Add docs about OOM killer.

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diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bd273c9e8966d568ce679a182173fcb6da41bcc0..13b3879b88d42bb27f547eab4292b781ec9676b6 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,4 +1,4 @@
-
+
 
 
  Operating System Environment
@@ -1258,8 +1258,10 @@ Out of Memory: Killed process 12345 (postgres).
     kernel's behavior so that it will not overcommit memory.
     Although this setting will not prevent the OOM killer from
     invoking altogether, it will lower the chances significantly and
-    will therefore lead to more robust system behavior.  This is done
-    by selecting strict overcommit mode via sysctl:
+    will therefore lead to more robust system behavior.  (It might also
+    cause fork() to fail when the machine appears to have available
+    memory.) This is done by selecting strict overcommit mode via
+    sysctl:
 
 sysctl -w vm.overcommit_memory=2