lkml.org 
[lkml]   [2009]   [Jul]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3 3/4] ftrace: add tracepoint for hrtimer
From
Date
On Thu, 2009-07-23 at 18:01 +0800, Xiao Guangrong wrote:
>
> Peter Zijlstra wrote:
>
> > OK, so what you want to measure is the time of the actual callback
> > happening (hrtimer_entry) vs that where you would have expected it to
> > happen (hrtimer_start + delay), right?
> >
>
> Yes
>
> > So what's wrong with printing the expected expiration time in the
> > hrtimer_start tracepoint in the cheap clock units?
> >
>
> Is "cheap clock units" means jiffies time?

Nah, something like cpu_clock() which is monotonic per-cpu and should
have high resolution where available.


\
 
 \ /
  Last update: 2009-07-23 12:09    [from the cache]
©2003-2011 Jasper Spaans