linux-kernel - Re: [patch 1/2] mm: dont clear PG_uptodate in invalidate_complete

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Date:	Tue, 8 Jul 2008 12:22:07 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	jamie@...reable.org, torvalds@...ux-foundation.org,
	jens.axboe@...cle.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, hugh@...itas.com
Subject: Re: [patch 1/2] mm: dont clear PG_uptodate in invalidate_complete_page2()

On Tuesday 08 July 2008 01:08, Miklos Szeredi wrote:
> On Tue, 8 Jul 2008, Nick Piggin wrote:

> > > Well, other than my original proposal, which would just have reused
> > > the do_generic_file_read() infrastructure for splice.  I still don't
> > > see why we shouldn't use that, until the whole async splice-in thing
> > > is properly figured out.
> >
> > Given the alternatives, perhaps this is for the best, at least for
> > now.
>
> Yeah.  I'm not at all opposed to improving splice to be able to do all
> sorts of fancy things like async splice-in, and stealing of pages.
> But it's unlikely that I will have the motivation to implement any of
> them just to fix this bug.

Yeah. Well then, would you mind having another cut at the patch to
do that? I guess it might help if you don't remove the ->confirm
code -- after fixing the bug then we could discuss what to do with
that code and how we could implement async.

I guess it would be nice to find something that gets a lot of
benefit with the async splicing. Luckily the existing scheme is
workable enough that it would be easy to test a hunch just by
patching it back in...
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