Re: [QUICKLIST 1/5] Quicklists for page table pages V3

[Andrew Morton]

On Mon, 19 Mar 2007 16:57:55 -0700 (PDT)
Christoph Lameter <clameter@xxxxxxx> wrote:

> On Mon, 19 Mar 2007, Andrew Morton wrote:
> 
> > Has it been proven that quicklists are superior to simply going direct to the
> > page allocator for these pages?
> 
> Yes.

Sigh.

Please provide proof that quicklists are superior to simply going direct to
the page allocator for these pages.

> > Would it provide a superior solution if we were to a) stop zeroing out the
> > pte's when doing a fullmm==1 teardown and b) go direct to the page allocator
> > for these pages?
> 
> I doubt it. The zeroing is a by product of our way of serializing pte 
> handling. Its going to be difficult to change that.

Nick didn't think so, and I don't see the problem either.

We'll save on some bus traffic by avoiding the writeback, but how much
effect that will have we don't know.  Presumably little.

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