From: Frederik Deweerdt <frederik.deweerdt@xprog.eu>
To: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>,
Ravikiran G Thirumalai <kiran@scalex86.org>,
tglx@linutronix.de, hpa@zytor.com, linux-kernel@vger.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array
Date: Wed, 14 Jan 2009 16:10:24 +0100 [thread overview]
Message-ID: <20090114151024.GH10720@gambetta> (raw)
In-Reply-To: <20090114152001.GS23848@one.firstfloor.org>
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@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-01-14 15:10 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 21:35 [patch] tlb flush_data: replace per_cpu with an array Frederik Deweerdt
2009-01-12 21:46 ` Ingo Molnar
2009-01-12 21:57 ` Andi Kleen
2009-01-12 22:10 ` Frederik Deweerdt
2009-01-12 22:32 ` Andi Kleen
2009-01-12 22:50 ` Ingo Molnar
2009-01-12 22:40 ` Ingo Molnar
2009-01-12 22:59 ` H. Peter Anvin
2009-01-13 2:43 ` Andi Kleen
2009-01-13 12:28 ` Ingo Molnar
2009-01-12 22:34 ` Ravikiran G Thirumalai
2009-01-12 23:00 ` Ingo Molnar
2009-01-12 23:09 ` Ingo Molnar
2009-01-13 2:14 ` Ravikiran G Thirumalai
2009-01-13 12:00 ` Peter Zijlstra
2009-01-13 12:33 ` Ingo Molnar
2009-01-13 18:13 ` Ravikiran G Thirumalai
2009-01-13 18:34 ` Ingo Molnar
2009-01-13 18:42 ` Ravikiran G Thirumalai
2009-01-14 7:31 ` Ingo Molnar
2009-01-15 7:15 ` Ravikiran G Thirumalai
2009-01-14 9:08 ` Andi Kleen
2009-01-14 14:41 ` Frederik Deweerdt
2009-01-14 15:20 ` Andi Kleen
2009-01-14 15:10 ` Frederik Deweerdt [this message]
2009-01-12 22:54 ` Mike Travis
2009-01-12 23:51 ` Frederik Deweerdt
2009-01-12 23:57 ` Mike Travis
2009-01-13 0:01 ` Ingo Molnar
2009-01-13 3:36 ` Andi Kleen
2009-01-13 12:14 ` Ingo Molnar
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