Re: [PATCH 00/46] Based on latest mm-unstable (85b44c25cd1e).

From: David Hildenbrand
Date: Thu Jan 05 2023 - 05:48:58 EST


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.

--
Thanks,

David / dhildenb