| From: |
| Andrew Morton <akpm-AT-linux-foundation.org> |
| To: |
| "Kirill A. Shutemov" <kirill.shutemov-AT-linux.intel.com> |
| Subject: |
| Re: [PATCHv6 00/22] Transparent huge page cache: phase 1, everything but mmap() |
| Date: |
| Tue, 24 Sep 2013 16:37:40 -0700 |
| Message-ID: |
| <20130924163740.4bc7db61e3e520798220dc4c@linux-foundation.org> |
| Cc: |
| Andrea Arcangeli <aarcange-AT-redhat.com>, Al Viro <viro-AT-zeniv.linux.org.uk>, Hugh Dickins <hughd-AT-google.com>, Wu Fengguang <fengguang.wu-AT-intel.com>, Jan Kara <jack-AT-suse.cz>, Mel Gorman <mgorman-AT-suse.de>, linux-mm-AT-kvack.org, Andi Kleen <ak-AT-linux.intel.com>, Matthew Wilcox <willy-AT-linux.intel.com>, "Kirill A. Shutemov" <kirill-AT-shutemov.name>, Hillf Danton <dhillf-AT-gmail.com>, Dave Hansen <dave-AT-sr71.net>, Ning Qu <quning-AT-google.com>, Alexander Shishkin <alexander.shishkin-AT-linux.intel.com>, linux-fsdevel-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org |
| Archive-link: |
| Article, Thread
|
On Mon, 23 Sep 2013 15:05:28 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.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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