On Mon, 29 Jan 2024 12:47:49 -0800 SeongJae Park <sj@xxxxxxxxxx> wrote: > Hi all, > > > Thanks to the discussions and feedback that we received last year from the > LSF/MM/BPF 2023's DAMON updates and future plans session[1], DAMON made many > advances and yet more future plans. I'd like to again share/discuss the > followup changes and status we made so far after the last year's session, and > the future development plans on LSF/MM/BPF 2024. > > A few topics would be shared, including below. > [...] > > Access/Contiguity-aware Memory Auto-scaling > ------------------------------------------- > > This is a new idea which was not discussed in last year's LSF/MM/BPF. The main > purpose is to implement an access-aware, efficient, reliable, and simple to use > memory over-subscribed VM guest kernels. Specifically, it will steal guest > memory based on access patterns in a contiguity-aware manner and report those > to the host as free to use. The PSI-based stealing aggressiveness auto-tuning > may be used. It will also apply a 'struct page' overhead reduction mechanism > to the stolen memory. We're currently thinking about memory hotplugging and > vmemmap remapping as candidate mechanisms. For simple usage, the interface > will be similar to that of virtio-balloon, which is widely adopted. The first > version of the more detailed idea[7] has been shared before. > > Because it is still at a pure idea level, not much progress until LSF/MM/BPF is > expected. This item would be primarily for the future plans part. That said, > at least a second version of the design will be shared before. Also hopefully > early proof-of-concepts level implementation or some test results will be > shared. Since this is expected to be more for future plans than status update, > I hope to have more discussions for getting design level concerns and possible > collaboration chances. I just posted the RFC IDEA v2 of this with pseudo-code level implementation example: https://lore.kernel.org/all/20240512193657.79298-1-sj@xxxxxxxxxx/ Hopefully it will help the idea success or fail faster :) Thanks, SJ [...]
