Re: 2.1.89 broken?

["Dr. Werner Fink" <werner@suse.de>]

> I've still got some Digital Unix-like balancing code
> lying around...
> Basically, you can set 3 values for the buffer/page
> cache, a minimum value, a maximum value and a steal
> value. When the buffer/page memory is above steal
> level and the system needs memory, it'll steal memory
> from the page cache first. A good default would be
> 25% of main memory. Of course, these values will be
> sysctl controllable (we still got 8 unused variables
> in swap_control ;-).

Does this mean that mm/filemap.c:shrink_mmap() would call
for it's self in mm/vmscan.c:kswapd() if the level is above
the limit?  ... without using mm/vmscan.c:(do_)try_to_free_page()
to become the buffer down without trashing the tasks?

This would need also a wrapper as it does for
do_try_to_free_page() to set/unset the kernel locks.

And this upper limit should be calculated dynamically because
there is a `small' difference between a 8Mb and a 512Mb
system ... the first systems should have a smaller amount
of buffer/cache to keep the system running :-)

           Werner