RE: [Xen-devel] PG_arch_1

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Magenheimer, Dan
>(HP Labs Fort Collins)
>Sent: 2005年12月7日 9:13
>
>Xenlinux uses a special architecture-dependent bit in the page table,
>called PG_arch_1 to indicate that a page is "foreign" (PG_foreign).
>It also apparently uses it to determine if a page is pinned (PG_pinned).
>
>Linux/ia64 (and apparently Linux/ppc and Linux/ppc64) use the PG_arch_1
>bit for other purposes.  On Linux/ia64, it is used to determine if
>the instruction cache needs to be flushed (e.g. if writing data
>into code pages).
>
>Any thought on this apparent conflict?
>
>Thanks,
>Dan

Add a new PG_arch_2, since there're two level architectures within xenlinux 
world?

Thanks,
Kevin

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