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