Re: Fairness in love and swapping

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

On Wed, 25 Feb 1998, Dr. Werner Fink wrote:

> > all remained fresh in the page age table.  The newcomer processes were
> > never able to keep a page in memory long enough for their age to compete
> > with the old process' pages, and so I had a number of identical
> > processes, half of which were fully swapped in and half of which were
> > swapping madly.
> 
>         /* Give the physical reallocated page a bigger start */
>         if (vma->vm_mm->rss < (MAP_NR(high_memory) >> 2))
>                 mem_map[MAP_NR(page)].age = (PAGE_INITIAL_AGE + PAGE_ADVANCE);
> 
> 
> would help a bit.  With this few lines a recently swapin page gets a bigger
> start by increasing the page age ... but only if the corresponding process to
> not overtake the physical memory.  This change is not very smart (e.g. its not
> a real comparsion by process swap count or priority) ... nevertheless it works
> for 2.0.33.

It looks kinda valid, and I'll try and tune it RSN. If
it gives any improvement, I'll send it to Linus for
inclusion.

Rik.
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