linux-kernel - Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by changing tlb flush size

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Message-Id: <1179214452.32247.170.camel@localhost.localdomain>
Date:	Tue, 15 May 2007 17:34:12 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Tsutomu OWA <tsutomu.owa@...hiba.co.jp>
Cc:	Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...abs.org,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 4/4] powerpc 2.6.21-rt1: reduce scheduling latency by
	changing tlb flush size

On Tue, 2007-05-15 at 13:12 +0900, Tsutomu OWA wrote:

> > With this code, you get silent side-effects of enabling PPC_CELLEB
> > along with another platform.
> 
>   Yeah, thank you for pointing it out.
>   I'll send revised patch later.
> 
> > Maybe instead you should change the hpte_need_flush() to always flush
> > when running on the celleb platform and PREEMPT_RT is enabled.
> 
>   Hmm... Is it in linux-2.6.21?  grep'ing it did not help... 
> 
>   Is http://patchwork.ozlabs.org/linuxppc/patch?id=10361 is the first place
> where the hpte_need_flush() appears?

Yes, I added that when reworking the batching mecanism.

Ben.


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