linux-kernel - Re: [git pull] scheduler updates

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Message-ID: <alpine.LFD.2.00.0811081026280.3468@nehalem.linux-foundation.org>
Date:	Sat, 8 Nov 2008 10:28:21 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>
Subject: Re: [git pull] scheduler updates

On Sat, 8 Nov 2008, Ingo Molnar wrote:
>
> Ingo Molnar (2):
>       sched: improve sched_clock() performance
>       sched: optimize sched_clock() a bit

Btw, why do we do that _idiotic_ rdtsc_barrier() AT ALL?

No sane user can possibly want it. If you do 'rdtsc', there's nothing you 
can do about a few cycles difference due to OoO _anyway_. Adding barriers 
is entirely meaningless - it's not going to make the return value mean 
anything else.

Can we please just remove that idiocy? Or can somebody give a _sane_ 
argument for it?

		Linus
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