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...
That's why this is used for immutable, or mostly immutable data,
but generally avoided in the case of mutable data.
