linux-kernel - Re: Question: RT schedular : task_tick_rt(struct rq *rq, structtask_struct *p) : decreases overhead when rq->nr

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Message-ID: <20070809065916.GB30046@elte.hu>
Date:	Thu, 9 Aug 2007 08:59:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mitchell Erblich <erblichs@...thlink.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Question: RT schedular : task_tick_rt(struct rq *rq,
	structtask_struct *p) : decreases overhead when  rq->nr_running == 1


* Mitchell Erblich <erblichs@...thlink.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
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