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| author | Johannes Berg <johannes.berg@intel.com> | 2011-11-24 20:03:08 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-02-13 13:46:05 -0500 |
| commit | 95100358491abaa2e9a5483811370059bbca4645 (patch) | |
| tree | 4fc32c4bf2ef4416b4a914f5426f96ba58f29ec1 /kernel/printk.c | |
| parent | cdfb0d30e943f36c8a074a26c3d168a05bdbb372 (diff) | |
| download | linux-95100358491abaa2e9a5483811370059bbca4645.tar.gz linux-95100358491abaa2e9a5483811370059bbca4645.tar.bz2 linux-95100358491abaa2e9a5483811370059bbca4645.zip | |
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 'kernel/printk.c')
| -rw-r--r-- | kernel/printk.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index 13c0a1143f49..cb8a6bd697c6 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -44,6 +44,9 @@ #include <asm/uaccess.h> +#define CREATE_TRACE_POINTS +#include <trace/events/printk.h> + /* * Architectures can override it: */ @@ -542,6 +545,8 @@ MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to" static void _call_console_drivers(unsigned start, unsigned end, int msg_log_level) { + trace_console(&LOG_BUF(0), start, end, log_buf_len); + if ((msg_log_level < console_loglevel || ignore_loglevel) && console_drivers && start != end) { if ((start & LOG_BUF_MASK) > (end & LOG_BUF_MASK)) { |