RFR: 8168640: (fc) Avoiding AtomicBoolean in FileInput/-OutputStream improves startup
claes.redestad at oracle.com
Tue Oct 25 10:51:01 UTC 2016
in https://bugs.openjdk.java.net/browse/JDK-8025619 the logic for
closing a FileInputStream was changed from a volatile boolean + lock to
use an AtomicBoolean with rather benign effect on startup - up until the
point where VarHandles was integrated, which now means we're
transitively initializing ~20 VarHandle-related classes and perform a
non-trivial amount of initialization during VM initialization.
Avoiding AtomicBoolean improves startup and footprint for a sample of
Testing: passing all File and VarHandle tests locally, running a larger
suite of tests on a wider set of platforms with no issues so far.
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