On Wed, 2007-05-23 at 10:40 -0400, Jason Baron wrote:
> On Wed, 23 May 2007, Peter Zijlstra wrote:
>
> > Count lock contention events per lock class. Additionally track the first four
> > callsites that resulted in the contention.
> >
>
> I think that we need the total number of locking calls, not just the total
> number of *contended* locking calls, in order to make the data
> significant. Same for waittime. Yes, this pollutes the fastpath. In the
> contention case, its one extra addition, and for the waittime, its a call
> the sched_clock(). I don't think that's too much to pay for much more
> meaningful data.
The holdtime statistics add these numbers.
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