Re: [REPORT] cfs-v4 vs sd-0.44

From: Ray Lee
Date: Tue Apr 24 2007 - 11:10:29 EST

On 4/23/07, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
On Mon, 23 Apr 2007, Ingo Molnar wrote:
> The "give scheduler money" transaction can be both an "implicit
> transaction" (for example when writing to UNIX domain sockets or
> blocking on a pipe, etc.), or it could be an "explicit transaction":
> sched_yield_to(). This latter i've already implemented for CFS, but it's
> much less useful than the really significant implicit ones, the ones
> which will help X.

Yes. It would be wonderful to get it working automatically, so please say
something about the implementation..

The "perfect" situation would be that when somebody goes to sleep, any
extra points it had could be given to whoever it woke up last. Note that
for something like X, it means that the points are 100% ephemeral: it gets
points when a client sends it a request, but it would *lose* the points
again when it sends the reply!

It would seem like there should be a penalty associated with sending
those points as well, so that two processes communicating quickly with
each other won't get into a mutual love-fest that'll capture the
scheduler's attention.

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