Name
ktrace
Synopsis
ktrace [options
]command
Trace kernel operations for process
command
and log data to file
ktrace.out
in the current working directory. The
tracing continues until you either exit
command
or clear the trace points (with
the -c
or -C
options). Use
kdump
to view the trace log.
Options
-
-a
Append new data to the trace file instead of overwriting it.
-
-C
Stop tracing all processes run by a user invoking
ktrace
. If this option is used with superuser privileges, the tracing of all processes is stopped.-
-c
Stop tracing process command.
-
-d
Also trace any current child processes of the specified process.
-
-f
file
Log to
file
instead ofktrace.out
, the default.-
-g
pgid
Toggle tracing of all processes that are part of the process group
pgid
.-
-i
Also trace any future child processes of the specified process.
-
-p
pid
Toggle tracing of process
pid
.-
-t
tracepoints
Trace only kernel operations specified in
tracepoints
. Use the appropriate letters from this list to indicate which type of operation(s) to trace:-
c
System calls
-
i
I/O
-
n
Name translations
-
s
Signal processing
-
u
Userland operations
-
w
Context switches
Examples
Trace only system calls and I/O on process 489:
$ ktrace -t ci -p 489
Run the atlookup
command and trace all of its
kernel operations:
$ ktrace atlookup
Turn off tracing for all user processes:
$ ktrace -C
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