base: Move renderer threads to the appropriate cpuset.

base/threading/platform_thread_posix.cc

 // 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.
 
 #include "base/threading/platform_thread.h"
 
 #include <errno.h>
 #include <pthread.h>
 #include <sched.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <sys/resource.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include <memory>
 
 #include "base/debug/activity_tracker.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/threading/platform_thread_internal_posix.h"
 #include "base/threading/thread_id_name_manager.h"
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 
 #if defined(OS_LINUX)
-#include "base/files/file_util.h"
-#include "base/strings/string_number_conversions.h"
 #include <sys/syscall.h>
 #endif
 
 namespace base {
 
 void InitThreading();
 void TerminateOnThread();
 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes);
 
 namespace {
 
-#if defined(OS_LINUX)
-const FilePath::CharType kCpusetDirectory[] =
-    FILE_PATH_LITERAL("/sys/fs/cgroup/cpuset/chrome");
-#endif
-
 struct ThreadParams {
   ThreadParams()
       : delegate(NULL), joinable(false), priority(ThreadPriority::NORMAL) {}
 
   PlatformThread::Delegate* delegate;
   bool joinable;
   ThreadPriority priority;
 };
 
 void* ThreadFunc(void* params) {
@@ skipping 191 matching lines @@
   return geteuid() == 0;
 #endif  // defined(OS_NACL)
 }
 
 // static
 void PlatformThread::SetCurrentThreadPriority(ThreadPriority priority) {
 #if defined(OS_NACL)
   NOTIMPLEMENTED();
 #else
 #if defined(OS_LINUX)
-  // Move thread into the appropriate cpuset when chrome cpuset directory
-  // exists. Threads with BACKGROUND priority are move to the "non-urgent"
-  // cpuset and threads with DISPLAY and REALTIME_AUDIO priority are moved
-  // to "urgent" cpuset.
-  FilePath cpuset_filepath(kCpusetDirectory);
-  switch (priority) {
-    case ThreadPriority::NORMAL:
-      break;
-    case ThreadPriority::BACKGROUND:
-      cpuset_filepath = cpuset_filepath.Append(FILE_PATH_LITERAL("non-urgent"));
-      break;
-    case ThreadPriority::DISPLAY:
-    case ThreadPriority::REALTIME_AUDIO:
-      cpuset_filepath = cpuset_filepath.Append(FILE_PATH_LITERAL("urgent"));
-      break;
-  }
-  if (DirectoryExists(cpuset_filepath)) {
-    FilePath tasks_filepath =
-        cpuset_filepath.Append(FILE_PATH_LITERAL("tasks"));
-    std::string tid = IntToString(PlatformThread::CurrentId());
-    int bytes_written = WriteFile(tasks_filepath, tid.c_str(), tid.size());
-    if (bytes_written != static_cast<int>(tid.size())) {
-      DVLOG(1) << "Failed to add " << tid << " to " << tasks_filepath.value();
-    }
-  }
-#endif  // defined(OS_LINUX)
+  SetThreadAffinity(PlatformThread::CurrentId(), priority);
+#endif
 
   if (internal::SetCurrentThreadPriorityForPlatform(priority))
     return;
 
   // setpriority(2) should change the whole thread group's (i.e. process)
   // priority. However, as stated in the bugs section of
   // http://man7.org/linux/man-pages/man2/getpriority.2.html: "under the current
   // Linux/NPTL implementation of POSIX threads, the nice value is a per-thread
   // attribute". Also, 0 is prefered to the current thread id since it is
   // equivalent but makes sandboxing easier (https://crbug.com/399473).
@@ skipping 28 matching lines @@
     return ThreadPriority::NORMAL;
   }
 
   return internal::NiceValueToThreadPriority(nice_value);
 #endif  // !defined(OS_NACL)
 }
 
 #endif  // !defined(OS_MACOSX)
 
 }  // namespace base