Re: Short question about the mmap method

[Tommy Reynolds]

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Uttered "Steffen Persvold" <[e-mail]>, spoke thus:

> Hi lkml readers,
> 
> I have a question regarding drivers implementing the mmap and nopage methods.
> In some references I've read that pages in kernel allocated memory (either
> allocated with kmalloc, vmalloc or__get_free_pages) should be set to reserved
> (mem_map_reserve or set_bit(PG_reserved, page->flags) before they can be
> mmap'ed to guarantee that they can't be swapped out. Is this true ?

[kv]malloc memory is _never_ subject to paging and can be mmap'ed with a
vengeance without resorting to mucking about with marking pages or the like.

You're working too hard ;-)

-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- + -- -- -- -- -- -- -- -- -- --
Tommy Reynolds                               | mailto: <[e-mail]>
Red Hat, Inc., Embedded Development Services | Phone:  [phone]
307 Wynn Drive NW, Huntsville, AL 35805 USA  | FAX:    [phone]
Senior Software Developer                    | Mobile: [phone]

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