• David S. Miller's avatar
    [SPARC64]: Move away from virtual page tables, part 1. · 74bf4312
    David S. Miller authored
    We now use the TSB hardware assist features of the UltraSPARC
    MMUs.
    
    SMP is currently knowingly broken, we need to find another place
    to store the per-cpu base pointers.  We hid them away in the TSB
    base register, and that obviously will not work any more :-)
    
    Another known broken case is non-8KB base page size.
    
    Also noticed that flush_tlb_all() is not referenced anywhere, only
    the internal __flush_tlb_all() (local cpu only) is used by the
    sparc64 port, so we can get rid of flush_tlb_all().
    
    The kernel gets it's own 8KB TSB (swapper_tsb) and each address space
    gets it's own private 8K TSB.  Later we can add code to dynamically
    increase the size of per-process TSB as the RSS grows.  An 8KB TSB is
    good enough for up to about a 4MB RSS, after which the TSB starts to
    incur many capacity and conflict misses.
    
    We even accumulate OBP translations into the kernel TSB.
    
    Another area for refinement is large page size support.  We could use
    a secondary address space TSB to handle those.
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    74bf4312
Makefile 1.22 KB