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powerpc/ftrace: add powerpc timebase as a trace clock source

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Add a new powerpc-specific trace clock using the timebase register,
similar to x86-tsc. This gives us
- a fast, monotonic, hardware clock source for trace entries, and
- a clock that can be used to correlate events across cpus as well as across
  hypervisor and guests.

Signed-off-by: Naveen N. Rao <[email protected]>
Acked-by: Steven Rostedt <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
This commit is contained in:
Naveen N. Rao 2015-04-24 14:24:44 +05:30 • committed by Michael Ellerman
commit 197165d449
5 changed files with 40 additions and 1 deletions
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5
Documentation/trace/ftrace.txt
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@ -346,6 +346,11 @@ of ftrace. Here is a list of some of the key files:
x86-tsc: Architectures may define their own clocks. For
example, x86 uses its own TSC cycle clock here.
ppc-tb: This uses the powerpc timebase register value.
This is in sync across CPUs and can also be used
to correlate events across hypervisor/guest if
tb_offset is known.
To set a clock, simply echo the clock name into this file.
echo global > trace_clock