Peter Wemm wrote:
Stephan realized that the kernel already allocates one PTE per virtual page. Although it normally holds physical addresses plus attributes, as long as we don't set PG_V, then there are 31 other bits that we could use for data storage. We could put virtual addresses in there so long as we didn't set PG_V, and abuse that to have a singly linked freelist threaded through the PTEs. It turned out even easier though. As long as the virtual addresses are page aligned, we neatly avoid all the PG_* mode bits as well.
... because you can shift by the page size, saving 12 bits. But are there any problems with 2 MB pages?
Great ideas, both you and [EMAIL PROTECTED] You know, you can store 2 pointers there with XOR. ;-)
-- Nate _______________________________________________ cvs-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
