On Tuesday, 24 February 2015 at 15:14:03 UTC, Ola Fosheim Grøstad
wrote:
On Tuesday, 24 February 2015 at 14:45:17 UTC, Marc Schütz wrote:
It's possible to (ab)use the MMU as a write barrier.
Uhm...
The throughput for L/SFENCE is 5 cycles and SFENCE 33 cycles...
The cost of a page miss is 1000 cycles + overhead for copying.
And that's assuming that you have enough memory and that the
TLB isn't affected...
Yes, but if the program has a small working set, you pay that
price only a few times (once per page), and in any case, only
during a running background scan, rather than always.
