linux-kernel - Re: [patch] mm: NUMA replicated pagecache

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Date:	Wed, 14 Feb 2007 10:57:00 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [patch] mm: NUMA replicated pagecache

On Tue, 13 Feb 2007, Nick Piggin wrote:

> Just tinkering around with this and got something working, so I'll see
> if anyone else wants to try it.
> 
> Not proposing for inclusion, but I'd be interested in comments or results.

We would be very interested in such a feature. We have another hack that 
shows up to 40% performance improvements.

> At the moment the code is a bit ugly, but it won't take much to make it a
> completely standalone ~400 line module with just a handful of hooks into
> the core mm. So if anyone really wants it, it could be quite realistic to
> get into an includable form.

Would be great but I am a bit skeptical regarding the locking and the 
additonal overhead moving back and forth between replications and non 
replicated page state.

> At some point I did take a look at Dave Hansen's page replication patch for
> ideas, but didn't get far because he was doing a per-inode scheme and I was
> doing per-page. No judgments on which approach is better, but I feel this
> per-page patch is quite neat.

Definitely looks better.

> - Would be nice to transfer master on reclaim. This should be quite easy,
>   must transfer relevant flags, and only if !PagePrivate (which reclaim
>   takes care of).

Transfer master? Meaning you need to remove the replicated pages? Removing 
of replicated pages should transfer reference bit?

> - Should go nicely with lockless pagecache, but haven't merged them yet.

When is that going to happen? Soon I hope?
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