On 01/05/23 11:47, David Hildenbrand wrote: > On 05.01.23 11:17, James Houghton wrote: > > This series introduces the concept of HugeTLB high-granularity mapping > > (HGM). This series teaches HugeTLB how to map HugeTLB pages at > > high-granularity, similar to how THPs can be PTE-mapped. > > > > Support for HGM in this series is for MAP_SHARED VMAs on x86 only. Other > > architectures and (some) support for MAP_PRIVATE will come later. > > Why even care about the complexity of COW-sharable anon pages? TBH, I'd just > limit this to MAP_SHARED and call it a day. Sure, we can come up with use > cases for everything (snapshotting VMs using fork while also support > optimized postcopy), but I think this would need some real justification for > the added complexity and possible (likely!) issues. I believe the primary use case driving this beyond MAP_SHARED would be poisoning due to memory errors. Extending HGM seems to be the most elegant way to start providing better support for this. -- Mike Kravetz
