linux-kernel - Re: [patch] tlb flush_data: replace per

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Message-ID: <20090114151024.GH10720@gambetta>
Date:	Wed, 14 Jan 2009 16:10:24 +0100
From:	Frederik Deweerdt <frederik.deweerdt@...og.eu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array

On Wed, Jan 14, 2009 at 04:20:01PM +0100, Andi Kleen wrote:
> > To be fair, it also depends on whenever HOTPLUG_CPU is on or not (if it
> > is we allocate NR_CPUS percpu sections).
> 
> not true to my knowledge. Even a !HOTPLUG_CPU kernel doesn't
> allocate more than what is in the possible map. That would be dumb 
> if it was true, but it isn't fortunately.
My point is that possible map == NR_CPUS if HOTPLUG_CPU
> 
> I don't think it does.
>  In that case, which is Ubuntu's
> > and Fedora's, 
> 
> You're saying that Ubuntu and Fedora do not support suspend to ram?
> (suspend to ram requires CPU hotplug). At least my Fedora box
> does S3 just fine so that cannot be correct.
> 
> we do save memory.
> > This would make for a fairly long changelog, how about a link to this
> > thread, and removing the NR_CPUS bit?
> 
> My original paragraph is correct and it's not long. At least your
> claim is just wrong.
> 
> -Andi
> 
> -- 
> ak@...ux.intel.com -- Speaking for myself only.
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