linux-kernel - Re: [RFC][PATCH] Introduce CLOCK_REALTIME

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Date:	Sat, 18 Jul 2009 23:48:01 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Chris Snook <chris.snook@...il.com>,
	john stultz <johnstul@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...x.de>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <ak@...e.de>, nikolag@...ibm.com,
	Darren Hart <dvhltc@...ibm.com>
Subject: Re: [RFC][PATCH] Introduce CLOCK_REALTIME_COARSE

On Sat, 2009-07-18 at 23:14 -0700, Arjan van de Ven wrote:
> it's on x86.. likely/unlikely don't impact the CPU (since there are no
> "ignore the branch predictor" hints), only the code placement.....

But code placement does affect branch prediction (e.g. the Pentium 4
static predictor assumes backward branches are taken, recent AMD
processors prefer you to arrange code such that conditional branches are
not taken, etc.)

-- 
Nicholas Miell <nmiell@...cast.net>

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