linux-kernel - Re: [RFC 0/2] Delay initializing of large sections of memory

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Message-ID: <CAE9FiQUckP6m-HTdzdAJt0P_1bok-QHrxqm3RUTx=v_C=ufFCg@mail.gmail.com>
Date:	Tue, 25 Jun 2013 12:03:42 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Mike Travis <travis@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Nathan Zimmer <nzimmer@....com>, Robin Holt <holt@....com>,
	Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	linux-doc@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/2] Delay initializing of large sections of memory

> It is worth experimenting with but the big question would be,
> if it still avoids the very expensive "memmap_init_zone" and
> it's sub-functions using huge expanses of memory.  I'll do some
> experimenting as soon as I can.  Our 32TB system is being
> brought back to 16TB (we found a number of problems as we
> get closer and closer to the 64TB limit), but that's still
> a significant size.

According to Intel SDM, CPU could support 52bits physical addressing.

So how linux kernel will handle it? as we only have 48bits virtual addressing.

Yinghai
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