From: Ingo Molnar <mingo@elte.hu>
To: Mike Travis <travis@sgi.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Christoph Lameter <cl@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC 0/5] percpu: Optimize percpu accesses
Date: Tue, 1 Jul 2008 17:03:13 +0200 [thread overview]
Message-ID: <20080701150313.GA30476@elte.hu> (raw)
In-Reply-To: <20080701145417.GB18522@elte.hu>
* Ingo Molnar <mingo@elte.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
next prev parent reply other threads:[~2008-07-01 15:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-01 12:16 [RFC 0/5] percpu: Optimize percpu accesses Mike Travis
2008-07-01 12:16 ` [RFC 1/5] x86_64: Fix early references to cpumask_of_cpu Mike Travis
2008-07-01 12:16 ` [RFC 2/5] x86_64: Fold pda into per cpu area Mike Travis
2008-07-01 12:16 ` [RFC 3/5] x86_64: Reference zero-based percpu variables offset from gs Mike Travis
2008-07-01 12:16 ` [RFC 4/5] x86_64: Replace cpu_pda ops with percpu ops Mike Travis
2008-07-01 12:16 ` [RFC 5/5] x86_64: Replace xxx_pda() operations with x86_xxx_percpu() Mike Travis
2008-07-01 14:54 ` [RFC 0/5] percpu: Optimize percpu accesses Ingo Molnar
2008-07-01 15:03 ` Ingo Molnar [this message]
2008-07-01 15:07 ` Mike Travis
2008-07-02 14:04 ` Mike Travis
2008-07-18 6:52 ` Ingo Molnar
2008-07-01 18:47 ` Mike Travis
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