Re: [PATCH 3/7] slub: Do not use c->page on free

[Jesper Dangaard Brouer]

On Tue, 16 Dec 2014 08:53:08 -0600 (CST)
Christoph Lameter <cl@xxxxxxxxx> wrote:

> On Tue, 16 Dec 2014, Joonsoo Kim wrote:
> 
> > > Like this:
> > >
> > >         return d > 0 && d < page->objects * s->size;
> > >
> >
> > Yes! That's what I'm looking for.
> > Christoph, how about above change?
> 
> Ok but now there is a multiplication in the fast path.

Could we pre-calculate the value (page->objects * s->size) and e.g store it
in struct kmem_cache, thus saving the imul ?

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer
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