On Fri, Feb 07, 2025 at 06:34:43PM +0900, Honggyu Kim wrote: > On 2/7/2025 5:57 PM, Gregory Price wrote: > > > The default kernel stack size is like 16kb. You'd need like 100,000 > > threads to eat up 1.5GB, and 2048 threads only eats like 32MB. > > > > It's not an interesting amount of memory if you have a 20TB system. > > The amount might be small, but having those data in slow tier can > make performance degradation if it is heavily accessed. > > The number of accesses isn't linearly corelated to the size of the > memory region. > Right, I started by saying: [CXL is] "generally not fit for kernel use" I have the opinion that CXL memory should be defaulted to ZONE_MOVABLE, but I understand the pressure on ZONE_NORMAL means this may not be possible for large capacities. I don't think the solution is to make kernel memory migratable and allow kernel allocations on CXL. There's a reason most kernel allocations are not swappable. > Thanks, > Honggyu
