linux-kernel - Re: slub: Lockout validation scans during freeing of object

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Message-ID: <alpine.DEB.2.00.1111221319070.30368@router.home>
Date:	Tue, 22 Nov 2011 13:20:12 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Christian Kujau <lists@...dbynature.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Alex,Shi" <alex.shi@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: slub: Lockout validation scans during freeing of object

On Tue, 22 Nov 2011, Markus Trippelsdorf wrote:

> On 2011.11.22 at 11:40 -0600, Christoph Lameter wrote:
> > On Tue, 22 Nov 2011, Eric Dumazet wrote:
> >
> > > This seems better, but I still have some warnings :
> >
> > Trying to reproduce with a kernel configured to do preempt. This is
> > actually quite interesting since its always off by 1.
>
> BTW there are some obvious overflows in the "slabinfo -l" output on my machine:

Could you get me the value of the "slabs" field for the slabs showing the
wierd values. I.e. do

cat /sys/kernel/slab/signal_cache/slabs

> signal_cache               268     920   360.4K 18446744073709551614/7/24   17 2  31  68 A
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