Messages in this thread | | | Date | Wed, 27 Apr 2011 16:42:07 -0500 | From | Timur Tabi <> | Subject | Re: [PATCH 2/3] make new alloc_pages_exact() |
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Dave Hansen wrote: >> Is there an easy way to verify that alloc_pages_exact(5MB) really does allocate >> > only 5MB and not 8MB?
> I'm not sure why you're asking. How do we know that the _normal_ > allocator only gives us 4k when we ask for 4k? Well, that's just how it > works. If alloc_pages_exact() returns success, you know it's got the > amount of memory that you asked for, and only that plus a bit of masking > for page alignment. > > Have you seen alloc_pages_exact() behaving in some other way?
I've never tested this part of alloc_pages_exact(), even when I wrote (the first version of) it. I just took it on faith that it actually did what it was supposed to do.
-- Timur Tabi Linux kernel developer at Freescale
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