Re: kern/55166: uvm_pdpolicy_clock params (anon/exec/file max/min) defaults

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Sat, Apr 11, 2020 at 04:40:00PM +0000, Izumi Tsutsui wrote:
> There parameters can be changed by sysctl(8), but initial values
> are hardcorded in uvmpdpol_init():

What about actually tuning the initial parameters on the amount of RAM
in the system? That seems much more sensible than hard-coding different
option sets in various kernels. It's not like it is going to add a lot
of (cold) code.

> Using the following sysctl vm values on dreamcast and x68k
> makes many applications (including twitter/mastodon clients)
> work as they can be used as demonstrations at conferences:
> ---
> vm.anonmax=30
> vm.anonmin=10
> vm.execmax=50
> vm.execmin=20
> vm.filemax=1
> vm.filemin=0

filemax seems questionable to me, the rest sound a useful default for
systems with <= 16MB RAM. 

Joerg