> > > $ cat /sys/kernel/mm/transparent_hugepage/hpage_pmd_size > > > 2097152 > > > > Is "pmd" x86 specific? > > It's linux specific, this is common code, nothing x86 specific. In > fact on x86 it's not called pmd but Page Directory. I've actually no > idea what pmd stands for but it's definitely not x86 specific and it's > just about the linux common code common to all archs. The reason this > is called hpage_pmd_size is because it's a #define HPAGE_PMD_SIZE in > the kernel code. So this entirely match the kernel internals > _common_code_.
Hmm, ok. I'm guessing linux doesn't support anything other than "huge" and "normal" page sizes now, so it's a question of whether we want it to expose current implementation details, or say "Align big in-memory things this much for optimal TLB behavior". Paul
