On Mon, 31 Aug 2026 19:16:31 +0800 "Li Zhe" <[email protected]> wrote:
> memmap_init_zone_device() can take a noticeable amount of time when large
> pmem namespaces are bound or rebound, because it initializes nearly
> identical struct page descriptors one PFN at a time. This series reduces
> that ZONE_DEVICE memmap initialization overhead by reusing prepared
> struct page templates and, on x86, using memcpy_nontemporal() for the
> template copy path.
>
> ...
>
> This reduces the average memmap initialization time measured during
> rebind by about 48.0% for nd_pmem and 41.6% for dax_pmem on that arm64
> VM setup. Since this arm64 setup does not use the x86 MOVNTI fast paths,
> the result also suggests that the generic template-copy optimization can
> benefit architectures without an architecture-specific
> memcpy_nontemporal() backend.
Well that's nice.
Sashiko seems to have found some new things to complain about:
https://sashiko.dev/#/patchset/[email protected]
