Linux: Adjust /proc/pid/oom_adj to sacrifice plugin and renderer processes to...

base/process_util_linux.cc

Index: base/process_util_linux.cc
===================================================================
--- base/process_util_linux.cc	(revision 34180)
+++ base/process_util_linux.cc	(working copy)
@@ -513,7 +513,6 @@
 }  // namespace
 
 extern "C" {
-
 #if !defined(LINUX_USE_TCMALLOC)
 
 typedef void* (*malloc_type)(size_t size);
@@ -600,7 +599,6 @@
 }
 
 #endif  // !defined(LINUX_USE_TCMALLOC)
-
 }  // extern C
 
 void EnableTerminationOnOutOfMemory() {
@@ -610,4 +608,20 @@
   // malloc and friends and make them die on out of memory.
 }
 
+bool AdjustOOMScore(ProcessId process, int score) {
+  if (score < 0 || score > 15)
+    return false;
+
+  FilePath oom_adj("/proc");
+  oom_adj = oom_adj.Append(Int64ToString(process));
+  oom_adj = oom_adj.AppendASCII("oom_adj");
+
+  if (!file_util::PathExists(oom_adj))
+    return false;
+
+  std::string score_str = IntToString(score);
+  return (static_cast<int>(score_str.length()) ==
+          file_util::WriteFile(oom_adj, score_str.c_str(), score_str.length()));
+}
+
 }  // namespace base