linux-kernel - Re: [PATCH 00/41] percpu: Consistent per cpu operations V1

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Date:	Wed, 4 Dec 2013 16:43:18 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Tejun Heo <tj@...nel.org>, akpm@...uxfoundation.org,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 00/41] percpu: Consistent per cpu operations V1

On Wed, 4 Dec 2013, Ingo Molnar wrote:

>
> * Christoph Lameter <cl@...ux.com> wrote:
>
> > The kernel has never been audited to ensure that this_cpu operations
> > are consistently used throughout the kernel. The code generated in
> > many places can be improved through the use of this_cpu operations
> > (which uses a segment register for relocation of per cpu offsets
> > instead of performing address calculations).
>
> Your series lacks the this_cpu ops preempt debugging patches that you
> worked on before, what happened to them?

They are included. Please read the complete description. Patches 13 14 and
18 implement the preemption checks.

> Those debug facilities caught kernel real bugs and they are thus
> essential before any percpu extension can be done.

Yes please apply the preemptiopn debug patches included in this series
ASAP.

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