Re: [PATCH 14/14] mm, netfs, fscache: Stop read optimisation when folio removed from pagecache

From: Matthew Wilcox
Date: Mon Apr 25 2022 - 08:30:21 EST

On Mon, Apr 25, 2022 at 01:07:41PM +0100, David Howells wrote:
> Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
> > OK. You suggested that releasepage was an acceptable place to call it.
> > How about we have AS_RELEASE_ALL (... or something ...) and then
> > page_has_private() becomes a bit more complicated ... to the point
> > where we should probably get rid of it (by embedding it into
> > filemap_release_folio():
> I'm not sure page_has_private() is quite so easy to get rid of.
> shrink_page_list() and collapse_file(), for example, use it to conditionalise
> a call to try_to_release_page() plus some other bits.

That's what I was saying. Make the calls to try_to_release_page()
unconditional and delete page_has_private() because it only confuses
people who should actually be using PagePrivate().

> I think that, for the moment, I would need to add a check for AS_RELEASE_ALL
> to page_has_private().
> David