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Commit ec3a9039 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Ingo Molnar
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tracing/kprobe: Update example output in documentation 



Update example output in documentation according to current
implementation.

Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100105224641.19431.34967.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 56b03f3c

Documentation/trace/kprobetrace.txt

+17 −16
Original line number Diff line number Diff line
@@ -97,23 +97,24 @@ recording return value as "myretprobe" event. 


  cat /sys/kernel/debug/tracing/events/kprobes/myprobe/format

name: myprobe

ID: 75

ID: 780

format:

	field:unsigned short common_type;	offset:0;	size:2;

	field:unsigned char common_flags;	offset:2;	size:1;

	field:unsigned char common_preempt_count;	offset:3;	size:1;

	field:int common_pid;	offset:4;	size:4;

	field:int common_tgid;	offset:8;	size:4;



	field: unsigned long ip;	offset:16;tsize:8;

	field: int nargs;	offset:24;tsize:4;

	field: unsigned long dfd;	offset:32;tsize:8;

	field: unsigned long filename;	offset:40;tsize:8;

	field: unsigned long flags;	offset:48;tsize:8;

	field: unsigned long mode;	offset:56;tsize:8;



print fmt: "(%lx) dfd=%lx filename=%lx flags=%lx mode=%lx", REC->ip, REC->dfd, REC->filename, REC->flags, REC->mode



        field:unsigned short common_type;       offset:0;       size:2; signed:0;

        field:unsigned char common_flags;       offset:2;       size:1; signed:0;

        field:unsigned char common_preempt_count;       offset:3; size:1;signed:0;

        field:int common_pid;   offset:4;       size:4; signed:1;

        field:int common_lock_depth;    offset:8;       size:4; signed:1;



        field:unsigned long __probe_ip; offset:12;      size:4; signed:0;

        field:int __probe_nargs;        offset:16;      size:4; signed:1;

        field:unsigned long dfd;        offset:20;      size:4; signed:0;

        field:unsigned long filename;   offset:24;      size:4; signed:0;

        field:unsigned long flags;      offset:28;      size:4; signed:0;

        field:unsigned long mode;       offset:32;      size:4; signed:0;





print fmt: "(%lx) dfd=%lx filename=%lx flags=%lx mode=%lx", REC->__probe_ip,

REC->dfd, REC->filename, REC->flags, REC->mode



 You can see that the event has 4 arguments as in the expressions you specified.