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xen-devel
Re: [Xen-devel] [PATCH][2/17] USB virt 2.6 split driver---xenidc buffer
On 22 Nov 2005, at 11:22, Muli Ben-Yehuda wrote:
Quoth Linus[1[:
"vmalloc() is NOT SOMETHING YOU SHOULD EVER USE! It's only valid for
when you _need_ a big array, and you don't have any choice. It's slow,
and it's a very restricted resource: it's a global resource that is
literally restricted to a few tens of megabytes. It should be _very_
carefully used."
He also says the correct fix is to not need a multi-page chunk in the
first place. If you do, then you should pre-allocate. If that's
impossible (e.g., you're a module) then you use vmalloc(). The page
allocator does not attempt any compaction, so even if there is plenty
of memory you may well not find a big contiguous extent.
-- Keir
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