Re: [PATCH v3] mm: make expand_downwards symmetrical toexpand_upwards

[Matthew Wilcox]

On Wed, Apr 20, 2011 at 10:22:04AM -0500, Christoph Lameter wrote:
> There is barely any testing going on at all of this since we have had this
> issue for more than 5 years and have not noticed it. The absence of bug
> reports therefore proves nothing. Code inspection of the VM shows
> that this is an issue that arises in multiple subsystems and that we have
> VM_BUG_ONs in the page allocator that should trigger for these situations.

So ... we've proven that people using these architectures use SLAB
instead of SLUB, don't enable CONFIG_DEBUG_VM and don't use hugepages
(not really a surprise ... nobody's running Oracle on these arches :-)

I don't think that qualifies as "barely any testing".  I think that's
"nobody developing the Linux MM uses one of these architectures".

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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