diff options
| author | Steven Rostedt <srostedt@redhat.com> | 2009-03-02 13:53:59 -0500 |
|---|---|---|
| committer | Steven Rostedt <srostedt@redhat.com> | 2009-03-02 14:27:27 -0500 |
| commit | 981d081ec8b958b7d962ee40d433581a55d40fc5 (patch) | |
| tree | 366aa5da7dc98cc2354002946e6f19ec60c02301 /kernel/trace/trace.h | |
| parent | f9520750c4c9924c14325cd951efae5fae58104c (diff) | |
tracing: add format file to describe event struct fields
This patch adds the "format" file to the trace point event directory.
This is based off of work by Tom Zanussi, in which a file is exported
to be tread from user land such that a user space app may read the
binary record stored in the ring buffer.
# cat /debug/tracing/events/sched/sched_switch/format
field:pid_t prev_pid; offset:12; size:4;
field:int prev_prio; offset:16; size:4;
field special:char next_comm[TASK_COMM_LEN]; offset:20; size:16;
field:pid_t next_pid; offset:36; size:4;
field:int next_prio; offset:40; size:4;
Idea-from: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index cf6ba4181b1..e606633fb49 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -754,6 +754,7 @@ struct ftrace_event_call { int (*raw_init)(void); int (*raw_reg)(void); void (*raw_unreg)(void); + int (*show_format)(struct trace_seq *s); }; void event_trace_printk(unsigned long ip, const char *fmt, ...); |