On Thu, 10 Aug 2006 14:46:01 +0000 (GMT)
moreau francis <[email protected]> wrote:
>
> Why not implementing page_exist() by simply using mem_map[] ? When
> allocating mem_map[], we can just fill it with a special value. And
> then when registering memory area, we clear this special value with
> the "reserved" value. Hence for flatmem model, we can have:
>
> #define page_exist(pfn) (mem_map[pfn] != SPECIAL_VALUE)
>
putting a special value to a page struct at mem_map + pfn ?
> and it should work for sparsemem too and other models that will use
> mem_map[].
>
> Another point, is page_exist() going to replace page_valid() ?
what is page_valid() here ? pfn_valid() (in current kernel) ?
> I mean page_exist() is going to be something more accurate than
> page_valid(). All tests on page_valid() _only_ will be fine to test
> page_exist(). But all tests such:
>
> if (page_valid(x) && page_is_ram(x))
>
> can be replaced by
>
> if (page_exist(x))
>
> So, again, why not simply improving page_valid() definition rather
> than introduce a new service ?
>
I welcome to do that if implementation is sane.
pfn_valid() --- check there is a page struct
page_exist() --- check there is a physical memory.
but discussing without patch is not very good. please post your patch.
Then we can discuss more concrete things.
-Kame
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