Re: [PATCH 0/3] fs, mm: get rid of PAGE_CACHE_* and page_cache_{get,release} macros

From: Christoph Lameter
Date: Mon Mar 21 2016 - 12:25:17 EST

On Mon, 21 Mar 2016, Kirill A. Shutemov wrote:

> PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago
> with promise that one day it will be possible to implement page cache with
> bigger chunks than PAGE_SIZE.
> This promise never materialized. And unlikely will.

So we decided that we are never going to put THP pages on a LRU? Will this
actually work if we have really huge memory (100s of TB) where almost
everything is a huge page? Guess we have to use hugetlbfs and we need to
think about this as being exempt from paging.