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. thanks, -Jason - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
