linux-kernel - Re: [PATCH] [sched] redundant reschedule when set_user_nice() boosts a prio of a task from the "expired" array

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Message-ID: <20070407092401.GB16356@elte.hu>
Date:	Sat, 7 Apr 2007 11:24:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Con Kolivas <kernel@...ivas.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH] [sched] redundant reschedule when set_user_nice() boosts a prio of a task from the "expired" array

* Andrew Morton <akpm@...ux-foundation.org> wrote:

> so
> 
> - your code only gets publically tested in its against-staircase 
>   version
> 
> - the against-mainline version will get merged without having been
>   publically tested outside of staircase
> 
> which is probably all OK for a 2.6.22-rc1 thing, provided Ingo can 
> give a confident ack.

it looks good to me - and once i get a non-whitespace-damaged patch i'll 
put it into -rt so we'll have testing. (this patch should have at most a 
latency impact, if we forget to preempt somewhere, and -rt users are 
quite touchy about latencies.)

> Where are we at with staircase anyway?  Is it looking like a 2.6.22 
> thing? I don't personally think we've yet seen enough serious 
> performance testing to permit a merge, apart from other issues...

yes, that's my thinking too at the moment. I'd also like to see a 
summary of 'open design questions' list from Mike (if Mike has 
time/energy for that?) - many questions were raised, a good number of 
them were answered, various changes done to SD but there's no good 
summary of the current state of affairs.

	Ingo
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