Re: [PATCH 12/13] hrtimer: create a "timer_slack" field in thetask struct

From: Pavel Machek
Date: Mon Sep 08 2008 - 10:15:54 EST

On Mon 2008-09-08 06:40:02, Arjan van de Ven wrote:
> On Mon, 8 Sep 2008 15:27:16 +0200
> Pavel Machek <pavel@xxxxxxx> wrote:
> > >
> > > ... which nobody uses today.
> > > It's not just new syscalls, it's a new glibc api as well at that
> > > point.
> >
> > ...and new applications, yes. I believe applications should
> > explicitely enable slacking timers.
> timers are slacking today, at least for select() and poll(), and are a
> great deal more so than the defaults in this patchkit.

Ok, so select()/poll() may default to non-zero slack for legacy apps.

> The great advantage of the prctl() approach (which is usable) over new
> system calls and glibc APIs is that it will get used, because the admin
> can use it just like he uses the "nice" command, on existing software.

Yes, it is a great advantage, but it feels like a hack. Maybe it is
better done with LD_PRELOAD or something?

I'd certianly want the applications to specify slack themselves in
like 10 years.

(cesky, pictures)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at