Re: Large slab cache in 2.6.1

[Nick Piggin]

Andrew Morton wrote:

> Nick Piggin <piggin@xxxxxxxxxxxxxxx> wrote:
>
> > > yep.
> > Yeah this is good. I thought the patch you were proposing was
> > to shrink slab on highmem pressure.
>
> That as well.

Well this is the complexity I'm talking about. Sure it
is actually "simpler" code wise, but you're making it
conceptually more complex.

> > Apply some lowmem pressure due to highmem pressure THEN shrink
> > slab as a result of the lowmem pressure is much better.
>
> Prove it to me ;)

Your slab wasn't being shrunk because the slab pressure
calculation was way off for highmem systems. My patch fixed
that, so lowmem pressure should shrink slab properly.

Then with your patch, highmem pressure will apply lowmem
pressure. So the end result is that the slab gets appropriate
pressure.

Can't you just prove to me why that doesn't work? ;)

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