Oscar Salvador wrote: > On Mon, Jan 27, 2025 at 10:34:02AM -0500, Gregory Price wrote: > > v8: nits and tag pickups > > > > When physical address regions are not aligned to memory block size, > > the misaligned portion is lost (stranded capacity). > > > > Block size (min/max/selected) is architecture defined. Most architectures > > tend to use the minimum block size or some simplistic heurist. On x86, > > memory block size increases up to 2GB, and is otherwise fitted to the > > alignment of non-hotplug (i.e. not special purpose memory). > > I wonder if something like this could help us in improving the > ridiculous situation of having 16MB memory-block size on powerpc. It's only ridiculous due to what it does to /sys/.../memory, right? If you permit me a bit of hand-waving, it would be lovely to deprecate /sys/.../memory in favor of a new (fd based?) ABI for memory-hotplug policy management and have something like a fuse "compatfs" mounted at /sys/.../memory/ for maintaining legacy compatibility for userspace that still depends on twiddling with individual blocks in sysfs.
