- Don't need to count anonpages+filepages any more; clean+unknown+dirty for
each kind of page can be summed to get the totals.
- Track the number of free pages with a counter so that it's one less thing
for the allocator to do, which opens up further options there.
- Remove cpu_count_sync_one(). It has no users and doesn't save a whole lot.
For the cheap option, give cpu_count_sync() a boolean parameter indicating
that a cached value is okay, and rate limit the updates for cached values
to hz.
function cpu_topology_setspeed which sets the relative speed of the
cpu.
This allows cpu_topology_set is be used at cpu hatch time. The relative
speed is only known once all cpus have hatched/attached
OK ad@
while attaching cpus, if the FDT provides "capacity-dmips-mhz" track
the fastest set, and call cpu_topology_set() with slow=true for any
cpus that are not the fastest.
bug fix for cpu_topology_set(): actually set ci_is_slow for slow cpus.
with this change, and -current's recent scheduler changes, this means
that long running processes run on the faster cores. on RK3399 based
systems, i am seeing 20-50% speed ups for many tasks.
XXX: all this can be made common with armv7 big.little.
better job now at keeping all physical CPUs busy, while using the extra
threads to help out. In particular, during preempt() if we're using SMT,
try to find a better CPU to run on and teleport curlwp there.
- Change the CPU topology stuff so it can work on asymmetric systems. This
mainly entails rearranging one of the CPU lists so it makes sense in all
configurations.
- Add a parameter to cpu_topology_set() to note that a CPU is "slow", for
where there are fast CPUs and slow CPUs, like with the Rockwell RK3399.
Extend the SMT awareness to try and handle that situation too (keep fast
CPUs busy, use slow CPUs as helpers).
thorpej