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Date:	Tue, 14 Oct 2014 17:59:10 +0100
From:	David Vrabel <>
To:	Juergen Gross <>, <>,
	<>, <>,
Subject: Re: [Xen-devel] [PATCH] xen: delay construction of mfn_list_list

On 14/10/14 12:33, Juergen Gross wrote:
> The 3 level p2m tree for the Xen tools is constructed very early at
> boot by calling xen_build_mfn_list_list(). Memory needed for this tree
> is allocated via extend_brk().
> As this tree (other than the kernel internal p2m tree) is only needed
> for domain save/restore, live migration and crash dump analysis it
> doesn't matter whether it is constructed very early or just some
> milliseconds later when memory allocation is possible by other means.
> This patch moves the call of xen_build_mfn_list_list() just after
> calling xen_pagetable_p2m_copy() simplifying this function, too, as it
> doesn't have to bother with two parallel trees now. The same applies
> for some other internal functions.
> While simplifying code, make early_can_reuse_p2m_middle() static and
> drop the unused second parameter. p2m_mid_identity_mfn can be removed
> as well, it isn't used either.
> Signed-off-by: Juergen Gross <>
> ---
>  arch/x86/xen/enlighten.c |  3 ---
>  arch/x86/xen/mmu.c       |  5 +++-
>  arch/x86/xen/p2m.c       | 65 +++++++++++-------------------------------------
>  3 files changed, 18 insertions(+), 55 deletions(-)


Applied to stable/for-linus-3.18



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