Reclaiming vnodes

[Adam Hamsik <haaaad%gmail.com@localhost>]

Hi,

I have written patch which changes way how are vnodes reclaimed.  
Current situation is that vnodes are reclaimed from free list in  
getnewvnode routine. Getnewvnode tries to find used vnode in free list  
and it is sucesfull it recycle it. I would like to change this  
behaviour. I have added new kernel thread called vreclaim which takes  
care about vnode reclaiming. My patch changes getnewvnode to always do  
vnalloc and do not care about vnode recycling. Vreclaim thread uses  
two values to determine if it should start reclaiming vnodes from free  
list.

int vreclaim_hiwat;
int vreclaim_lowat;

These numbers are computed from sysctl nodes vnodes_num_hiwat/ 
vnodes_num_lowat which can be set by user. Default is hiwat = 99% and  
lowat = 95%.


Any comments ?

[1] www.netbsd.org/~haad/vreclaim.diff

Regards

Adam.