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authorJohannes Berg <johannes.berg@intel.com>2011-11-24 20:03:08 +0100
committerSteven Rostedt <rostedt@goodmis.org>2012-02-13 13:46:05 -0500
commit95100358491abaa2e9a5483811370059bbca4645 (patch)
tree4fc32c4bf2ef4416b4a914f5426f96ba58f29ec1 /kernel/printk.c
parentcdfb0d30e943f36c8a074a26c3d168a05bdbb372 (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 'kernel/printk.c')
-rw-r--r--kernel/printk.c5
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)) {