On Thu, 12 Sep 2013 03:16:00 +0000
"Du, Yuyang" <[email protected]> wrote:

> Because I want to save start and end snapshots of some state.
> 

I'm not exactly sure what you want. You can use the new "snapshot"
feature (available since 3.10) and save the start and stop of a state
without the need of tracing it.

echo 1 > /sys/kernel/debug/tracing/snapshot
cat /sys/kernel/debug/tracing/snapshot

-- Steve
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