Re: [RFC PATCH v3 0/6] Direct Map Removal for guest_memfd

On 11/1/24 12:29, Manwaring, Derek wrote:

As far as performance, are you talking about just the fracturing or something beyond that? The data Mike brought to LSFMMBPF 2023 showed the perf impact from direct map fragmentation for memfd_secret isn't "that bad" [1].

Just the fracturing.

Mike's data are interesting, but I still think we're pretty far away from saying that the kernel doesn't need large mappings.