linux-kernel - Re: [PATCH] sched: rsdl check for niced tasks lowering prio level

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Message-ID: <460285FF.40408@o2.pl>
Date:	Thu, 22 Mar 2007 14:34:55 +0100
From:	Artur Skawina <art_k@...pl>
To:	Con Kolivas <kernel@...ivas.org>
CC:	Jeffrey Hundstad <jeffrey.hundstad@...u.edu>,
	linux list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] sched: rsdl check for niced tasks lowering prio level

Con Kolivas wrote:
> Here is the best fix for the bug pointed out. Thanks.

> Ensure niced tasks are not inappropriately limiting sleeping unniced tasks
> by explicitly checking what the best static priority that has run this
> major rotation was.

yes, this made the machine usable again.

After noticing that the context switch rate during a "nice -19 make
-j2" has now been halved vs stock 2.6.20, compiled a kernel under
both and RSDL w/these two patches was 2% faster; so this may be the
right direction after all :)

artur
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