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

1 files changed, 85 insertions, 0 deletions

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.
+}