Changing OOM range to 0, 1000 and tweaking OOM algorithm.

sandbox/linux/suid/process_util.h

 // Copyright (c) 2011 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.
 
 // The following is duplicated from base/process_utils.h.
 // We shouldn't link against C++ code in a setuid binary.
 
 #ifndef SANDBOX_LINUX_SUID_PROCESS_UTIL_H_
 #define SANDBOX_LINUX_SUID_PROCESS_UTIL_H_
 
 #include <stdbool.h>
 #include <sys/types.h>
 
 #include "base/base_export.h"
 
-static const char kAdjustOOMScoreSwitch[] = "--adjust-oom-score";
-
-// This adjusts /proc/process/oom_adj so the Linux OOM killer will prefer
-// certain process types over others. The range for the adjustment is
-// [-17,15], with [0,15] being user accessible.
+// This adjusts /proc/process/oom_score_adj so the Linux OOM killer
+// will prefer certain process types over others. The range for the
+// adjustment is [-1000, 1000], with [0, 1000] being user accessible.
+//
+// If the Linux system isn't new enough to use oom_score_adj, then we
+// try to set the older oom_adj value instead, scaling the score to
+// the required range of [0, 15]. This may result in some aliasing of
+// values, of course.
 BASE_EXPORT bool AdjustOOMScore(pid_t process, int score);
 
 #endif  // SANDBOX_LINUX_SUID_PROCESS_UTIL_H_