On Fri, Jul 26, 2024 at 09:46:18PM +1200, Barry Song wrote: > A user space interface can be implemented to select different swap-in > order policies, similar to the mTHP allocation order policy. We need > a distinct policy because the performance characteristics of memory > allocation differ significantly from those of swap-in. For example, > SSD read speeds can be much slower than memory allocation. With > policy selection, I believe we can implement mTHP swap-in for > non-SWAP_SYNCHRONOUS scenarios as well. However, users need to understand > the implications of their choices. I think that it's better to start > with at least always never. I believe that we will add auto in the > future to tune automatically, which can be used as default finally. I strongly disagree. Use the same sysctl as the other anonymous memory allocations.
