On Thu, May 18, 2023 at 12:03:03PM -0700, Song Liu wrote: > > Second, bitmap based solution cannot handle > 2MiB allocation cleanly, > > while tree based solution can. For example, if a big driver uses 3MiB, the > > tree based allocator can allocate 4MiB for it, and use the rest 1MiB for > > smaller allocations. 2 MB is just a good default size for the initial unmapped allocations if the main consideration is avoiding mapping fragmentation. The approach can work with larger allocations if required.
