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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Ingo Molnar <mingo@elte.hu>
Cc: Con Kolivas <kernel@kolivas.org>,
	Peter Williams <pwil3058@bigpond.net.au>,
	Andrew Morton <akpm@osdl.org>,
	Nick Piggin <piggin@cyberone.com.au>,
	linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Likelihood of rt_tasks
Date: Sat, 10 Jul 2004 22:05:43 +1000	[thread overview]
Message-ID: <40EFDB97.70109@yahoo.com.au> (raw)
In-Reply-To: <20040710111528.GA22265@elte.hu>

Ingo Molnar wrote:

> the unlikely() check in rt_task() was mainly done because there was a
> steady stream of microoptimizations that added unlikely() to rt_task().
> So now we do in everywhere and have removed the unlikely()/likely()
> branches from sched.c. It doesnt really matter in real-world terms, but
> it will make the common case code (non-RT) a tiny bit more compact. And
> i challenge anyone to be able to even measure the difference to an RT
> task.
> 

Also, the scenario where it may possibly make a tiny positive
contribution (something *very* scheduler bound) would be using
non-RT tasks I'd say.

  reply	other threads:[~2004-07-10 12:06 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-07-09 10:00 Likelihood of rt_tasks Con Kolivas
2004-07-09 10:17 ` Ingo Molnar
2004-07-09 23:53 ` Peter Williams
2004-07-10  0:16   ` Con Kolivas
2004-07-10  0:41     ` Peter Williams
2004-07-10  0:45       ` Con Kolivas
2004-07-10 11:15     ` Ingo Molnar
2004-07-10 12:05       ` Nick Piggin [this message]
2004-07-10  3:57   ` Elladan
2004-07-10 11:19     ` Ingo Molnar

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