From: Zachary Amsden <zach@vmware.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Chris Wright <chrisw@sous-sol.org>,
Virtualization Mailing List <virtualization@lists.osdl.org>
Subject: Re: pgd_alloc and [cd]tors
Date: Thu, 16 Nov 2006 18:10:20 -0800 [thread overview]
Message-ID: <455D1A0C.6010001@vmware.com> (raw)
In-Reply-To: <455D0773.2050906@goop.org>
Jeremy Fitzhardinge wrote:
> Is there any real use in having a ctor/dtor for the pgd cache? Given
> that all pgd allocation happens via pgd_alloc/pgd_free, why not just
> fold the [cd]tor in?
>
> I'm asking because Xen wants pgd[3] to be unshared in the PAE case, and
> it looks to me like the easiest way to handle that is by making
> pgd_alloc/free pv-ops and doing the appropriate thing in the Xen code.
> Would need to sort out the vmalloc mapping replication as well, but I
> think that's pretty straightforward.
>
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.
Zach
next prev parent reply other threads:[~2006-11-17 2:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-17 0:50 pgd_alloc and [cd]tors Jeremy Fitzhardinge
2006-11-17 1:28 ` Chris Wright
2006-11-17 2:10 ` Zachary Amsden [this message]
2006-11-17 5:04 ` Jeremy Fitzhardinge
2006-11-17 5:14 ` Zachary Amsden
2006-11-17 7:14 ` Jeremy Fitzhardinge
2006-11-17 8:33 ` Gerd Hoffmann
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