__get_free_pages() internal

["Peter Teoh" <htmldeveloper@xxxxxxxxx>]

Just a newbie question:   __get_free_pages() - how does it worked?

It is really just my guess - attempted tracing really did not answer
all the following question - as it was just too deep....

first, it should attempt to allocate space from physical mem...and it
uses max_pfn as the mark to guide it.

correct?  question:   multiple processor may be attempting to allocate
/ call __get_free_pages() at the same time - and uses max_pfn as the
guide on the maximum available physical frames.   so how is the
coordination done?  (if it is a lock, what is the name of the global
lock?)

On the other hand, because i cannot find the link between max_pfn and
__get_free_pages() - so question is how does __get_free_pages() know
where the max pfn it can used for memory allocation?

next, it should then update the pagetable entries - right?   PAE and
non-PAE will have different path.   correct?   roughly where are these
done in kernel?

essentially...it should be marking the pagetable entries for the block
of memory as "notfree" - right?   what is the function used?   thanks.

-- 
Regards,
Peter Teoh

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