>The assumption for the dirty bit is that the i386 cpu are the only cpus
>in the world (TM) that maintain the dirty bit in hardware
Not true; the s390 also has a dirty bit in hardware ;-)
To make things more interesting, the s390 dirty bit does not
reside in the pte, but in a storage key associated with the
*physical* page. The bit is set on any access to the physical
page, whether through any virtual mapping, by direct access
with dynamic address translation switched off, or by an I/O
device moving data directly to main memory.
Bye,
Ulrich
-- Dr. Ulrich Weigand weigand@informatik.uni-erlangen.de - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/