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

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Message-ID: <20081108194055.GA30892@elte.hu>
Date:	Sat, 8 Nov 2008 20:40:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <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


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sat, 8 Nov 2008, Ingo Molnar wrote:
> > 
> > So that's why my change moves it from the __native_read_tsc() over 
> > to _only_ the vget_cycles().
> 
> Ahh. I was looking at native_read_tscp(). Which has no barriers. But 
> then we don't actually save the actual TSC, we only end up using the 
> "p" part, so we don't care..

sidenote #3: RDTSCP is a relatively new instruction, and has implicit 
barrier properties: it is a serializing instruction.

	Ingo
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