Date: Fri, 25 Jul 2014 10:23:31 +1000 from: matthew green <m...@eterna.com.au>
"Taylor R Campbell" writes: > Add a FIRST1G page freelist to x86, for old graphics devices. other devices that do this didn't have to change the platform code to do it. see bce(4), which is limited to 1GB of ram on laptops that have 2GB. Yes...but those can just use bus_dmamem_alloc, which in turn can use uvm_pglistalloc. The graphics devices need to constrain the pages allocated for uvm objects, which use uvm_pagealloc. I proposed a patch to allow configuring uao to allocate pages with uvm_pglistalloc instead: https://mail-index.netbsd.org/tech-kern/2014/05/20/msg017092.html matt@ objected and suggested using page freelists instead, so I did that. Nobody on port-x86 objected to the page freelist code I added: https://mail-index.netbsd.org/port-amd64/2014/05/21/msg002062.html https://mail-index.netbsd.org/port-i386/2014/05/21/msg003277.html So this week I asked about making the mechanism for choosing a suitable page freelist a MI interface: https://mail-index.netbsd.org/tech-kern/2014/07/22/msg017391.html I would like to nail this down pronto so that we have a chance to pull up graphics fixes to netbsd-7 without having to bring in whole new bus_dma gizmos. I don't care how it works -- I just want some MI way to demand that the pages allocated for a uao be fit for bus_dma, whether it be by page freelists or uvm_pglistalloc or something else altogether.
