RFR: 8068736: Avoid synchronization on Executable/Field.declaredAnnotations
Paul Sandoz
paul.sandoz at oracle.com
Thu Jan 15 13:19:09 UTC 2015
On Jan 15, 2015, at 1:32 PM, Claes Redestad <claes.redestad at oracle.com> wrote:
> Hi,
>
> please review this patch to use double-checked locking to avoid
> synchronization overhead on repeated access to the
> declaredAnnotations field in Executable and Field.
>
> webrev: http://cr.openjdk.java.net/~redestad/8068736/webrev.00
> bug: https://bugs.openjdk.java.net/browse/JDK-8068736
>
+1
Paul.
> Testing: jtreg java/lang
>
> Benchmarking:
> - no significant changes in a small set of SPEC benchmarks
> - up to 4x in micros focused on repeated access to the
> declaredAnnotations field, both in single- and multithreaded setups
> - less than 5% cost (not statistically significant) on micros accessing
> the declaredAnnotation map of a method only once.
>
> /Claes
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