Re: Efficiency of in-order vs. OoO

jgd@cix.co.uk (John Dallman) writes:

The question is if "users" to ARM Holdings are actual end-users, or the
SoC manufacturers who build chips incorporating Aarch64 cores. I'd expect
most of the latter to want those features so that they can understand the
performance of their silicon better.

That might explain why for the AmLogic S922X in the Odroid N2/N2+
there is a Linux 4.9 kernel that supports performance monitoring
counters (AmLogic put that in for their own uses), but the mainline
Linux kernel does not support perf on the S922X (perf was not in the
requirements of whoever integrated the S922X stuff into the mainline).

- anton
--
'Anyone trying for "industrial quality" ISA should avoid undefined behavior.'
  Mitch Alsup, <c17fcd89-f024-40e7-a594-88a85ac10d20o@googlegroups.com>