Re: [PATCH 4/6] dax: Use PAGE_CACHE_SIZE where appropriate

[Matthew Wilcox]

On Mon, Feb 01, 2016 at 03:10:19PM +0200, Kirill A. Shutemov wrote:
> On Sun, Jan 31, 2016 at 11:19:53PM +1100, Matthew Wilcox wrote:
> > We were a little sloppy about using PAGE_SIZE instead of PAGE_CACHE_SIZE.
> 
> PAGE_CACHE_SIZE is non-sense. It never had any meaning. At least in
> upstream. And only leads to confusion on border between vfs and mm.
> 
> We should just drop it.
> 
> I need to find time at some point to prepare patchset...

I argued in favour of this at last LSFMM and people were ... reluctant.
I think with your map_pages work, the PAGE_CACHE_SIZE idea now has no
potential performance win left.