On Tue, Nov 11, 2014 at 08:58:35AM -0600, Christoph Lameter wrote: > On Mon, 10 Nov 2014, Frederic Weisbecker wrote: > > > Ok, I confess we moved part of that housekeeping to the > > syscall/exception/interrupt > > entry path. We did that for cputime accounting and RCU. And it's possible to > > even do that for timekeeping. But then the kernel entrypoint is going to be > > extremely > > costly. It's worth CPU 0 as a sacrificial lamb. > > Well we can redirect to the scheduler setting the task flag and handle > costly stuff there if necessary?
"there" here is the syscall/exception/interrupt entry path. And like I said, updating timekeeping from these places is overkill (although we do it in interrupt entry on dynticks-idle, but we don't have timekeeping when all system is idle). -- 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/
