Messages in this thread | | | Date | Wed, 11 Dec 2013 21:11:42 -0500 | From | Steven Rostedt <> | Subject | Re: [RFC PATCH] drivers: char: Add a dynamic clock for the trace clock |
| |
On Wed, 11 Dec 2013 18:06:06 -0800 Sonny Rao <sonnyrao@chromium.org> wrote:
> > ftrace has several clocks that it uses: > > > > o local - basically sched_clock() > > o global - something like hpet that is monotonic across CPUs but slower > > o counter - a simple atomic counter (no time associated to it) > > o uptime - jiffy counter > > o perf - trace_clock, which is what perf uses > > o x86_tsc - the raw tsc counter. > > > > # cat /sys/kernel/debug/trace_clock > > [local] global counter uptime perf x86-tsc > > > > Ah ok sorry for the incorrect info there, thanks for clarifying. > So, If I wanted to make sure everything is synced up between ftrace > events and perf events I should say perf here instead of local.
Correct, that's why I created that clock.
-- Steve
| |