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From: Ingo Molnar <mingo@elte.hu>
To: Marin Mitov <mitov@issp.bas.bg>
Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] new TSC based delay_tsc()
Date: Mon, 19 Nov 2007 09:54:24 +0100	[thread overview]
Message-ID: <20071119085424.GA10760@elte.hu> (raw)
In-Reply-To: <200711181120.27459.mitov@issp.bas.bg>


* Marin Mitov <mitov@issp.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@issp.bas.bg>

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

	Ingo

  reply	other threads:[~2007-11-19  8:54 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-18  9:20 [PATCH]new_TSC_based_delay_tsc() Marin Mitov
2007-11-19  8:54 ` Ingo Molnar [this message]
  -- strict thread matches above, loose matches on Subject: below --
2007-11-20 19:32 [PATCH]new_TSC_based_delay_tsc() Marin Mitov
2007-11-20 21:37 ` [PATCH] new TSC based delay_tsc() Ingo Molnar

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