diff options
| author | Markus Metzger <markus.t.metzger@intel.com> | 2008-11-25 09:12:31 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-25 17:31:13 +0100 |
| commit | 8bba1bf5e2434c83f2fe8b1422604ace9bbe4cb8 (patch) | |
| tree | 3df07de04de7e3a838dbf544e6a98eadac37b027 /kernel/trace | |
| parent | 6abb11aecd888d1da6276399380b7355f127c006 (diff) | |
x86, ftrace: call trace->open() before stopping tracing; add trace->print_header()
Add a callback to allow an ftrace plug-in to write its own header.
Move the call to trace->open() up a few lines.
The changes are required by the BTS ftrace plug-in.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 11 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 1 |
2 files changed, 8 insertions, 4 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a45b59e53fb..8df8fdd69c9 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2298,7 +2298,9 @@ static int s_show(struct seq_file *m, void *v) seq_printf(m, "# tracer: %s\n", iter->trace->name); seq_puts(m, "#\n"); } - if (iter->iter_flags & TRACE_FILE_LAT_FMT) { + if (iter->trace && iter->trace->print_header) + iter->trace->print_header(m); + else if (iter->iter_flags & TRACE_FILE_LAT_FMT) { /* print nothing if the buffers are empty */ if (trace_empty(iter)) return 0; @@ -2350,6 +2352,10 @@ __tracing_open(struct inode *inode, struct file *file, int *ret) iter->trace = current_trace; iter->pos = -1; + /* Notify the tracer early; before we stop tracing. */ + if (iter->trace && iter->trace->open) + iter->trace->open(iter); + /* Annotate start of buffers if we had overruns */ if (ring_buffer_overruns(iter->tr->buffer)) iter->iter_flags |= TRACE_FILE_ANNOTATE; @@ -2375,9 +2381,6 @@ __tracing_open(struct inode *inode, struct file *file, int *ret) /* stop the trace while dumping */ tracing_stop(); - if (iter->trace && iter->trace->open) - iter->trace->open(iter); - mutex_unlock(&trace_types_lock); out: diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 28c15c2ebc2..717f9f045c6 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -311,6 +311,7 @@ struct tracer { int (*selftest)(struct tracer *trace, struct trace_array *tr); #endif + void (*print_header)(struct seq_file *m); enum print_line_t (*print_line)(struct trace_iterator *iter); /* If you handled the flag setting, return 0 */ int (*set_flag)(u32 old_flags, u32 bit, int set); |