linux-kernel - Re: [MAINTAINER SUMMIT] Folios as a potential Kernel/Maintainers Summit topic?

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Date:   Wed, 15 Sep 2021 15:15:13 -0400
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Chris Mason <clm@...com>, Theodore Ts'o <tytso@....edu>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>,
        "ksummit@...ts.linux.dev" <ksummit@...ts.linux.dev>
Subject: Re: [MAINTAINER SUMMIT] Folios as a potential Kernel/Maintainers
 Summit topic?

On Wed, 2021-09-15 at 18:41 +0000, Chris Mason wrote:
> > On Sep 15, 2021, at 2:20 PM, Theodore Ts'o <tytso@....edu> wrote:
> > 
> > On Wed, Sep 15, 2021 at 02:03:46PM -0400, James Bottomley wrote:
> > > On Wed, 2021-09-15 at 13:42 -0400, Theodore Ts'o wrote:
> > > [...]
> > > > Would this be helpful?  (Or Linus could pull either the folio
> > > > or pageset branch, and make this proposal obsolete, which would
> > > > be great.  :-)
> > > 
> > > This is a technical rather than process issue isn't it?  You
> > > don't have enough technical people at the Maintainer summit to
> > > help meaningfully.  The ideal location, of course, was LSF/MM
> > > which is now not happening.
> > > 
> > > However, we did offer the Plumbers BBB infrastructure to willy
> > > for a MM gathering which could be expanded to include this.
> > 
> > Well, that's why I was suggesting doing this as a LPC BOF, and
> > using an LPC BOF session on Friday --- I'm very much aware we don't
> > have the right tehcnical people at the Maintainer Summit.
> > 
> > It's not clear we will have enough MM folks at the LPC, and I agree
> > LSF/MM would be a better venue --- but as you say, it's not
> > happening. We could also use the BBB infrastructure after the LPC
> > as well, if we can't get everyone lined up and available on short
> > notice.  There are a lot of different possibilities; I'm for
> > anything where all of the stakeholders agree will work, so we can
> > make forward progress.
> 
> I think the two different questions are:
> 
> * What work is left for merging folios?

My reading of the email threads is that they're iterating to an actual
conclusion (I admit, I'm surprised) ... or at least the disagreements
are getting less.  Since the merge window closed this is now a 5.16
thing, so there's no huge urgency to getting it resolved next week.

> * What process should we use to make the overall development of folio
> sized changes more predictable and rewarding for everyone involved?

Well, the current one seems to be working (admittedly eventually, so
achieving faster resolution next time might be good) ... but I'm sure
you could propose alternatives ... especially in the time to resolution
department.

James