Re: realtime scheduling problems with 2.4 linux kernel >= 2.4.10

Andi Kleen (ak@muc.de)
Wed, 5 Jun 2002 14:17:55 +0200


On Wed, Jun 05, 2002 at 01:53:06PM +0200, Ian Collinson wrote:

>
> Are there any potentially negative consequences of this fix, apart from
> those already mentioned?

I don't think so.

It could still fail when you install a prio=99, SCHED_FIFO process.

> I certainly vote for this feature being preserved, as it is extremely useful
> for debugging realtime priority apps. FYI, we narrowed it down to breaking
> in either 2.4.10-pre11 or pre12.

That was when the low latency console changes went in. Before that console
switches could interrupt scheduling for a long time, causing problems
for other realtime people. The change was to move the expensive parts
of the console switch to keventd.

-Andi
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