linux-kernel - Re: [RFC 0/5] percpu: Optimize percpu accesses

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Message-ID: <20080701150313.GA30476@elte.hu>
Date:	Tue, 1 Jul 2008 17:03:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/5] percpu: Optimize percpu accesses


* Ingo Molnar <mingo@...e.hu> wrote:

> > This patchset provides the following:
> > 
> >   * Cleanup: Fix early references to cpumask_of_cpu(0)
> >   * Generic: Percpu infrastructure to rebase the per cpu area to zero
> >   * x86_64: Fold pda into per cpu area
> >   * x86_64: Rebase per cpu variables to zero
> 
> thanks Mike - i've started testing it in -tip. One small merge fallout 
> fix is below. (it's for the new generic-ipi topic that was not in 
> tip/master yet when you merged percpu-zerobased to it)

ok, -tip testing found an early boot crash caused by your patchset, on 
64-bit x86:

[    0.396000] calling  net_ns_init+0x0/0x143
[    0.400000] net_namespace: 944 bytes
[    0.403578] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[    0.404000] IP: [<ffffffff80e05b0e>] net_ns_init+0x9f/0x143
[    0.404000] PGD 0
[    0.404000] Oops: 0000 [1] SMP
[    0.404000] CPU 0
[...]

full bootlog and config can be found at:

  http://redhat.com/~mingo/misc/crashlog-Tue_Jul__1_16_48_45_CEST_2008.bad
  http://redhat.com/~mingo/misc/config-Tue_Jul__1_16_48_45_CEST_2008.bad

(another 64-bit testbox crashed as well, so this should be readily 
reproducible.)

i've pushed this tree out to tip/tmp.core/percpu-zerobased.Jul__1_16_48 
topic branch, that is the 2.6.26-rc8-tip-00250-g90874b0 kernel you can 
see in the crashlog.

	Ingo
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