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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>
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Johannes Berg
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Steven Rostedt
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Feb 13, 2012
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,41 @@ | ||
#undef TRACE_SYSTEM | ||
#define TRACE_SYSTEM printk | ||
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#if !defined(_TRACE_PRINTK_H) || defined(TRACE_HEADER_MULTI_READ) | ||
#define _TRACE_PRINTK_H | ||
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#include <linux/tracepoint.h> | ||
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TRACE_EVENT_CONDITION(console, | ||
TP_PROTO(const char *log_buf, unsigned start, unsigned end, | ||
unsigned log_buf_len), | ||
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TP_ARGS(log_buf, start, end, log_buf_len), | ||
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TP_CONDITION(start != end), | ||
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TP_STRUCT__entry( | ||
__dynamic_array(char, msg, end - start + 1) | ||
), | ||
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TP_fast_assign( | ||
if ((start & (log_buf_len - 1)) > (end & (log_buf_len - 1))) { | ||
memcpy(__get_dynamic_array(msg), | ||
log_buf + (start & (log_buf_len - 1)), | ||
log_buf_len - (start & (log_buf_len - 1))); | ||
memcpy((char *)__get_dynamic_array(msg) + | ||
log_buf_len - (start & (log_buf_len - 1)), | ||
log_buf, end & (log_buf_len - 1)); | ||
} else | ||
memcpy(__get_dynamic_array(msg), | ||
log_buf + (start & (log_buf_len - 1)), | ||
end - start); | ||
((char *)__get_dynamic_array(msg))[end - start] = 0; | ||
), | ||
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TP_printk("%s", __get_str(msg)) | ||
); | ||
#endif /* _TRACE_PRINTK_H */ | ||
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/* This part must be outside protection */ | ||
#include <trace/define_trace.h> |
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