mono and mono_raw trace clocks access CLOCK_MONOTONIC and CLOCK_MONOTONIC_RAW
clocks for tracing purposes. Add documentation for the same.
Signed-off-by: Joel Fernandes <joe...@google.com>
---
Steven,
I skipped adding docs for boot clock as that patch is still being discussed,
but please accept documentation for the other clocks you said were missing.
I will follow with the boot clock documentation at a later time. Thanks.
Documentation/trace/ftrace.txt | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index 185c39f..32cc1ee 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -362,6 +362,14 @@ of ftrace. Here is a list of some of the key files:
to correlate events across hypervisor/guest if
tb_offset is known.
+ mono: This uses the fast monotonic clock (CLOCK_MONOTONIC)
+ which is monotonic and is subject to NTP rate adjustments.
+
+ mono_raw:
+ This is the raw monotonic clock (CLOCK_MONOTONIC_RAW)
+ which is montonic but is not subject to any rate adjustments
+ and ticks at the same rate as the hardware clocksource.
+
To set a clock, simply echo the clock name into this file.
echo global > trace_clock
--
2.8.0.rc3.226.g39d4020
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