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From: Ingo Molnar <mingo@elte.hu>
To: Mitchell Erblich <erblichs@earthlink.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Question: RT schedular : task_tick_rt(struct rq *rq, structtask_struct *p) : decreases overhead when  rq->nr_running == 1
Date: Thu, 9 Aug 2007 08:59:16 +0200	[thread overview]
Message-ID: <20070809065916.GB30046@elte.hu> (raw)
In-Reply-To: <000501c7da16$838dea40$6501a8c0@earthlink.net>


* Mitchell Erblich <erblichs@earthlink.net> wrote:

> First, RT/RR tasks are not deprecated. [...]

I'm confused, do you say this in reference to anything i said? I did not 
say that RR tasks are deprecated and you were top-posting so i cannot 
connect it to anything specific. I only said RR tasks are _rare_:

>> this is a pretty rare codepath because the overwhelming majority of 
>> RT apps uses SCHED_FIFO [...]

and i hope you can see the difference between 'rare' and 'deprecated' 
;-) And i suspect you also missed the last bit of what i wrote:

>> So this is on several levels an uncommon workload and by adding a 
>> check like that we'd increase the codesize. But ... no strong 
>> feelings against this optimization - if you send a proper patch we 
>> can apply it, it certainly makes sense from a logic POV.

and you also missed the first bit it appears:

>> your change is a possible optimization, [...]

so you are banging, with full force, on completely open doors =B-)

	Ingo

      reply	other threads:[~2007-08-09  6:59 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-08 23:47 Mitchell Erblich
2007-08-09  6:59 ` Ingo Molnar [this message]

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