linux-kernel - Re: [RFC PATCH RT] push waiting rt tasks to cpus with lower prios.

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Message-ID: <Pine.LNX.4.58.0710091413290.23629@gandalf.stny.rr.com>
Date:	Tue, 9 Oct 2007 14:14:31 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Gregory Haskins <ghaskins@...ell.com>
cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	kravetz@...ibm.com, LKML <linux-kernel@...r.kernel.org>,
	pmorreale@...ell.com, sdietrich@...ell.com
Subject: Re: [RFC PATCH RT] push waiting rt tasks to cpus with lower prios.


--
On Tue, 9 Oct 2007, Steven Rostedt wrote:

> This has been complied tested (and no more ;-)
>
>
> The idea here is when we find a situation that we just scheduled in an
> RT task and we either pushed a lesser RT task away or more than one RT
> task was scheduled on this CPU before scheduling occurred.
>
> The answer that this patch does is to do a O(n) search of CPUs for the
> CPU with the lowest prio task running. When that CPU is found the next
> highest RT task is pushed to that CPU.

I don't want that O(n) to scare anyone. It really is a O(1) but with a
K = NR_CPUS. I was saying if you grow the NR_CPUS the search grows too.

-- Steve

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