diff options
| author | David Sharp <dhsharp@google.com> | 2012-11-13 12:18:21 -0800 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-11-13 15:48:27 -0500 |
| commit | 8cbd9cc6254065c97c4bac42daa55ba1abe73a8e (patch) | |
| tree | bb52f23f66fc6288e7efbce76ee389af0b52cc85 /include/linux/trace_clock.h | |
| parent | 7bcfaf54f591a0775254c4ea679faf615152ee3a (diff) | |
tracing,x86: Add a TSC trace_clock
In order to promote interoperability between userspace tracers and ftrace,
add a trace_clock that reports raw TSC values which will then be recorded
in the ring buffer. Userspace tracers that also record TSCs are then on
exactly the same time base as the kernel and events can be unambiguously
interlaced.
Tested: Enabled a tracepoint and the "tsc" trace_clock and saw very large
timestamp values.
v2:
Move arch-specific bits out of generic code.
v3:
Rename "x86-tsc", cleanups
v7:
Generic arch bits in Kbuild.
Google-Bug-Id: 6980623
Link: http://lkml.kernel.org/r/1352837903-32191-1-git-send-email-dhsharp@google.com
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>
Signed-off-by: David Sharp <dhsharp@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/trace_clock.h')
| -rw-r--r-- | include/linux/trace_clock.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/trace_clock.h b/include/linux/trace_clock.h index 4eb490237d4c..d563f37e1a1d 100644 --- a/include/linux/trace_clock.h +++ b/include/linux/trace_clock.h @@ -12,6 +12,8 @@ #include <linux/compiler.h> #include <linux/types.h> +#include <asm/trace_clock.h> + extern u64 notrace trace_clock_local(void); extern u64 notrace trace_clock(void); extern u64 notrace trace_clock_global(void); |