linux-kernel - Re: [PATCH] new TSC based delay

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Message-ID: <20071119085424.GA10760@elte.hu>
Date:	Mon, 19 Nov 2007 09:54:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Marin Mitov <mitov@...p.bas.bg>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] new TSC based delay_tsc()


* Marin Mitov <mitov@...p.bas.bg> wrote:

> Hi all,
> 
> This is a patch based on the Ingo's idea/patch to track delay_tsc() 
> migration to another cpu by comparing smp_processor_id(). It is 
> against kernel-2.6.24-rc3.
> 
> What is different:
> 1. Using unsigned (instead of long) to unify for i386/x86_64.
> 2. Minimal preempt_disable/enable() critical sections
>    (more room for preemption)
> 3. some statements have been rearranged, to account for
>     possible under/overflow of left/TSC
> 
> Tested on both: 32/64 bit SMP PREEMPT kernel-2.6.24-rc3
> 
> Hope it is correct. Comments, please.

thanks! The changes look certainly good to me.

> Signed-off-by: Marin Mitov <mitov@...p.bas.bg>

Signed-off-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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