Re: [PATCH] Make highly niced processes run only when idle

Pavel Machek
2001-12-20T10:07:50Z

Hi!

> > Even better would be to keep the process at low priority while in userland
> > and reverts to normal "nice" priority while in kernelspace.
>
> But the point of a SCHED_IDLE would be to only run them while idle, so
> they can still never even get the CPU.
>
> Ahh ... wait, do you mean periodically run them, but only give them the
> boost while they are in kernel space? Very good idea. Can you see an
> easy way to do this?

This was done before... As I wrote... Make it flag similar to "this is
being ptraced" to get out of fast path, and rest is easy. Unset
"low_priority" on entering of kernel, and set it back on exit from
kernel.

Pavel
--
"I do not steal MS software. It is not worth it."
-- Pavel Kankovsky