[Xen-devel] overheads of having lots of pages granted at a time

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

Because of some windows limitations, I am going to have to pre-allocate
page aligned buffer space for block device i/o at device setup, and copy
data between the buffer space I get in each i/o request and the buffer
space I've pre-allocated.

My options are to either grant the pages at the time I allocate them, or
to grant and ungrant each page as I submit the i/o request to xen.

>From a performance point of view, is there any problem having lots of
pages granted when you aren't using them?

Thanks

James

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