On Wed, Feb 14, 2018 at 11:29 AM, Kees Cook <keesc...@chromium.org> wrote:
> Why does using finer granularity on the physmap degrade performance? I
> assume TLB pressure, but what is heavily using that area? (I must not
> be understanding what physmap actually gets used for -- I thought it
> was just a convenience to have a 1:1 virt/phys map for some lookups?)
Jann has sorted me out: it's that physmap isn't an _alias_ for the
buddy allocator memory areas; it's used directly.