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

[Andrew Morton]

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