tracing: Add "uptime" trace clock that uses jiffies

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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>

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Steven Rostedt (Red Hat) 2013-03-14 13:13:45 -04:00 • committed by Steven Rostedt

parent 328df4759c

commit 8aacf017b0

3 changed files with 12 additions and 0 deletions

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1

include/linux/trace_clock.h

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1

kernel/trace/trace.c

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10

kernel/trace/trace_clock.c

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