On Mon, Mar 24, 2025 at 09:16:47AM -0700, Christoph Lameter (Ampere) wrote: > On Fri, 21 Mar 2025, Kees Cook wrote: > > > diff --git a/include/linux/slab.h b/include/linux/slab.h > > index 2717ad238fa2..a4740c8b6ccb 100644 > > --- a/include/linux/slab.h > > +++ b/include/linux/slab.h > > @@ -469,6 +469,8 @@ void __kfree(const void *objp); > > void __kfree_sensitive(const void *objp); > > size_t __ksize(const void *objp); > > > > +extern atomic_t count_nulled; > > That is a scalability issue. Use a vmstat counter instead?
Yeah, this patch (marked "DEBUG") isn't intended for upstreaming. It was just a quick hack to get a ballpark statistic. :) -- Kees Cook
