On 08.09.20 16:41, Rik van Riel wrote: > On Tue, 2020-09-08 at 16:35 +0200, Michal Hocko wrote: > >> A global knob is insufficient. 1G pages will become a very precious >> resource as it requires a pre-allocation (reservation). So it really >> has >> to be an opt-in and the question is whether there is also some sort >> of >> access control needed. > > The 1GB pages do not require that much in the way of > pre-allocation. The memory can be obtained through CMA, > which means it can be used for movable 4kB and 2MB > allocations when not > being used for 1GB pages. > > That makes it relatively easy to set aside > some fraction > of system memory in every system for 1GB and movable > allocations, and use it for whatever way it is needed > depending on what workload(s) end up running on a system. > Linking secretmem discussion https://lkml.kernel.org/r/fdda6ba7-9418-2b52-eee8-ce5e9bfdb6ad@xxxxxxxxxx -- Thanks, David / dhildenb
