Re: [PATCH] Staircase Scheduler v6.3 for 2.6.7-rc2

[Con Kolivas <kernel@kolivas.org>]

On Mon, 7 Jun 2004 06:59, Felipe Alfaro Solana wrote:
> On Sun, 2004-06-06 at 17:39, Con Kolivas wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > This is an update of the scheduler policy mechanism rewrite using the
> > infrastructure of the current O(1) scheduler. Slight changes from the
> > original design require a detailed description. The change to the
> > original design has enabled all known corner cases to be abolished and
> > cpu distribution to be much better maintained. It has proven to be stable
> > in my testing and is ready for more widespread public testing now.
>
> It seems this staircase scheduler has some strange interactions with
> networking and PM suspend. I can't suspend my laptop when any program is
> using the network and, what's more, after the suspend mechanism fails,
> the program that was using the network stays stuck at D state and can't
> be killed.

Could well be the autoregulated vm swappiness which triggers the unable to 
suspend when swappiness=0 bug. If not, this staircase scheduler is quite a 
large change to the scheduler priority design and there could be some weird 
interaction.

Con