linux-kernel - Re: [PATCHv6 00/22] Transparent huge page cache: phase 1, everything but mmap()

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Message-Id: <20130924163740.4bc7db61e3e520798220dc4c@linux-foundation.org>
Date:	Tue, 24 Sep 2013 16:37:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, Dave Hansen <dave@...1.net>,
	Ning Qu <quning@...gle.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 00/22] Transparent huge page cache: phase 1,
 everything but mmap()

On Mon, 23 Sep 2013 15:05:28 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:

> It brings thp support for ramfs, but without mmap() -- it will be posted
> separately.

We were never going to do this :(

Has anyone reviewed these patches much yet?

> Please review and consider applying.

It appears rather too immature at this stage.

> Intro
> -----
> 
> The goal of the project is preparing kernel infrastructure to handle huge
> pages in page cache.
> 
> To proof that the proposed changes are functional we enable the feature
> for the most simple file system -- ramfs. ramfs is not that useful by
> itself, but it's good pilot project.

At the very least we should get this done for a real filesystem to see
how intrusive the changes are and to evaluate the performance changes.


Sigh.  A pox on whoever thought up huge pages.  Words cannot express
how much of a godawful mess they have made of Linux MM.  And it hasn't
ended yet :( My take is that we'd need to see some very attractive and
convincing real-world performance numbers before even thinking of
taking this on.



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