--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2008-10-14  Hui Zhu  <teawater@gmail.com>
+
+	* gdb.texinfo: Add documentation for process record and replay.
+
 2008-09-30  Michael Snyder  <msnyder@vmware.com>
 
 	* gdb.texinfo: Add documentation for reverse execution.
--- a/gdb.texinfo
+++ b/gdb.texinfo
@@ -144,6 +144,7 @@ software in general.  We will miss him.
 * Running::                     Running programs under @value{GDBN}
 * Stopping::                    Stopping and continuing
 * Reverse Execution::           Running programs backward
+* Process record and replay::   Recording programs running message and replay it
 * Stack::                       Examining the stack
 * Source::                      Examining source files
 * Data::                        Examining data
@@ -4963,6 +4964,96 @@ This is the default.
 @end table
 
 
+@node Process record and replay
+@chapter Recording programs running message and replay it
+@cindex process record and replay
+@cindex recording programs running message and replay it
+
+In a architecture environment that supports process record and replay,
+process record and replay target can record a log of the process execution,
+and replay it with both forward and reverse execute commands.
+
+When this target is in use, if the next instruction to be executed is in the
+execution log, @value{GDBN} will debug in replay mode so that all the
+execution events are taken from the execution log.  Otherwise, @value{GDBN}
+will debug in record mode and record the execution log while executing
+normally.
+
+If you are debugging in a architecture environment that supports
+process record and replay, @value{GDBN} provides the following commands.
+
+@table @code
+@kindex target record
+@kindex record
+@kindex rec
+@item target record
+This a standard command to start process record and replay target.
+Process record and replay target can only debug a process that already
+running. Therefore you need to first start the process @code{run},
+and then start the recording @code{record}.
+
+@kindex stoprecord
+@kindex sr
+@item stoprecord
+Stop process record and replay target at once. When Process record and
+replay target stops, all the execution log will be deleted and the inferior
+will either be terminated, or remain in its final state.
+
+When you stop the process record and replay target in record mode (at the
+end of the execution log), the inferior will be stopped at the next
+instruction that would have been recorded. In other words, if you record
+for a while and then stop recording, the inferior process will be left in
+the same state as if you had never done any recording.
+
+On the other hand, if the process record and replay target is stopped while
+in replay mode (that is, not at the end of the execution log but at some
+earlier point), the inferior process will become "live" at that earlier state,
+and it will then be possible to continue debugging the process "live" from
+that state.
+
+When the inferior process exits, or @value{GDBN} detaches from it, process
+record and replay target will automatically stop itself.
+
+@kindex set record-auto-delete
+@item set record-auto-delete
+@itemx set record-auto-delete 1
+Set the behavior when record instructions limit is reached. 1 mean that GDB
+will auto delete the oldest record to make room for each new one.
+
+@item set record-auto-delete 0
+0 is the default value, meaning that @value{GDBN} will stop the inferior.
+
+@kindex show record-auto-delete
+@item show record-auto-delete
+Show the value of record-auto-delete.
+
+@kindex set record-insn-number-max @var{limit}
+@item set record-insn-number-max @var{limit}
+Set the limit of instructions to be recorded.  Default value is 200000.
+If set to 0, record instructions number limit function will disable.
+In this case, if record instructions number is bigger than @var{limit},
+@value{GDBN} will auto delete the earliest recorded instruction to make room
+for each new one.
+
+@kindex show record-insn-number-max
+@item show record-insn-number-max
+Show the value of recorded instructions limit.
+
+@kindex info record-insn-number
+@item info record-insn-number
+Show the current number of recorded instructions.
+
+@kindex delrecord
+@kindex dr
+@item delrecord
+When record target running in replay mode ("in the past"), delete the
+subsequent execution log and begin to record a new execution log starting
+from the current address. This has much the same effect as "changing the past"
+(see "Set values of variables", above); it means you will abandon the
+previously recorded "future" and begin recording a new "future".
+@end table
+
+
 @node Stack
 @chapter Examining the Stack