Re: [RFC] Optimization for use-once pages

[Daniel Phillips]

On Wednesday 25 July 2001 18:41, Rik van Riel wrote:
> On Wed, 25 Jul 2001, Daniel Phillips wrote:
> > On Wednesday 25 July 2001 08:33, Marcelo Tosatti wrote:
> > > Now I'm not sure why directly adding swapcache pages to the
> > > inactive dirty lits with 0 zero age improves things.
> >
> > Because it moves the page rapidly down the inactive queue towards
> > the ->writepage instead of leaving it floating around on the active
> > ring waiting to be noticed.  We already know we want to evict that
> > page,
>
> We don't.
>
> The page gets unmapped and added to the swap cache the first
> time it wasn't referenced by the process.
>
> This is before any page aging is done.

True, it's more accurate to say that we already know we want to *try* 
evicting that page.  A wrong guess should not make it all the way down 
the inactive queue.

--
Daniel