Re: Best way to extend try_to_free_pages()?

[Rik van Riel <riel@conectiva.com.br>]

On Wed, 17 May 2000, Andreas Bombe wrote:

> (not possible, since 1394 code can be modularized)?  If not, I
> consider adding some generic code to register callbacks for low
> memory situations as soon as I need it.

A callback system from do_try_to_free_pages(), where anybody
can dynamically register their cache->drop_pages() function
would be nice.

Maybe a list of caches with function pointers?

spin_lock(&cachelist_lock);
for (cache = &cachelist.next ; cache->next != &cachelist  ;
			 cache = cachelist->next) {
	count -= cache->drop_pages(priority);
	if (count <= 0)
		break;
}
spin_unlock(&cachelist_lock);


On module load time, init_module() could grab the cachelist_lock,
insert an entry in the list and next time try_to_free_pages() is
called our cache will be shrunk too.

regards,

Rik
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