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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-03-14 13:13:45 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-03-15 00:36:09 -0400 |
| commit | 8aacf017b065a805d27467843490c976835eb4a5 (patch) | |
| tree | 3e3ee23502cf2cc6d02baa1f7625b1ef16611eda /kernel/trace/trace.c | |
| parent | 328df4759c03e2c3e7429cc6cb0e180c38f32063 (diff) | |
| download | lwn-8aacf017b065a805d27467843490c976835eb4a5.tar.gz lwn-8aacf017b065a805d27467843490c976835eb4a5.zip | |
tracing: Add "uptime" trace clock that uses jiffies
Add a simple trace clock called "uptime" for those that are
interested in the uptime of the trace. It uses jiffies as that's
the safest method, as other uptime clocks grab seq locks, which could
cause a deadlock if taken from an event or function tracer.
Requested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index f90ca16afcf2..8eabfbb8003e 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -647,6 +647,7 @@ static struct { { trace_clock_local, "local", 1 }, { trace_clock_global, "global", 1 }, { trace_clock_counter, "counter", 0 }, + { trace_clock_jiffies, "uptime", 1 }, ARCH_TRACE_CLOCKS }; |