On 10 July 2014 13:18, Peter Zijlstra <[email protected]> wrote: > On Mon, Jun 30, 2014 at 06:05:39PM +0200, Vincent Guittot wrote: >> + /* >> + * If the CPUs share their cache and the src_cpu's capacity is >> + * reduced because of other sched_class or IRQs, we trig an >> + * active balance to move the task >> + */ >> + if ((sd->flags & SD_SHARE_PKG_RESOURCES) >> + && ((capacity_orig_of(src_cpu) * 100) > (capacity_of(src_cpu) >> * >> + sd->imbalance_pct))) >> return 1; > > Why is this tied to shared caches?
It's just to limit the change of the policy to a level that can have benefit without performance regression. I'm not sure that we can do that at any level without risk -- 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/
