Re: pageable page tables

[Rik van Riel <H.H.vanRiel@fys.ruu.nl>]

On Tue, 9 Dec 1997, Pavel Machek wrote:

> > > Simple task might be 'memory priorities'. Something like priorities
> > > for scheduler but for memory. (I tried to implement them, and they
> > > gave <1% performance gain ;-), but I have interface to set such
> > > parameter if you want to play).
> > 
> > sounds rather good... (swapout-priorities??)
> 
> But proved to be pretty ineffective. I came to this idea when I
> realized that to cook machine, running 100 processes will not hurt too
> much. But running 10 processes, 50 megabytes each will cook almost
> anything...

what about:

if (page->age - p->mem_priority)
	exit 0 / goto next;
else {
	get_rid_of(page);
	and_dont_show_your_face_again_for_some_time(page);
}

effectively putting the program to sleep if:
- this page faults again soon
- memory is still tight

hmm, just an idea...

Rik.

--
Send Linux memory-management wishes to me: I'm currently looking
for something to hack...