1 .\" Copyright (c) 2001 John H. Baldwin <jhb@FreeBSD.org>
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25 .\" $FreeBSD: src/share/man/man9/ktr.9,v 1.8 2005/03/08 01:37:36 hmp Exp $
26 .\" $DragonFly: src/share/man/man9/ktr.9,v 1.5 2005/03/08 01:57:23 hmp Exp $
32 .Nm CTR0 , CTR1 , CTR2 , CTR3 , CTR4 , CTR5 , CTR6
33 .Nd kernel tracing facility
37 .Vt "extern int ktr_cpumask" ;
38 .Vt "extern int ktr_entries" ;
39 .Vt "extern int ktr_extend" ;
40 .Vt "extern int ktr_mask" ;
41 .Vt "extern int ktr_verbose" ;
42 .Vt "extern struct ktr_entry ktr_buf[]" ;
44 .Fn CTR0 "u_int mask" "char *format"
46 .Fn CTR1 "u_int mask" "char *format" "arg1"
48 .Fn CTR2 "u_int mask" "char *format" "arg1" "arg2"
50 .Fn CTR3 "u_int mask" "char *format" "arg1" "arg2" "arg3"
52 .Fn CTR4 "u_int mask" "char *format" "arg1" "arg2" "arg3" "arg4"
54 .Fn CTR5 "u_int mask" "char *format" "arg1" "arg2" "arg3" "arg4" "arg5"
56 .Fn CTR6 "u_int mask" "char *format" "arg1" "arg2" "arg3" "arg4" "arg5" "arg6"
58 KTR provides a circular buffer of events that can be logged in a
62 These events can then be dumped with
68 Events are created and logged in the kernel via the
71 The first parameter is a mask of event types
75 The event will be logged only if any of the event types specified in
77 are enabled in the global event mask stored in
83 style format string used to build the text of the event log message.
86 string are zero to five arguments referenced by
88 Note that the different macros differ only in the number of arguments each
89 one takes, as indicated by its name.
90 Each event is logged with a timestamp in addition to the log message.
94 variable contains the number of entries in the
97 These variables are mostly useful for post-mortem crash dump tools to locate
98 the base of the circular trace buffer and its length.
102 variable contains the run time mask of events to log.
104 The CPU event mask is stored in the
110 variable stores the verbose flag that controls whether events are logged to
111 the console in addition to the event buffer.
113 This example demonstrates the use of tracepoints at the
116 .Bd -literal -compact
122 * Pick a new current process and record its start time.
125 CTR3(KTR_PROC, "mi_switch: old proc %p (pid %d, %s)", p, p->p_pid,
130 CTR3(KTR_PROC, "mi_switch: new proc %p (pid %d, %s)", p, p->p_pid,
138 The KTR kernel tracing facility first appeared in
140 and was imported into