On Tue, Mar 28, 2023 at 02:44:27PM -0700, Yosry Ahmed wrote: > > Your swap descriptor will be using one swp_entry_t, which get from the PTE > > to lookup, right? That is the swap entry I am talking about. You just > > substitute zswap swap entry with the swap descriptor swap entry. > > You still need to allocate from the free swap entry space at least once. > > Oh, you mean the swap ID space. We just need to find an unused ID, we > can simply use an allocating xarray > (https://docs.kernel.org/core-api/xarray.html#allocating-xarrays). > This is simpler than keeping track of swap slots in a swapfile. Ah I see. That makes sense. Thanks for explaining it to me. The real block swap device will still need to scan the swap_map to find an empty space to write the page. Chris
