linux-kernel - Re: [RFC] Transparent on-demand memory setup initialization embedded in the (GFP) buddy allocator

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Message-Id: <20130626062850.a7ce5806.akpm@linux-foundation.org>
Date:	Wed, 26 Jun 2013 06:28:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Mike Travis <travis@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Nathan Zimmer <nzimmer@....com>, holt@....com, rob@...dley.net,
	tglx@...utronix.de, mingo@...hat.com, yinghai@...nel.org,
	gregkh@...uxfoundation.org, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC] Transparent on-demand memory setup initialization
 embedded in the (GFP) buddy allocator

On Wed, 26 Jun 2013 11:22:48 +0200 Ingo Molnar <mingo@...nel.org> wrote:

> except that on 32 TB 
> systems we don't spend ~2 hours initializing 8,589,934,592 page heads.

That's about a million a second which is crazy slow - even my prehistoric desktop
is 100x faster than that.

Where's all this time actually being spent?
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