linux-kernel - Re: [PATCH 0/3] fs, mm: get rid of PAGE_CACHE_* and page_cache

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160321163404.GA141069@black.fi.intel.com>
Date:	Mon, 21 Mar 2016 19:34:04 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 0/3] fs, mm: get rid of PAGE_CACHE_* and
 page_cache_{get,release} macros

On Mon, Mar 21, 2016 at 11:25:09AM -0500, Christoph Lameter wrote:
> 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?

Err?.. What?

We do have anon-THP pages on LRU. My huge tmpfs patchset also put
file-THPs on LRU list.

The patchset has nothing to do with THP or them being on 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.

Sorry, I failed to understand your message.

Look on huge tmpfs patchset. It allows both small and huge pages in page
cache.

Anyway, it's out of scope of the patchset.

-- 
 Kirill A. Shutemov