Re: [LSF/MM TOPIC] (again) THP for file systems

[Song Liu]

> On Feb 13, 2019, at 3:59 PM, Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
> 
> On Wed, Feb 13, 2019 at 10:00:10PM +0000, Song Liu wrote:
>> I would like to discuss remaining work to bring THP to (non-tmpfs) file systems.
>> This topic has been discussed multiple times in previous LSF/MM summits [1][2].
>> However, there hasn't been much progress since late 2017 (the latest work I can
>> find is by Kirill A. Shutemov [3]).
> 
> ... this was literally just discussed.
> 
> Feel free to review
> https://lore.kernel.org/lkml/20190212183454.26062-1-willy@xxxxxxxxxxxxx/
> 
> with particular reference to the last three paragraphs of
> https://lore.kernel.org/lkml/20190208042448.GB21860@xxxxxxxxxxxxxxxxxxxxxx/

Thanks for the pointers! I will read the patches and related code.  

> 
>> Therefore, we would like discuss (for one more time) what is needed to bring
>> THP to file systems like ext4, xfs, btrfs, etc. Once we are aligned on the
>> direction, we are more than happy to commit time and resource to make it happen.
> 
> I believe the direction is clear.  It needs people to do the work.
> We're critically short of reviewers.  I got precious little review of
> the original XArray work, which made Andrew nervous and delayed its
> integration.  Now I'm getting little review of the followup patches
> to lay the groundwork for filesystems to support larger page sizes.
> I have very little patience for this situation.

I don't feel I am a qualified reviewer for MM patches, yet. But I will 
try my best to catch up. 

Thanks again,
Song