Thanks for the fast response - I appreciate it! >> >> - I’ve seen folios for anon memory listed as future work; what’s the current >> status? Is anyone looking at this? It’s something that I would be interested to >> take a look at if not (although don’t take that as an actual commitment yet!). > > There are definitely people _looking_ at it. I don't think anyone's > committed to it, and I don't think there's anyone 50 patches into a 100 > patch series to make it work ;-) I think there are a lot of unanswered > questions about how best to do it. Is there any list outlining those questions? Having had a quick look at do_anonymous_page(), which is where a bunch of my overheads seem to be coming in, (and having the luxury of not being intimately familiar with mm ;-) ) it looks like it would be doable to convert it to allocate order-2 folios, for example. I guess a lot of the difficulty is in figuring out heuristics for choosing the right folio size for a given fault? And then thinking about handing COW, swap, parallel faults, etc? > I don't want you to get the impression that all the work going on is > targetted at filesystem folios. There's a lot of infrastructure that's > being converted from pages to folios and being reexamined at the same > time to be sure it handles arbitrary-order folios correctly. Right > now, I'm working on the architecture support for inserting multiple > consecutive PTEs at the same time: > https://lore.kernel.org/linux-arch/20230211033948.891959-1-willy@xxxxxxxxxxxxx/ Yep - I'm aware of that, thanks! > > Thanks for reaching out. We have a Zoom call on alternate Fridays, > so if you're free at 5pm UK time (yes, I know ... trying to fit in both > California and central Europe leads to awkward times for phone calls), > I can send you the meeting details. Yes, I'd be keen to join, although not the easiest time for me. I can't do this week, but would like to join on an ad-hoc basis if that's ok? When is the next call? Thanks, Ryan IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
