diff options
author | Johannes Berg <johannes.berg@intel.com> | 2011-11-24 14:03:08 -0500 |
---|---|---|
committer | Steven Rostedt <rostedt@goodmis.org> | 2012-02-13 13:46:05 -0500 |
commit | 95100358491abaa2e9a5483811370059bbca4645 (patch) | |
tree | 4fc32c4bf2ef4416b4a914f5426f96ba58f29ec1 /include | |
parent | cdfb0d30e943f36c8a074a26c3d168a05bdbb372 (diff) |
printk/tracing: Add console output tracing
Add a printk.console trace point to record any printk
messages into the trace, regardless of the current
console loglevel. This can help correlate (existing)
printk debugging with other tracing.
Link: http://lkml.kernel.org/r/1322161388.5366.54.camel@jlt3.sipsolutions.net
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/trace/events/printk.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/trace/events/printk.h b/include/trace/events/printk.h new file mode 100644 index 000000000000..94ec79cc011a --- /dev/null +++ b/include/trace/events/printk.h | |||
@@ -0,0 +1,41 @@ | |||
1 | #undef TRACE_SYSTEM | ||
2 | #define TRACE_SYSTEM printk | ||
3 | |||
4 | #if !defined(_TRACE_PRINTK_H) || defined(TRACE_HEADER_MULTI_READ) | ||
5 | #define _TRACE_PRINTK_H | ||
6 | |||
7 | #include <linux/tracepoint.h> | ||
8 | |||
9 | TRACE_EVENT_CONDITION(console, | ||
10 | TP_PROTO(const char *log_buf, unsigned start, unsigned end, | ||
11 | unsigned log_buf_len), | ||
12 | |||
13 | TP_ARGS(log_buf, start, end, log_buf_len), | ||
14 | |||
15 | TP_CONDITION(start != end), | ||
16 | |||
17 | TP_STRUCT__entry( | ||
18 | __dynamic_array(char, msg, end - start + 1) | ||
19 | ), | ||
20 | |||
21 | TP_fast_assign( | ||
22 | if ((start & (log_buf_len - 1)) > (end & (log_buf_len - 1))) { | ||
23 | memcpy(__get_dynamic_array(msg), | ||
24 | log_buf + (start & (log_buf_len - 1)), | ||
25 | log_buf_len - (start & (log_buf_len - 1))); | ||
26 | memcpy((char *)__get_dynamic_array(msg) + | ||
27 | log_buf_len - (start & (log_buf_len - 1)), | ||
28 | log_buf, end & (log_buf_len - 1)); | ||
29 | } else | ||
30 | memcpy(__get_dynamic_array(msg), | ||
31 | log_buf + (start & (log_buf_len - 1)), | ||
32 | end - start); | ||
33 | ((char *)__get_dynamic_array(msg))[end - start] = 0; | ||
34 | ), | ||
35 | |||
36 | TP_printk("%s", __get_str(msg)) | ||
37 | ); | ||
38 | #endif /* _TRACE_PRINTK_H */ | ||
39 | |||
40 | /* This part must be outside protection */ | ||
41 | #include <trace/define_trace.h> | ||