From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zachary Amsden <zach@vmware.com>
Subject: Re: pgd_alloc and [cd]tors
Date: Thu, 16 Nov 2006 21:14:52 -0800
Message-ID: <455D454C.9040808@vmware.com>
References: <455D0773.2050906@goop.org> <455D1A0C.6010001@vmware.com>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Chris Wright <chrisw@sous-sol.org>, Virtualization Mailing List <virtualization@lists.osdl.org>
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Jeremy Fitzhardinge wrote:
> Zachary Amsden wrote:
>   =

>> Actually, vmalloc mapping replication is not quite straightforward -
>> you have to replicate it under locks and track all pgds using pgd_list
>> if you support large pages.
>>     =

>
> But that machinery already exists.  It would continue to work under PAE
> wouldn't it?
>   =


No, it doesn't exist under PAE, since PAE uses a common pgd[3] therefore =

the init_mm pgd never needs changing for large page / split page PD =

transitions.  The code is there for non-PAE, but compiled out of the PAE =

version.

Zach