On Saturday, February 8, 2020 8:33 PM, Tetsuo Handa wrote: > > Is this NUMA aware? Can "node-A's NR_FILE_PAGES is already 0 and > node-B's NR_FILE_PAGES is not 0, but allocation request which triggered this > shrinker wants to allocate from only node-B" happen?
No, it's a global counter. >Can some thread keep > this shrinker defunctional by keep increasing NR_FILE_PAGES? Yes. Actually it's our intention - as long as there are pagecache pages, balloon pages are avoided to be reclaimed. > > Is this patch from "Re: Balloon pressuring page cache" thread? I hope that > the guest could start reclaiming memory based on host's request (like OOM > notifier chain) which is issued when host thinks that host is getting close to > OOM and thus guests should start returning their unused memory to host. > Maybe "periodically (e.g. 5 minutes)" in addition to "upon close to OOM > condition" is also possible. That's about the host usages. The host side management software decides when to issue a request to balloon (either periodically or event driven), I think there isn't anything we need to do in the balloon driver here. Best, Wei _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
