On 7/9/16 7:08 PM, Marc Zyngier wrote:
Please realize that this is a work in progress, and that I'm not even
sure I want to upstream this.
OK.
(I wanted to get some performance statistics of the new feature with
perf, but on arm64 most of them are unsupported)
Care to mention which ones are missing?
$ perf stat sleep 5
Performance counter stats for 'sleep 5':
0.589480 task-clock:u (msec) # 0.000 CPUs
utilized
0 context-switches:u # 0.000 K/sec
0 cpu-migrations:u # 0.000 K/sec
35 page-faults:u # 0.059 M/sec
<not supported> cycles:u
<not supported> instructions:u
<not supported> branches:u
<not supported> branch-misses:u
5.024683421 seconds time elapsed
Userland is Fedora 24.
Only a few CPUs support 16kB pages, and Cortex-A57 is definitely not
one of them.
Ah, I did not know that. Thanks.
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