Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

On Sun, Apr 15, 2007 at 10:48:24PM +0200, Ingo Molnar wrote:
2) plugsched did not allow on the fly selection of schedulers, nor did
it allow a per CPU selection of schedulers. IO schedulers you can
change per disk, on the fly, making them much more useful in
practice. Also, IO schedulers (while definitely not being slow!) are
alot less performance sensitive than CPU schedulers.

One of the reasons I never posted my own code is that it never met its
own design goals, which absolutely included switching on the fly. I
think Peter Williams may have done something about that. It was my hope
to be able to do insmod sched_foo.ko until it became clear that the
effort it was intended to assist wasn't going to get even the limited
hardware access required, at which point I largely stopped working on
it.


On Sun, Apr 15, 2007 at 10:48:24PM +0200, Ingo Molnar wrote:
3) I/O schedulers are pretty damn clean code, and plugsched, at least
the last version i saw of it, didnt come even close.

I'm not sure what happened there. It wasn't a big enough patch to take
hits in this area due to getting overwhelmed by the programming burden
like some other efforts of mine. Maybe things started getting ugly once
on-the-fly switching entered the picture. My guess is that Peter Williams
will have to chime in here, since things have diverged enough from my
one-time contribution 4 years ago.


-- wli
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