svn commit: r267858 - in head/sys/dev: virtio/balloon xen/balloon

[Andriy Gapon]

On 25/06/2014 17:44, Attilio Rao wrote:
> Why? If VM needs more wired memory I assume that we can tune up the
> default value of max_wired?
> 
> I think that however your case makes an interesting point: if we want
> to make unmanaged pages as inherently wired, we likely need a little
> bit higher max_wired value. When I completed a patch for this, pho@
> couldn't reproduce any similar issue even with stress-testing (and
> also, the places to allocate unmanaged pages and not requesting
> VM_ALLOC_WIRED were very little, almost 0, with the exception of
> vm_page_alloc_contig() calls) but I think it is a valid proposition.
> 
> However I would still like to have more control on kernel-specific
> wired memory for processes. I'm for example thinking to ARC vs. buffer
> cache, where I expect the wired memory consumption to be much bigger
> for the former case.

My humble opinion is that userland page wiring should be tuned via
resource limits and that vm.max_wired could be retired altogether.
Kernel wiring ignores the knob anyway.

-- 
Andriy Gapon