linux-kernel - Re: [PATCH] Revert "x86: optimize page faults like all other achitectures and kill notifier cruft"

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Message-ID: <20080109152640.GA21909@elte.hu>
Date:	Wed, 9 Jan 2008 16:26:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...e.de>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Dave Airlie <airlied@...ux.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, hch@....de, pq@....fi,
	jbeulich@...ell.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "x86: optimize page faults like all other
	achitectures and kill notifier cruft"


* Andi Kleen <ak@...e.de> wrote:

> On Wed, Jan 09, 2008 at 07:18:46AM -0800, Arjan van de Ven wrote:
> > On Wed, 9 Jan 2008 03:17:37 +0000 (GMT)
> > Dave Airlie <airlied@...ux.ie> wrote:
> > 
> > > So all distros with 2.6.24 kernels are useless to mmiotrace I don't
> > > see why leaving things as is until a suitable replacement mechanism
> > > can be used.. 
> > 
> > you work for a distro.. surely you can convince your own distro to 
> > carry this patch for one release? Maybe if it's this important.. so 
> > can the others...
> 
> But if it's good for a major distribution why is it not good for 
> mainline?

it's a bit too late to get the out-of-tree module into v2.6.24, and the 
revert makes little sense without the extra out-of-tree module. We at a 
minimum need a clear explanation of why this functionality cannot be 
provided via kprobes/systemtap.

> We had this discussion at last kernel summit and the answer was clear.

it's a clear answer 1 week after the merge window opens, but not 1 week 
before the next stable kernel is released.

	Ingo
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