Re: [RFC/PATCH 3/3] SLOB: make ksize() more strict for page allocatorpass-through

From: Christoph Lameter
Date: Wed May 21 2008 - 17:14:52 EST

On Wed, 21 May 2008, Pekka Enberg wrote:

> Matt Mackall wrote:
> > We already know users (ie nommu memory usage reporting) are abusing this
> > interface. Making them blow up is unnecessary. Just give them wrong
> > answers. Issuing a warning might be a good idea for debugging.
> But kobjsize() never calls ksize() with SLOB as it doesn't set PageSlab. Or
> are you talking about something else here?
> Matt Mackall wrote:
> > Second, I'd prefer to keep this sort of debugging code out of SLOB.
> > SLUB is much better suited to debugging allocator abuse.
> Fair enough. I'll drop the patch.

I also would prefer to keep this out of SLUB. Set/Clear PageSlab dirties
the cacheline and it forces the unlining of kmalloc_large.

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