On Wed, 2007-03-14 at 09:37 -0700, Jeremy Fitzhardinge wrote: > Daniel Walker wrote: > > Then your direction is wrong, sched_clock() should be constant ideally > > (1millisecond should really be 1millisecond). > > Rather than repeating myself, I suggest you read my original post > again. But my point is that "I was runnable on a cpu for 1ms of real > time" is a meaningless measurement: you want to measure "I ran for 1 > cpu-ms", which is a unit which depends on how work a particular CPU does > in relationship to other CPUs on the system, or even itself at some > previous time.
I understood, I just don't agree that you suggested modification are the correct ones to make. > > Like I said in the last > > email, change the scheduler to make it aware of the variable quantum > > values. > > I suppose you could, but that seems more complex. I think you could > encode the same information in the measurement of how much work a cpu > actually got done while a process was scheduled on it. I know it's more complex, but that seems more like the "right" thing to do. Daniel - 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/
