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

sandbox/linux/suid/process_util.h

Index: sandbox/linux/suid/process_util.h
diff --git a/sandbox/linux/suid/process_util.h b/sandbox/linux/suid/process_util.h
index 6bab897048aa81d64144972032a3b43b0ddaf23d..46604253290d9f7f033c4ee9d954a377f3c814b3 100644
--- a/sandbox/linux/suid/process_util.h
+++ b/sandbox/linux/suid/process_util.h
@@ -15,9 +15,14 @@
 
 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_