Re: VM in 2.4.10(+tweaks) vs. 2.4.9-ac14/15(+stuff)

[Andrea Arcangeli]

On Wed, Sep 26, 2001 at 11:23:44AM -0300, Rik van Riel wrote:
> On Wed, 26 Sep 2001, Andrea Arcangeli wrote:
> > On Wed, Sep 26, 2001 at 06:38:48AM -0700, Craig Kulesa wrote:
> > > in memory, and is swapping out harder to compensate.  The ac14/ac15 tree
> >
> > 2.4.10 is swapping out more also because I don't keep track of which
> > pages are just uptodate on the swap space. This will be fixed as soon
> > as I teach get_swap_page to collect away from the swapcache mapped
> > exclusive swap pages.
> 
> Wouldn't that be easier to do from try_to_swap_out() ?

Of course that's a possibility but then we'd have to duplicate it in all
other get_swap_page callers, see?

And I think it much better fits hided in get_swap_page: the semantics of
get_swap_page() are "give to the caller a newly allocated swap entry".
So IMHO it is its own business to discard our "optimizations" to
generate a free swap entry in case all swap was just allocated.

Andrea