On 3/30/26 18:19, Matthew Wilcox wrote: > On Tue, Mar 31, 2026 at 12:09:42AM +0800, WANG Rui wrote: >> Given the diversity of filesystems in use, each one requires dedicated >> engineering effort to implement and validate large folio support, and >> that assumes both sufficient resources and prioritization on the >> filesystem side. Even after support lands, coverage across different >> base page sizes and configurations may take additional time to mature. >> >> What I am really concerned about is the transition period: if filesystem >> support is not yet broadly ready, while we have already removed the >> fallback path, we may end up in a situation where PMD-sized mappings >> become effectively unavailable on many systems for some time. >> >> This is not about the long-term direction, but about the timing and >> practical readiness. > > If we leave this fallback in place, we'll never get filesystems to move > forward. It's time to rip off this bandaid; they've got eight months > before the next stable kernel.
I guess if we don't force them to work on it I guess this will never happen. They shouldn't be holding our THP hacks we want to remove hostage. -- Cheers, David
