Re: [PATCH v4 6/7] sched: add function nr_running_cpu to expose number of tasks running on cpu
From: Tim Chen
Date: Tue Jul 15 2014 - 14:41:46 EST
On Tue, 2014-07-15 at 14:07 +0200, Peter Zijlstra wrote:
> On Tue, Jul 15, 2014 at 11:50:45AM +0200, Peter Zijlstra wrote:
> > So you already have an idle notifier (which is x86 only, we should fix
> > that I suppose), and you then double check there really isn't anything
> > else running.
> Note that we've already done a large part of the expense of going idle
> by the time we call that idle notifier -- in specific, we've
> reprogrammed the clock to stop the tick.
> Its really wasteful to then generate work again, which means we have to
> again reprogram the clock etc.
Will try another version of the patch without using the idle notifier.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/