On Wed, Feb 14, 2018 at 11:29 AM, Kees Cook [off-list ref] 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.

-Kees

-- 
Kees Cook
Pixel Security
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