From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Andrew Morton <akpm@osdl.org>
Cc: npiggin@suse.de, Paul.McKenney@us.ibm.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch 0/3] 2.6.17 radix-tree: updates and lockless
Date: Wed, 21 Jun 2006 09:50:28 +1000 [thread overview]
Message-ID: <1150847428.1901.60.camel@localhost.localdomain> (raw)
In-Reply-To: <20060620163037.6ff2c8e7.akpm@osdl.org>
On Tue, 2006-06-20 at 16:30 -0700, Andrew Morton wrote:
> > leave the bug in ppc64 or kill it's scalability
> > when taking interrupts ? You have one user already, me.
>
> I didn't know that 30 minutes ago ;)
Heh, I though I wrote that when I originally asked Nick to bring back
his patch up to date :) Bah, anyway, you know now.
> > From what Nick
> > says, the patch has been beaten up pretty heavily and seems stable....
>
> Well as I say, the tree_lock crash is way more important. We need to work
> out what we're going to do then get that fixed, backport the fix to -stable
> then rebase the radix-tree patches on top and get
> radix-tree-rcu-lockless-readside.patch tested and reviewed.
>
> I guess we can do all that in time for -rc1, but not knowing _how_ we'll be
> fixing the tree_lock crash is holding things up.
Ok.
> Paul, if you could take a close look at the RCU aspects of this work it'd
> help, thanks.
>
> btw guys, theory has it that code which was submitted post-2.6.n is too
> late for 2.6.n+1..
Yes but the lockless radix tree patch was floating around a long time
ago :)
Anyway, I can drop a spinlock in (in fact I have) the ppc64 irq code for
now but that sucks, thus we should really seriously consider having the
lockless tree in 2.6.18 or I might have to look into doing an alternate
implementation specifically in arch code... or find some other way of
doing the inverse mapping there...
Ben.
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next prev parent reply other threads:[~2006-06-20 23:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-20 14:48 [patch 0/3] 2.6.17 radix-tree: updates and lockless Nick Piggin
2006-06-20 14:48 ` [patch 1/3] radix-tree: direct data Nick Piggin
2006-06-20 14:48 ` [patch 2/3] radix-tree: small Nick Piggin
2006-06-20 14:48 ` [patch 3/3] radix-tree: RCU lockless readside Nick Piggin
2006-06-22 1:49 ` Paul E. McKenney
2006-06-22 15:45 ` Nick Piggin
2006-06-22 16:30 ` Paul E. McKenney
2006-06-22 16:55 ` Nick Piggin
2006-06-22 17:40 ` Paul E. McKenney
2006-06-22 18:11 ` Nick Piggin
2006-06-23 7:09 ` Andrew Morton
2006-06-23 8:03 ` Nick Piggin
2006-06-23 8:39 ` Nick Piggin
2006-06-23 8:41 ` Nick Piggin
2006-06-20 22:08 ` [patch 0/3] 2.6.17 radix-tree: updates and lockless Benjamin Herrenschmidt
2006-06-20 22:35 ` Andrew Morton
2006-06-20 23:09 ` Benjamin Herrenschmidt
2006-06-20 23:30 ` Andrew Morton
2006-06-20 23:50 ` Benjamin Herrenschmidt [this message]
2006-06-21 0:34 ` Christoph Lameter
2006-06-21 0:47 ` Benjamin Herrenschmidt
2006-06-21 1:07 ` Christoph Lameter
2006-06-21 1:33 ` Benjamin Herrenschmidt
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