ProcessMetrics::GetCPUUsage() is Slow

base/process/process_metrics_unittest.cc

 // Copyright 2013 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/process/process_metrics.h"
 
 #include <sstream>
 #include <string>
 
 #include "base/threading/thread.h"
@@ skipping 305 matching lines @@
   EXPECT_EQ(12 + 16, base::ParseProcStatCPU(kTopStat));
 
   // cat /proc/self/stat on a random other machine I have.
   const char kSelfStat[] = "5364 (cat) R 5354 5364 5354 34819 5364 "
       "0 142 0 0 0 "
       "0 0 0 0 "  // <- No CPU, apparently.
       "16 0 1 0 1676099790 2957312 114 4294967295 134512640 134528148 "
       "3221224832 3221224344 3086339742 0 0 0 0 0 0 0 17 0 0 0";
 
   EXPECT_EQ(0, base::ParseProcStatCPU(kSelfStat));
+
+  // Some weird long-running process with a weird name that I created for the
+  // purposes of this test.
+  const char kWeirdNameStat[] = "26115 (Hello) You ()))  ) R 24614 26115 24614"
+      " 34839 26115 4218880 227 0 0 0 "
+      "5186 11 0 0 "
+      "20 0 1 0 36933953 4296704 90 18446744073709551615 4194304 4196116 "
+      "140735857761568 140735857761160 4195644 0 0 0 0 0 0 0 17 14 0 0 0 0 0 "
+      "6295056 6295616 16519168 140735857770710 140735857770737 "
+      "140735857770737 140735857774557 0";
+  EXPECT_EQ(5186 + 11, base::ParseProcStatCPU(kWeirdNameStat));
+}
+
+TEST(ProcessMetricsTest, GetCpuFromProcStats) {
+  // /proc/self/stat for a process running "top".
+  const char kTopStat[] = "960 (top) S 16230 960 16230 34818 960 "
+      "4202496 471 0 0 0 "
+      "12 16 0 0 "  // <- These are the goods.
+      "20 0 1 0 121946157 15077376 314 18446744073709551615 4194304 "
+      "4246868 140733983044336 18446744073709551615 140244213071219 "
+      "0 0 0 138047495 0 0 0 17 1 0 0 0 0 0";
+  EXPECT_EQ(12 + 16, base::GetCpuFromProcStats(kTopStat));
+
+  // cat /proc/self/stat on a random other machine I have.
+  const char kSelfStat[] = "5364 (cat) R 5354 5364 5354 34819 5364 "
+      "0 142 0 0 0 "
+      "0 0 0 0 "  // <- No CPU, apparently.
+      "16 0 1 0 1676099790 2957312 114 4294967295 134512640 134528148 "
+      "3221224832 3221224344 3086339742 0 0 0 0 0 0 0 17 0 0 0";
+  EXPECT_EQ(0, base::GetCpuFromProcStats(kSelfStat));
+
+  // Some weird long-running process with a weird name that I created for the
+  // purposes of this test.
+  const char kWeirdNameStat[] = "26115 (Hello) You ()))  ) R 24614 26115 24614"
+      " 34839 26115 4218880 227 0 0 0 "
+      "5186 11 0 0 "
+      "20 0 1 0 36933953 4296704 90 18446744073709551615 4194304 4196116 "
+      "140735857761568 140735857761160 4195644 0 0 0 0 0 0 0 17 14 0 0 0 0 0 "
+      "6295056 6295616 16519168 140735857770710 140735857770737 "
+      "140735857770737 140735857774557 0";
+  EXPECT_EQ(5186 + 11, base::GetCpuFromProcStats(kWeirdNameStat));
 }
 #endif // defined(OS_LINUX) || defined(OS_ANDROID)
 
 // Disable on Android because base_unittests runs inside a Dalvik VM that
 // starts and stop threads (crbug.com/175563).
 #if defined(OS_LINUX)
 // http://crbug.com/396455
 TEST(ProcessMetricsTest, DISABLED_GetNumberOfThreads) {
   const base::ProcessHandle current = base::GetCurrentProcessHandle();
   const int initial_threads = base::GetNumberOfThreads(current);
   ASSERT_GT(initial_threads, 0);
   const int kNumAdditionalThreads = 10;
   {
     scoped_ptr<base::Thread> my_threads[kNumAdditionalThreads];
     for (int i = 0; i < kNumAdditionalThreads; ++i) {
       my_threads[i].reset(new base::Thread("GetNumberOfThreadsTest"));
       my_threads[i]->Start();
       ASSERT_EQ(base::GetNumberOfThreads(current), initial_threads + 1 + i);
     }
   }
   // The Thread destructor will stop them.
   ASSERT_EQ(initial_threads, base::GetNumberOfThreads(current));
 }
 #endif  // defined(OS_LINUX)
 
 }  // namespace debug
 }  // namespace base