> I have managed to update the TLB code to make proper use of dirty and > accessed states. > Advantages are: > - I/D TLB Miss never needs to write to the linux pte, saving a few cycles
That's good, that leaves us with only 40x to fix now. Also we can remove atomic updates of PTEs for all non-hash. It's pointless on those CPUs anyway. > - Accessed is only set by I/D TLB Error, should be a plus when SWAP is used. No need for that neither. ISI/DSI shouldn't touch the PTE. They should just fall back to C code which takes care of it all.l > - _PAGE_DIRTY is mapped to 0x100, the changed bit, and is set directly > and there will be no extra DTLB Error to actually set the changed bit > when a page has been made dirty. > - Proper RO/RW mapping of user space. > > Cons: > - 4 more insn in TLB Miss handlers, but the since the linux pte isn't > written it should still be a win. > > However, I did this on my 2.4 tree but I can port it to 2.6 if you guys > can test it for me. Why don't you use and test 2.6 ? :-) Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
