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

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Message-ID: <843818E0-C7E8-451E-A5B1-DAF0F120BD5A@fb.com>
Date:   Thu, 14 Feb 2019 01:59:55 +0000
From:   Song Liu <songliubraving@...com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     "lsf-pc@...ts.linux-foundation.org" 
        <lsf-pc@...ts.linux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-raid <linux-raid@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [LSF/MM TOPIC] (again) THP for file systems



> On Feb 13, 2019, at 3:59 PM, Matthew Wilcox <willy@...radead.org> 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@infradead.org/
> 
> with particular reference to the last three paragraphs of
> https://lore.kernel.org/lkml/20190208042448.GB21860@bombadil.infradead.org/

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