On Thu, Feb 16, 2023 at 11:59:24AM -0800, Peter Collingbourne wrote: > Instead of changing the page's tag solely in order to obtain a pointer > with a match-all tag and then changing it back again, just convert the > pointer that we get from kmap_atomic() into one with a match-all tag > before passing it to clear_page(). > > On a certain microarchitecture, this has been observed to cause a > measurable improvement in microbenchmark performance, presumably as a > result of being able to avoid the atomic operations on the page tag. > > Signed-off-by: Peter Collingbourne <pcc@xxxxxxxxxx> > Link: https://linux-review.googlesource.com/id/I0249822cc29097ca7a04ad48e8eb14871f80e711 Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx> Not sure how this will go upstream, maybe the mm tree? Otherwise happy to take it through the arm64 tree. Thanks. -- Catalin
