Re: Page cache and swapping
Bernd Schmidt (crux@Pool.Informatik.RWTH-Aachen.DE)
Fri, 27 Jun 1997 13:30:21 +0200 (MET DST)
> I'm very grateful for all comments about problems with freeing shared
> memory. I have still no answer to the question about removing the
> page cache page from processes page table, if page->count=1.
> Does it mean that informations in mm.h are wrong and page->count=1
> for pages, which do not belong to any process and are still in the
> page cache (the swapping mechanism sets the present bit in the page table
> to zero and the page still remains in memory)?
When page->count == 1 for a page cache page, this means that it is not in
any process page table. The count is incremented once just for recording that
the page is in the page cache.
Bernd