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From: Nick Piggin <>
To: Lee Schermerhorn <>
Cc: Linux Kernel Mailing List <>,
	Linux Memory Management List <>
Subject: Re: [patch] mm: NUMA replicated pagecache
Date: Fri, 16 Feb 2007 14:35:46 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <1171582169.5114.86.camel@localhost>

On Thu, Feb 15, 2007 at 06:29:29PM -0500, Lee Schermerhorn wrote:
> I've attached another patch that closes one race and fixes a context
> problem [irq/preemption state] in __unreplicate_page_range().  This
> makes the locking even uglier :-(.
> I get further with this patch.  Boot all the way up and can run fine
> with page replication.  However, I still get a NULL pcd in
> find_get_page_readonly() when attempting a highly parallel kernel build
> [16cpu/4node numa platform].  I'm still trying to track that down.

OK, before you get further with your testing, I have done a rework. Sorry
you had to wade through that last lot of uncommented spaghetti. This
upcoming version should actually be a reasonable base to do testing and
development on.

> Question about locking:  looks like the pcache_descriptor members are
> protected by the tree_lock of the mapping, right?

Yes. I figured that this would be cleanest and simplest for now. This
locking model is retained in the rework.


      reply	other threads:[~2007-02-16 13:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-13  6:09 Nick Piggin
2007-02-13  6:09 ` Nick Piggin
2007-02-14  4:28 ` Nick Piggin
2007-02-14 18:57 ` Christoph Lameter
2007-02-15  0:07   ` Nick Piggin
2007-02-14 19:00 ` Christoph Lameter
2007-02-15  0:10   ` Nick Piggin
2007-02-15  0:13     ` Christoph Lameter
2007-02-14 20:32 ` Lee Schermerhorn
2007-02-15  0:38   ` Nick Piggin
2007-02-15 23:29     ` Lee Schermerhorn
2007-02-16 13:35       ` Nick Piggin [this message]

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