base: Move renderer threads to the appropriate cpuset.

base/threading/platform_thread_posix.cc

Index: base/threading/platform_thread_posix.cc
diff --git a/base/threading/platform_thread_posix.cc b/base/threading/platform_thread_posix.cc
index 4f6d3802c3d67ba4734b01026f123344e79023d9..357f800db78a58836da010e76b8df2216973f306 100644
--- a/base/threading/platform_thread_posix.cc
+++ b/base/threading/platform_thread_posix.cc
@@ -25,8 +25,6 @@
 #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
 
@@ -38,11 +36,6 @@ 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) {}
@@ -254,32 +247,8 @@ void PlatformThread::SetCurrentThreadPriority(ThreadPriority priority) {
   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;