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ddb(4): document some missing commands

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This is not exhaustive, just what I collected while working on
mac_ddb(4).

Reviewed by:	pauamma, markj, jhb
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation (in part)
Differential Revision:	https://reviews.freebsd.org/D37333
This commit is contained in:
Mitchell Horne 2022-11-11 14:22:29 -04:00
parent 94f6ee56e3
commit 831979ae0f
1 changed files with 48 additions and 0 deletions
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48
share/man/man4/ddb.4
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@ -538,6 +538,14 @@ Switch the debugger to the thread with ID
if the argument is a decimal number, or address
.Ar addr ,
otherwise.
.Pp
.It Ic watchdog Op Ar exp
Program the
.Xr watchdog 4
timer to fire in
.Pf 2^ Ar exp
seconds.
If no argument is provided, the watchdog timer is disabled.
.El
.Ss SPECIALIZED HELPER COMMANDS
.Bl -tag -width indent -compact
@ -549,6 +557,10 @@ Prints the address of the thread whose kernel-mode stack contains
.Ar addr ,
if any.
.Pp
.It Ic show Cm active trace
.It acttrace
Show a stack trace for every thread running on a CPU.
.Pp
.It Ic show Cm all procs Ns Op Li / Ns Cm a
.It Ic ps Ns Op Li / Ns Cm a
Display all process information.
@ -602,6 +614,15 @@ addresses, and Resource IDs.
Dump data about APIC IDT vector mappings.
.\"
.Pp
.It Ic show Cm badstacks
Walk the
.Xr witness 4
graph and print any lock-order violations.
This command is only available if
.Xr witness 4
is included in the kernel.
.\"
.Pp
.It Ic show Cm breaks
Show breakpoints set with the "break" command.
.\"
@ -723,6 +744,13 @@ present at
.Ar addr .
.\"
.Pp
.It Ic show Cm iosched Ar addr
Show information about the I/O scheduler
.Vt struct cam_iosched_softc
located at
.Ar addr .
.\"
.Pp
.It Ic show Cm inodedeps Op Ar addr
Show brief information about each inodedep structure.
If
@ -750,6 +778,22 @@ Dump the interrupt statistics.
Show interrupt lines and their respective kernel threads.
.\"
.Pp
.It Ic show Cm ktr Ns Op Li / Ns Cm a Ns Cm v Ns Cm V
Print the contents of the
.Xr ktr 4
trace buffer.
The
.Cm v
modifier will request fully verbose output, causing the file, line number, and
timestamp to be printed for each trace entry.
The
.Cm V
modifier will request only the timestamps to be printed.
The
.Cm a
modifier will request that the output be unpaginated.
.\"
.Pp
.It Ic show Cm lapic
Show information from the local APIC registers for this CPU.
.\"
@ -1170,6 +1214,10 @@ subsystem.
.El
.Ss OFFLINE DEBUGGING COMMANDS
.Bl -tag -width indent -compact
.It Ic dump
Initiate a kernel core dump to the device(s) configured by
.Xr dumpon 8 .
.Pp
.It Ic gdb
Switches to remote GDB mode.
In remote GDB mode, another machine is required that runs