Re: SLUB: The unqueued Slab allocator

KAMEZAWA Hiroyuki
2007-02-24T05:29:39Z

On Thu, 22 Feb 2007 10:42:23 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:

> > > G. Slab merging
> > >
> > > We often have slab caches with similar parameters. SLUB detects those
> > > on bootup and merges them into the corresponding general caches. This
> > > leads to more effective memory use.
> >
> > Did you do any tests on what that does to long term memory fragmentation?
> > It is against the "object of same type have similar livetime and should
> > be clustered together" theory at least.
>
> I have done no tests in that regard and we would have to assess the impact
> that the merging has to overall system behavior.
>
>From a viewpoint of a crash dump user, this merging will make crash dump
investigation very very very difficult.
So please avoid this merging if the benefit is nog big.

-Kame