Re: [patch] voluntary-preempt-2.6.9-rc1-bk12-R6

From: Ingo Molnar
Date: Thu Sep 09 2004 - 16:02:00 EST



* Lee Revell <rlrevell@xxxxxxxxxxx> wrote:

> > I believe Scott Wood suggested a fix back when I first reported this,
> > have to check my mailbox. Scott?
>
> Nope, checking the original thread, Scott pointed out that any RT
> process will have mlockall'ed anyway and thus won't be affected by
> this latency. So, this one would be cool to fix, but it's not a
> problem as such.

RT threads will be affected by this latency just as much because it's a
non-preemptable critical section. You are right in that an RT task wont
see the overhead itself because it doesnt generate swap entries.

Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/