Re: How to reclaim inode pages on demand

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On 8/11/05, Andrew Morton <[email protected]> wrote:
> Magnus Damm <[email protected]> wrote:
> >
> > On 8/11/05, Andrew Morton <[email protected]> wrote:
> > > Mel Gorman <[email protected]> wrote:
> > > > The majority of pages I am seeing no longer have page->mapping set. Does
> > > > this mean they are in the process of being cleared up?
> > >
> > > They're just anonymous pages, aren't they?  But you said "pages that are
> > > being used for inodes".  Confused.
> >
> > I thought page->mapping was used by rmap for both inode-backed and
> > anonymous pages. And the PAGE_MAPPING_ANON bit was used to determine
> > that page->mapping points to struct anon_vma instead of struct
> > address_space.
> >
> > When is page->mapping NULL?
> >
> mm.h:page_mapping() handles all that.

Yes, thanks, but I believe that page->mapping is never NULL for
anonymous pages. Does not all anonymous pages have page->mapping
pointing to struct anon_vma?

/ magnus
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