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| author | Lukas Larsson <[email protected]> | 2014-09-11 18:26:26 +0200 |
|---|---|---|
| committer | Lukas Larsson <[email protected]> | 2016-02-02 10:45:21 +0100 |
| commit | eea5f896780e07f7ca76685061d01e7be5a7abaa (patch) | |
| tree | 7d4a852b20f2075637457052844865e1c56b1e21 /erts/emulator/beam/ops.tab | |
| parent | d76ee58c07f32dfc0652844ec2b513af2105ffa1 (diff) | |
| download | otp-eea5f896780e07f7ca76685061d01e7be5a7abaa.tar.gz otp-eea5f896780e07f7ca76685061d01e7be5a7abaa.tar.bz2 otp-eea5f896780e07f7ca76685061d01e7be5a7abaa.zip | |
erts, kernel: Add os:perf_counter function
The perf_counter is a very very cheap and high resolution timer
that can be used to timestamp system events. It does not have
monoticity guarantees, but should on most OS's expose a monotonous
time.
A special instruction has been created for this counter to further
speed up fetching it.
OTP-12908
Diffstat (limited to 'erts/emulator/beam/ops.tab')
| -rw-r--r-- | erts/emulator/beam/ops.tab | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/erts/emulator/beam/ops.tab b/erts/emulator/beam/ops.tab index 081c4108a0..9e53b4bfcc 100644 --- a/erts/emulator/beam/ops.tab +++ b/erts/emulator/beam/ops.tab @@ -988,6 +988,13 @@ move Discarded x==0 | move Something x==0 => move Something x=0 %endif +call_ext u==0 u$func:os:perf_counter/0 => \ + i_perf_counter +call_ext_last u==0 u$func:os:perf_counter/0 D => \ + i_perf_counter | deallocate_return D +call_ext_only u==0 u$func:os:perf_counter/0 => \ + i_perf_counter | return + # # The general case for BIFs that have no special instructions. # A BIF used in the tail must be followed by a return instruction. @@ -1027,6 +1034,8 @@ i_apply_fun_only i_hibernate +i_perf_counter + call_bif e # |