linux-kernel - Re: [GIT PULL] SLAB changes for v2.6.39-rc1

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Message-ID: <alpine.DEB.2.00.1103241300420.32226@router.home>
Date:	Thu, 24 Mar 2011 13:01:50 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, tj@...nel.org, npiggin@...nel.dk,
	rientjes@...gle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [GIT PULL] SLAB changes for v2.6.39-rc1

On Thu, 24 Mar 2011, Pekka Enberg wrote:

> On Thu, Mar 24, 2011 at 7:43 PM, Christoph Lameter <cl@...ux.com> wrote:
> > The bug should only trigger on old AMD64 boxes that do not support
> > cmpxchg16b.
>
> Yup. Ingo is it possible to see /proc/cpuinfo of one of the affected
> boxes? I'll try your config but I'm pretty sure the problem doesn't
> trigger here. Like I said, I think the problem is that alternative
> instructions are not patched early enough for cmpxchg16b emulation to
> work for kmem_cache_init(). I tried my check_bugs() patch but it hangs
> during boot. I'll see if I can cook up a patch that does
> alternative_instructions() before kmem_cache_init() because I think
> those *should* be available during boot too.

I forced the fallback to the _emu function to occur but could not trigger
the bug in kvm.

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