On Tue, 2023-10-03 at 01:45 -0500, Haitao Huang wrote: > > > > Btw, probably a dumb question: > > > > Theoretically if you only need to find a victim enclave you don't need > > to put VA > > pages to the unreclaimable list, because those VA pages will be freed > > anyway > > when enclave is killed. So keeping VA pages in the list is for > > accounting all > > the pages that the cgroup is having? > > Yes basically tracking them in cgroups as they are allocated. > > VAs and SECS may also come and go as swapping/unswapping happens. But if a > cgroup is OOM, and all reclaimables are gone (swapped out), it'd have to > reclaim VAs/SECs in the same cgroup starting from the front of the LRU > list. To reclaim a VA/SECS, it identifies the enclave from the owner of > the VA/SECS page and kills it, as killing enclave is the only way to > reclaim VA/SECS pages. To kill enclave you just need to track SECS in the unreclaimable list. Only when you want to account the total EPC pages via some list you _probably_ need to track VA as well. But I am not quite sure about this either.
