info.vsize, 0u);
+
+  // Try out the |Get...OfPID()|, but don't examine the results, since they
+  // depend on how we map |ProcInfoEntry| to |...KBytes|.
+  base::CommittedKBytes usage;
+  EXPECT_TRUE(snapshot.GetCommittedKBytesOfPID(1, &usage));
+  base::WorkingSetKBytes ws_usage;
+  EXPECT_TRUE(snapshot.GetWorkingSetKBytesOfPID(1, &ws_usage));
+
+  // Make sure it hasn't picked up some other PID (say, 2).
+  EXPECT_FALSE(snapshot.GetProcInfo(2, &proc_info));
+
+  // Make sure PID 2 still isn't there (in case I mess up my use of std::map).
+  EXPECT_FALSE(snapshot.GetProcInfo(2, &proc_info));
+
+  // Test |Reset()|.
+  snapshot.Reset();
+  EXPECT_FALSE(snapshot.GetProcInfo(1, &proc_info));
+}
+
+TEST_F(ProcessInfoSnapshotMacTest, FindPidSelfTest) {
+  // Sample this process and its parent.
+  base::ProcessId pid = static_cast<base::ProcessId>(getpid());
+  base::ProcessId ppid = static_cast<base::ProcessId>(getppid());
+  uid_t uid = getuid();
+  uid_t euid = geteuid();
+  EXPECT_NE(static_cast<int64>(ppid), 0);
+
+  std::vector<base::ProcessId> pid_list;
+  pid_list.push_back(pid);
+  pid_list.push_back(ppid);
+  ProcessInfoSnapshot snapshot;
+  ASSERT_TRUE(snapshot.Sample(pid_list));
+
+  // Find our process.
+  ProcessInfoSnapshot::ProcInfoEntry proc_info;
+  ASSERT_TRUE(snapshot.GetProcInfo(pid, &proc_info));
+  EXPECT_EQ(pid, proc_info.pid);
+  EXPECT_EQ(ppid, proc_info.ppid);
+  EXPECT_EQ(uid, proc_info.uid);
+  EXPECT_EQ(euid, proc_info.euid);
+  EXPECT_GE(proc_info.rss, 100u);     // Sanity check: we're running, so we
+                                      // should occupy at least 100 kilobytes.
+  EXPECT_GE(proc_info.vsize, 1024u);  // Sanity check: our |vsize| is presumably
+                                      // at least a megabyte.
+
+  // Find our parent.
+  ASSERT_TRUE(snapshot.GetProcInfo(ppid, &proc_info));
+  EXPECT_EQ(ppid, proc_info.pid);
+  EXPECT_NE(static_cast<int64>(proc_info.ppid), 0);
+  EXPECT_EQ(uid, proc_info.uid);    // This (and the following) should be true
+  EXPECT_EQ(euid, proc_info.euid);  // under reasonable circumstances.
+  // Can't say anything definite about its |rss|.
+  EXPECT_GT(proc_info.vsize, 0u);   // Its |vsize| should be nonzero though.
+}
diff --git a/chrome/browser/resources/about_memory_mac.html b/chrome/browser/resources/about_memory_mac.html
new file mode 100644
index 0000000..9b6d223
--- /dev/null
+++ b/chrome/browser/resources/about_memory_mac.html
@@ -0,0 +1,577 @@
+<!DOCTYPE HTML>
+
+<!--
+about:memory template page
+-->
+<html id="t">
+  <head>
+    <title>About Memory</title>
+
+<style>
+body {
+  font-size: 84%;
+  font-family: Helvetica, sans-serif;
+  padding: 0.75em;
+  margin: 0;
+  min-width: 45em;
+}
+
+h1 {
+  font-size: 110%;
+  font-weight: bold;
+  color: #4a8ee6;
+  letter-spacing: -1px;
+  padding: 0;
+  margin: 0;
+}
+h2 {
+  font-size: 110%;
+  letter-spacing: -1px;
+  font-weight: normal;
+  color: #4a8ee6;
+  padding: 0;
+  margin: 0;
+  padding: 0.5em 1em;
+  color: #3a75bd;
+  margin-left: -38px;
+  padding-left: 38px;
+
+  border-top: 1px solid #3a75bd;
+  padding-top: 0.5em;
+
+}
+h2:first-child {
+  border-top: 0;
+  padding-top: 0;
+}
+span.th {
+  padding-left: 0.35em;
+}
+a {
+  color: black;
+}
+
+div#header {
+  padding: 0.75em 1em;
+  padding-top: 0.6em;
+  padding-left: 0;
+  margin-bottom: 0.75em;
+  position: relative;
+  overflow: hidden;
+  background: #5296de;
+  -webkit-background-size: 100%;
+  border: 1px solid #3a75bd;
+  -webkit-border-radius: 6px;
+  color: white;
+  text-shadow: 0 0 2px black;
+}
+div#header h1 {
+  padding-left: 37px;
+  margin: 0;
+  display: inline;
+  background: url('gear.png') 12px 60% no-repeat;
+  color: white;
+}
+div#header p {
+  font-size: 84%;
+  font-style: italic;
+  padding: 0;
+  margin: 0;
+  color: white;
+  padding-left: 0.4em;
+  display: inline;
+}
+div#header div.navigation {
+  position: absolute;
+  top: 0;
+  right: 1em;
+  line-height: 3.5em;
+  font-size: 92%;
+}
+div#header select {
+  font-size: 100%;
+  font-family: Helvetica, sans-serif;
+  border: 1px solid #3a75bd;
+  line-height: 140%;
+  color: #315d94;
+}
+div#header select option {
+  padding: 0 0.2em;
+}
+
+div#sidebar {
+  display: none;
+  float: left;
+  margin-left: 26px;
+  width: 45em;
+  min-height: 20em;
+  padding: 0.75em;
+  padding-top: 0;
+
+  border-right: 1px solid #cfcfcf;
+}
+div#content {
+  margin-left: 0px;
+}
+
+div.viewOptions {
+  float: right;
+  font-size: 92%;
+  color: #5f5f5f;
+  margin-top: 1em;
+}
+hr {
+  visibility: hidden;
+  display: inline;
+  padding: 0 0.5em;
+}
+div.viewOptions input {
+  font-family: Helvetica, sans-serif;
+  font-size: 100%;
+  border: 1px solid #b5b5b5;
+  -webkit-border-radius: 6px;
+  padding: 0.3em 0.4em;
+}
+div.viewOptions input:focus {
+  border-color: white;
+}
+
+.k {
+  opacity: 0.4;
+  font-weight: normal;
+  padding-left: 0.1em;
+}
+
+.legend {
+  font-size: 84%;
+  padding: 0;
+  padding-top: 0.4em;
+  margin-top: 2em;
+  text-align: right;
+  line-height: 140%;
+  color: #7f7f7f;
+}
+.legend h3 {
+  padding: 0;
+  padding-right: 0.5em;
+  margin: 0;
+  font-weight: normal;
+  color: black;
+  display: inline;
+  font-size: 100%;
+}
+.legend .swatch {
+  opacity: 0.66;
+  padding: 0 0.5em;
+  display: inline-block;
+  margin-right: 0.2em;
+  height: 0.9em;
+}
+.legend .swatch.heavyUse {
+  background: #cc0000;
+}
+
+table.list {
+  width: 100%;
+  line-height: 200%;
+  border-collapse: collapse;
+  font-size: 84%;
+  table-layout: fixed;
+}
+table.list:not([class*='filtered']) tr:nth-child(odd) td {
+  background: #eff3ff;
+}
+.hidden {
+  display: none;
+}
+table.list th {
+  padding: 0 0.5em;
+  vertical-align: top;
+  font-weight: bold;
+  color: #315d94;
+  color: black;
+  white-space: nowrap;
+}
+table.list .firstRow th {
+  text-align: left;
+  line-height: 100%;
+}
+table.list .secondRow * {
+  text-align: left;
+  border-bottom: 1px solid #b5c6de;
+}
+table.list td {
+  padding: 0 0.5em;
+  vertical-align: top;
+  line-height: 1.4em;
+  padding-top: 0.35em;
+}
+table.list tr td:nth-last-child(1),
+table.list tr th:nth-last-child(1) {
+  padding-right: 1em;
+}
+table.list:not([class*='filtered']) .tab .name {
+  padding-left: 1.5em;
+}
+
+table.list .name {
+  width: 100%;
+}
+
+table.list .name div {
+  height: 1.6em;
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
+table.list .pid {
+  width: 4em;
+  text-align: right;
+}
+table.list .pid .th {
+  padding: 0;
+}
+table.list .type {
+  width: 5em;
+}
+table.list .number {
+  width: 7em;
+  text-align: right;
+}
+table.list .total {
+  font-weight: bold;
+}
+table.list .total .name {
+  color: #315d94;
+  text-align: right;
+}
+table.list .total td {
+  border-top: 1px solid #b5c6de;
+  background: white !important;
+}
+table.list .noResults {
+  display: none;
+}
+table.list.noResults .noResults {
+  display: table-row;
+}
+table.list .noResults td {
+  text-align: center;
+  padding: 3em 0;
+  color: #3f3f3f;
+}
+
+.heavyUse {
+  color: #cc0000;
+  font-weight: bold;
+}
+
+table.list#memoryDetails tr:not([class*='firstRow']) > *:nth-child(2),
+table.list#memoryDetails tr:not([class*='firstRow']) > *:nth-child(5),
+table.list#memoryDetails tr.firstRow th:nth-child(2) {
+  border-right: 1px solid #b5c6de;
+}
+
+table.list#browserComparison tr:not([class*='firstRow']) > *:nth-child(1),
+table.list#browserComparison tr:not([class*='firstRow']) > *:nth-child(4),
+table.list#browserComparison tr.firstRow th:nth-child(1) {
+  border-right: 1px solid #b5c6de;
+}
+table.list#browserComparison .name {
+  padding-left: 25px;
+  background-position: 5px center;
+  background-repeat: no-repeat;
+}
+
+div.help {
+  display: inline-block;
+  width: 14px;
+  margin: -1px 0;
+  height: 14px;
+  background: url('help.gif') center bottom no-repeat;
+  opacity: 0.33;
+}
+div.help:hover {
+  opacity: 1;
+}
+div.help div {
+  display: none;
+}
+#helpTooltip {
+  z-index: 1000;
+  position: absolute;
+  background: #d6e8ff;
+  padding: 0.3em 0.8em;
+  max-width: 30em;
+  -webkit-box-shadow: 3px 3px 4px rgba(0, 0, 0, 0.33);
+  border: 1px solid #a8cfff;
+  -webkit-border-radius: 0;
+  line-height: 140%;
+  font-size: 92%;
+}
+#helpTooltip p {
+  margin: 0.6em 0;
+}
+div.otherbrowsers {
+  font-family: Helvetica, sans-serif;
+  font-size: 84%;
+  width: 100%;
+  text-align: center;
+}
+</style>
+<script>
+function reload() {
+  if (document.getElementById('helpTooltip'))
+    return;
+  history.go(0);
+}
+
+function formatNumber(str) {
+  str += '';
+  if (str == '0') {
+    return 'N/A ';
+  }
+  var x = str.split('.');
+  var x1 = x[0];
+  var x2 = x.length > 1 ? '.' + x[1] : '';
+  var regex = /(\d+)(\d{3})/;
+  while (regex.test(x1)) {
+    x1 = x1.replace(regex, '$1' + ',' + '$2');
+  }
+  return x1;
+}
+
+function addToSum(id, value) {
+  var target = document.getElementById(id);
+  var sum = parseInt(target.innerHTML);
+  sum += parseInt(value);
+  target.innerHTML = sum;
+}
+
+function handleHelpTooltipMouseOver(event) {
+  var el = document.createElement('div');
+  el.id = 'helpTooltip';
+  el.innerHTML = event.toElement.getElementsByTagName('div')[0].innerHTML;
+  el.style.top = 0;
+  el.style.left = 0;
+  el.style.visibility = 'hidden';
+  document.body.appendChild(el);
+
+  var width = el.offsetWidth;
+  var height = el.offsetHeight;
+
+  if (event.pageX - width - 50 + document.body.scrollLeft >= 0 ) {
+    el.style.left = (event.pageX - width - 20) + 'px';
+  } else {
+    el.style.left = (event.pageX + 20) + 'px';
+  }
+
+
+  if (event.pageY - height - 50 + document.body.scrollTop >= 0) {
+    el.style.top = (event.pageY - height - 20) + 'px';
+  } else {
+    el.style.top = (event.pageY + 20) + 'px';
+  }
+
+  el.style.visibility = 'visible';
+}
+
+function handleHelpTooltipMouseOut(event) {
+  var el = document.getElementById('helpTooltip');
+  el.parentNode.removeChild(el);
+}
+
+function enableHelpTooltips() {
+  var helpEls = document.getElementsByClassName('help');
+
+  for (var i = 0, helpEl; helpEl = helpEls[i]; i++) {
+    helpEl.onmouseover = handleHelpTooltipMouseOver;
+    helpEl.onmouseout = handleHelpTooltipMouseOut;
+  }
+}
+
+//setInterval("reload()", 10000);
+</script>
+</head>
+<body>
+    <div id='header'>
+      <h1>
+        About memory
+      </h1>
+      <p>
+        Measuring memory usage in a multi-process browser
+      </p>
+    </div>
+
+    <div id='content'>
+      <h2>
+        Summary
+        <div class='help'>
+          <div>
+            <p>
+              Summary of memory used by currently active browsers.<p>
+              For Chromium, processes used to to display diagnostics
+              information (such as this "about:memory") are excluded.
+            </p>
+          </div>
+        </div>
+      </h2>
+
+      <table class='list' id='browserComparison'>
+        <colgroup>
+          <col class='name' />
+          <col class='number' />
+          <col class='number' />
+        </colgroup>
+        <tr class='firstRow doNotFilter'>
+          <th>
+          </th>
+          <th colspan='2'>
+            Memory
+            <div class='help'>
+              <div>
+                <p>
+                  <strong>Memory</strong>
+                </p>
+                <p>
+                  <strong>Resident:</strong>
+                  Amount of memory that is present in physical RAM.
+                  This is the best indicator of browser memory resource usage.
+                </p>
+                <p>
+                  <strong>Virtual:</strong>
+                  Amount of address space allocated in virtual memory.
+                </p>
+
+                <p>
+                  <i>(Note that the memory for this tab is not included in the browser totals.)</i>
+                </p>
+              </div>
+            </div>
+          </th>
+        </tr>
+        <tr class='secondRow doNotFilter'>
+          <th class='name'>
+            Browser
+          </th>
+          <th class='name'>
+            Resident
+          </th>
+          <th class='number'>
+            Virtual
+          </th>
+        </tr>
+        <tr jsselect="browsers">
+          <td class='name'>
+            <div>
+              <strong jscontent="name"></strong> <span jscontent="version"></span>
+            </div>
+          </td>
+          <td class='number'>
+            <span class='th' jscontent="formatNumber(ws_shareable)"></span><span class='k'>k</span>
+          </td>
+          <td class='number'>
+            <span class='th' jscontent="formatNumber(comm_priv)"></span><span class='k'>k</span>
+          </td>
+        </tr>
+      </table>
+      <div class=otherbrowsers jsdisplay="browsers.length == 1">
+        Note: If other browsers (e.g., Safari, Firefox, Camino) are running, I'll show their memory details here.
+      </div>
+      <div class="otherbrowsers">
+        (Bug: We seriously overcount our own memory usage: <a href="http://crbug.com/25454">Issue 25454</a>.)
+      </div>
+
+      <br /><br /><br />
+
+      <h2>
+        Processes
+        <div class='help'>
+          <div>
+            <p>
+              Details of memory usage for each of Chromium's processes.
+            </p>
+          </div>
+        </div>
+      </h2>
+
+      <table class='list' id='memoryDetails'>
+        <colgroup>
+          <col class='pid' />
+          <col class='name' />
+          <col class='number' />
+          <col class='number' />
+        </colgroup>
+        <tr class='firstRow doNotFilter'>
+          <th>
+          </th>
+          <th>
+          </th>
+          <th colspan='2'>
+            Memory
+          </th>
+        </tr>
+        <tr class='secondRow doNotFilter'>
+          <th class='pid'>
+            PID
+          </th>
+          <th class='name'>
+            Name
+          </th>
+          <th class='number'>
+            Resident
+          </th>
+          <th class='number'>
+            Virtual
+          </th>
+        </tr>
+
+        <tr jsselect="browzr_data">
+          <td class='pid'>
+            <span class='th' jscontent="pid"></span>
+          </td>
+          <td class='name'>
+            <div>
+              Browser
+            </div>
+          </td>
+          <td class='number'>
+            <span class='th' jscontent="formatNumber(ws_shareable)"></span><span class='k'>k</span>
+          </td>
+          <td class='number'>
+            <span class='th' jscontent="formatNumber(comm_priv)"></span><span class='k'>k</span>
+          </td>
+        </tr>
+        <tr jsselect="child_data">
+          <td class='pid'>
+            <span class='th' jscontent="pid"></span>
+          </td>
+          <td class='name'>
+            <div jscontent="child_name"></div>
+            <div jsselect="titles">
+              <span jscontent="$this"></span><br>
+            </div>
+          </td>
+          <td class='number'>
+            <span class='th' jscontent="formatNumber(ws_shareable)"></span><span class='k'>k</span>
+          </td>
+          <td class='number'>
+            <span class='th' jscontent="formatNumber(comm_priv)"></span><span class='k'>k</span>
+          </td>
+        </tr>
+
+        <tr class='noResults'>
+          <td colspan='99'>
+            No results found.
+          </td>
+        </tr>
+      </table>
+      <div class="otherbrowsers">
+        (Note: Due to memory sharing between processes, summing memory usage does not give total memory usage.)
+      </div>
+    </div>
+</body>
+<script>
+  enableHelpTooltips();
+</script>
+</html>