Thanks Roger!
David
On 27/05/2020 12:28 am, Roger Riggs wrote:
Looks good.
Thanks to Mark and you for the improvement and testing.
On 5/26/20 12:59 AM, David Holmes wrote:
bug: https://bugs.openjdk.java.net/browse/JDK-8242504
webrev: http://cr.openjdk.java.net/~dholmes/8242504/webrev/
This work was contributed by Mark Kralj-Taylor:
https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2020-April/038975.html
On the hotspot side we change the Linux implementations of
javaTimeMillis() and javaTimeSystemUTC() so that they use
clock_gettime(CLOCK_REALTIME) instead of gettimeofday(). In keeping
with our conditional use of this API I added a new guard
os::Posix::supports_clock_gettime()
and refined the existing supports_monotonic_clock() so that we can
still use CLOCK_REALTIME if CLOCK_MONOTONIC does not exist. In the
future (hopefully very near future) we will simply assume these APIs
always exist.
On the core-libs side the existing test:
test/jdk/java/time/test/java/time/TestClock_System.java
is adjusted to track the precision in more detail.
Finally Mark has added instantNowAsEpochNanos() to the benchmark
previously known as
test/micro/org/openjdk/bench/java/lang/Systems.java
which I've renamed to SystemTime.java as Mark suggested. I agree
having these three functions measured together makes sense.
Testing:
- test/jdk/java/time/test/java/time/TestClock_System.java
- test/micro/org/openjdk/bench/java/lang/SystemTime.java
- Tiers 1-3
Thanks,
David
