base: Move renderer threads to the appropriate cpuset.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 9e2aa1c63738e4396a14e26bb2b503987dfa7b76..1c6b5d7efa5f90530949ce2fbbc59c7839449657 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -89,6 +89,11 @@
 #include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
 #endif
 
+#if defined(OS_LINUX)
+#include "base/linux_util.h"
+#include "base/threading/platform_thread.h"
+#endif
+
 namespace content {
 namespace {
 
@@ -204,6 +209,10 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message) {
         OnAllocateLockedDiscardableSharedMemory)
     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_DeletedDiscardableSharedMemory,
                         OnDeletedDiscardableSharedMemory)
+#if defined(OS_LINUX)
+    IPC_MESSAGE_HANDLER(ChildProcessHostMsg_SetThreadPriority,
+                        OnSetThreadPriority)
+#endif
     IPC_MESSAGE_HANDLER_DELAY_REPLY(RenderProcessHostMsg_Keygen, OnKeygen)
     IPC_MESSAGE_HANDLER(RenderProcessHostMsg_DidGenerateCacheableMetadata,
                         OnCacheableMetadataAvailable)
@@ -414,6 +423,35 @@ void RenderMessageFilter::OnDeletedDiscardableSharedMemory(
           this, id));
 }
 
+#if defined(OS_LINUX)
+void RenderMessageFilter::SetThreadPriorityOnFileThread(
+    base::PlatformThreadId ns_tid,
+    base::ThreadPriority priority) {
+  bool ns_pid_supported = false;
+  pid_t peer_tid = base::FindThreadID(peer_pid(), ns_tid, &ns_pid_supported);
+  if (peer_tid == -1) {
+    if (ns_pid_supported)
+      DLOG(WARNING) << "Could not find tid";
+    return;
+  }
+
+  if (peer_tid == peer_pid()) {
+    DLOG(WARNING) << "Changing priority of main thread is not allowed";

[Nico, 2016/09/19 20:49:30]

remove (?)

[reveman, 2016/09/19 21:43:39]

Remove the warning log for this case? I'd like to keep it in case we
accidentally write some code in the renderer that tries to do this and this
would at least give some warning to the developer that it's not working as
expected. It's a DLOG to prevent a malicious renderer from flooding the log.

+    return;
+  }
+
+  base::PlatformThread::SetThreadPriority(peer_tid, priority);
+}
+
+void RenderMessageFilter::OnSetThreadPriority(base::PlatformThreadId ns_tid,
+                                              base::ThreadPriority priority) {
+  BrowserThread::PostTask(
+      BrowserThread::FILE_USER_BLOCKING, FROM_HERE,
+      base::Bind(&RenderMessageFilter::SetThreadPriorityOnFileThread, this,
+                 ns_tid, priority));
+}
+#endif
+
 void RenderMessageFilter::OnCacheableMetadataAvailable(
     const GURL& url,
     base::Time expected_response_time,