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Message-Id: <200704031237.21946.kernel@kolivas.org>
Date: Tue, 3 Apr 2007 12:37:21 +1000
From: Con Kolivas <kernel@...ivas.org>
To: Mike Galbraith <efault@....de>
Cc: Ingo Molnar <mingo@...e.hu>,
linux list <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
ck list <ck@....kolivas.org>
Subject: Re: [PATCH] sched: staircase deadline misc fixes
On Thursday 29 March 2007 15:50, Mike Galbraith wrote:
> On Thu, 2007-03-29 at 09:44 +1000, Con Kolivas wrote:
> + * This contains a bitmap for each dynamic priority level with empty slots
> + * for the valid priorities each different nice level can have. It allows
> + * us to stagger the slots where differing priorities run in a way that
> + * keeps latency differences between different nice levels at a minimum.
> + * ie, where 0 means a slot for that priority, priority running from left
> to + * right:
> + * nice -20 0000000000000000000000000000000000000000
> + * nice -10 1001000100100010001001000100010010001000
> + * nice 0 0101010101010101010101010101010101010101
> + * nice 5 1101011010110101101011010110101101011011
> + * nice 10 0110111011011101110110111011101101110111
> + * nice 15 0111110111111011111101111101111110111111
> + * nice 19 1111111111111111111011111111111111111111
Try two instances of chew.c at _differing_ nice levels on one cpu on mainline,
and then SD. This is why you can't renice X on mainline.
> -Mike
--
-ck
View attachment "chew.c" of type "text/x-csrc" (1028 bytes)
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