* Andi Kleen <[EMAIL PROTECTED]> wrote:
> On Mon, Mar 12, 2007 at 12:00:20PM +0100, Thomas Gleixner wrote:
> > On Mon, 2007-03-12 at 12:27 +0100, Andi Kleen wrote:
> > > Ingo Molnar <[EMAIL PROTECTED]> writes:
> > > >
> > > > the only correct approach is the use of hrtimers, and a patch exists
> > > > for
> > > > that - see below. This has been included in -rt for quite some time.
> > >
> > > But isn't that bad for power management? You'll likely get more
> > > idle wakeups, won't you?
> >
> > Why so ? It comes more precise, but only once.
>
> When it's clustered around the jiffies interval then wakeups from
> multiple processes will be somewhat batched. With a precise wakeup
> you'll get wakeups all over the jiffies period, won't you?
if HIGH_RES_TIMERS is disabled then that is what happens. But frankly,
most futex waits are without timeouts - if an application cares about
micro-effects like that then you are much better off not using a
per-futex timeout anyway.
Ingo
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