• David S. Miller's avatar
    sparc64: Move from 4MB to 8MB huge pages. · 37b3a8ff
    David S. Miller authored
    The impetus for this is that we would like to move to 64-bit PMDs and
    PGDs, but that would result in only supporting a 42-bit address space
    with the current page table layout.  It'd be nice to support at least
    43-bits.
    
    The reason we'd end up with only 42-bits after making PMDs and PGDs
    64-bit is that we only use half-page sized PTE tables in order to make
    PMDs line up to 4MB, the hardware huge page size we use.
    
    So what we do here is we make huge pages 8MB, and fabricate them using
    4MB hw TLB entries.
    
    Facilitate this by providing a "REAL_HPAGE_SHIFT" which is used in
    places that really need to operate on hardware 4MB pages.
    
    Use full pages (512 entries) for PTE tables, and adjust PMD_SHIFT,
    PGD_SHIFT, and the build time CPP test as needed.  Use a CPP test to
    make sure REAL_HPAGE_SHIFT and the _PAGE_SZHUGE_* we use match up.
    
    This makes the pgtable cache completely unused, so remove the code
    managing it and the state used in mm_context_t.  Now we have less
    spinlocks taken in the page table allocation path.
    
    The technique we use to fabricate the 8MB pages is to transfer bit 22
    from the missing virtual address into the PTEs physical address field.
    That takes care of the transparent huge pages case.
    
    For hugetlb, we fill things in at the PTE level and that code already
    puts the sub huge page physical bits into the PTEs, based upon the
    offset, so there is nothing special we need to do.  It all just works
    out.
    
    So, a small amount of complexity in the THP case, but this code is
    about to get much simpler when we move the 64-bit PMDs as we can move
    away from the fancy 32-bit huge PMD encoding and just put a real PTE
    value in there.
    
    With bug fixes and help from Bob Picco.
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    37b3a8ff
mmu_64.h 3.1 KB