linux-kernel - Re: 2.6.22 -mm merge plans: slub

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0705031011020.9826@blonde.wat.veritas.com>
Date:	Thu, 3 May 2007 10:15:55 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Christoph Lameter <clameter@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: 2.6.22 -mm merge plans: slub

On Thu, 3 May 2007, Andrew Morton wrote:
> On Thu, 3 May 2007 09:46:32 +0100 (BST) Hugh Dickins <hugh@...itas.com> wrote:
> > On Thu, 3 May 2007, Andrew Morton wrote:
> > > On Wed, 2 May 2007 10:25:47 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:
> > > 
> > > > +config ARCH_USES_SLAB_PAGE_STRUCT
> > > > +	bool
> > > > +	default y
> > > > +	depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
> > > > +
> > > 
> > > That all seems to work as intended.
> > > 
> > > However with NR_CPUS=8 SPLIT_PTLOCK_CPUS=4, enabling SLUB=y crashes the
> > > machine early in boot.  
> > 
> > I thought that if that worked as intended, you wouldn't even
> > get the chance to choose SLUB=y?  That was how it was working
> > for me (but I realize I didn't try more than make oldconfig).
> > 
> > That sounds like what happens when SLUB's pagestruct use meets
> > SPLIT_PTLOCK's pagestruct use.  Does your .config really show
> > CONFIG_SLUB=y together with CONFIG_ARCH_USES_SLAB_PAGE_STRUCT=y?
> 
> Nope.
> 
> g5:/usr/src/25> grep SLUB .config
> CONFIG_SLUB=y
> g5:/usr/src/25> grep SLAB .config
> # CONFIG_SLAB is not set
> g5:/usr/src/25> grep CPUS .config
> CONFIG_NR_CPUS=8
> # CONFIG_CPUSETS is not set
> # CONFIG_IRQ_ALL_CPUS is not set
> CONFIG_SPLIT_PTLOCK_CPUS=4
> 
> It's in http://userweb.kernel.org/~akpm/config-g5.txt

Seems we're all wrong in thinking Christoph's Kconfiggery worked
as intended: maybe it just works some of the time.  I'm not going
to hazard a guess as to how to fix it up, will resume looking at
the powerpc's quicklist potential later.

Hugh
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/