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

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Message-ID: <20070214042843.GD7125@wotan.suse.de>
Date:	Wed, 14 Feb 2007 05:28:43 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	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, Feb 13, 2007 at 07:09:24AM +0100, Nick Piggin wrote:
> 
> Issues:
> - Not commented. I want to change the interfaces around anyway.
> - Breaks filesystems that use filemap_nopage, but don't call filemap_mkwrite
>   (eg. XFS). Fix is trivial for most cases.
> - Haven't tested NUMA yet (only tested via a hack to do per-CPU replication)
> - Would like to be able to control replication via userspace, and maybe
>   even internally to the kernel.
> - Ideally, reclaim might reclaim replicated pages preferentially, however
>   I aim to be _minimally_ intrusive.
> - Would like to replicate PagePrivate, but filesystem may dirty page via
>   buffers. Any solutions? (currently should mount with 'nobh').

Hmm, I guess we should be able to do this for pagecache of regular files,
as filesystems should not have any business dirtying that.
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