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xen-devel
[Xen-devel] Re: [RFC PATCH 30/35] Add generic_page_range() function
Chris Wright wrote:
Add a new mm function generic_page_range() which applies a given
function to every pte in a given virtual address range in a given mm
structure. This is a generic alternative to cut-and-pasting the Linux
idiomatic pagetable walking code in every place that a sequence of
PTEs must be accessed.
Although this interface is intended to be useful in a wide range of
situations, it is currently used specifically by several Xen
subsystems, for example: to ensure that pagetables have been allocated
for a virtual address range, and to construct batched special
pagetable update requests to map I/O memory (in ioremap()).
This interface is great, and highly useful. But it doesn't seem to be
able to work on native hardware, as it doesn't support large pages.
Zach
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