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xen-devel
[Xen-devel] Re: [RFC PATCH 08/35] Add Xen-specific memory management def
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To: |
Chris Wright <chrisw@xxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [RFC PATCH 08/35] Add Xen-specific memory management definitions |
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From: |
Pete Zaitcev <zaitcev@xxxxxxxxxx> |
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Date: |
Wed, 17 May 2006 09:06:45 -0700 |
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xen-devel@xxxxxxxxxxxxxxxxxxx, ian.pratt@xxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, zaitcev@xxxxxxxxxx, Christian.Limpach@xxxxxxxxxxxx |
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Wed, 17 May 2006 09:07:26 -0700 |
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On Tue, 09 May 2006 00:00:08 -0700, Chris Wright <chrisw@xxxxxxxxxxxx> wrote:
> +static inline unsigned long pfn_to_mfn(unsigned long pfn)
> +{
> +#ifndef CONFIG_XEN_SHADOW_MODE
> + if (xen_feature(XENFEAT_auto_translated_physmap))
> + return pfn;
> + return phys_to_machine_mapping[(unsigned int)(pfn)] &
> + ~FOREIGN_FRAME_BIT;
> +#else
> + return pfn;
> +#endif
> +}
Why do we need several modes in Linux guests?
If a significant tradeoff exists (for example, between performance
and maximum addressable memory), then we need to think about the
real issue instead of throwing config options into the pot.
-- Pete
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