buddyinfo is not documented in proc; the attached patch provides a
brief but I think clear description of the file contents.
Andrew
diff --git a/man5/proc.5 b/man5/proc.5
index ed47f70..3f0275b 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -1075,6 +1075,11 @@ Advanced power management version and battery information when
.B CONFIG_APM
is defined at kernel compilation time.
.TP
+.I /proc/buddyinfo
+A list of page collections available for allocation in each memory
+zone. Order of two page collections go from left to right (1, 2, 4,
+etc) while zones are listed from top to bottom.
+.TP
.I /proc/bus
Contains subdirectories for installed busses.
.TP
