Re: [PATCH] procfs: provide slub's /proc/slabinfo

Peter Zijlstra
2008-01-04T09:17:53Z

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On Fri, 2008-01-04 at 03:45 +0100, Andi Kleen wrote:
> > I still have trouble to see that SLOB still has much to offer. An embedded
> > allocator that in many cases has more allocation overhead than the default
> > one? Ok you still have advantages if allocations are rounded up to the
> > next power of two for a kmalloc and because of the combining of different
> > types of allocations in a single slab if there are an overall small number
> > of allocations. If one would create a custom slab for the worst problems
> > there then this may also go away.
>
> I suspect it would be a good idea anyways to reevaluate the power of two
> slabs. Perhaps a better distribution can be found based on some profiling?
> I did profile kmalloc using a systemtap script some time ago but don't
> remember the results exactly, but iirc it looked like it could be improved.

I remember wli trying to work out a series that had minimal
fragmentation. IIRC he was mixing a fibonaci series with the power of
two series.

Bill, do you remember getting anywhere?

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