8179527: Ineffective use of volatile hurts performance of Charset.atBugLevel()

Langer, Christoph christoph.langer at sap.com
Wed Jun 28 09:23:43 UTC 2017


I just filed the CSR: https://bugs.openjdk.java.net/browse/JDK-8183116. I set it to status "Proposed". I assume it will be handled by the csr group automatically?

As for the patch: I just recognized that we'll need to update the tests jdk/test/java/nio/charset/Charset/EmptyCharsetName.java and jdk/test/java/nio/charset/CharsetDecoder/AverageMax.java if we remove "sun.nio.cs.bugLevel". E.g. remove the second run with -Dsun.nio.cs.bugLevel=1.4 and clean the code for that. @Ogata: Can you please do that? You might chose to wait until the CSR process is done...

Best regards

PS: The bug is https://bugs.openjdk.java.net/browse/JDK-8182743, not 8179527, as the Subject indicates.

> -----Original Message-----
> From: Alan Bateman [mailto:Alan.Bateman at oracle.com]
> Sent: Mittwoch, 28. Juni 2017 11:00
> To: Langer, Christoph <christoph.langer at sap.com>; Kazunori Ogata
> <OGATAK at jp.ibm.com>
> Cc: ppc-aix-port-dev at openjdk.java.net; Claes Redestad
> <claes.redestad at oracle.com>; core-libs-dev <core-libs-
> dev at openjdk.java.net>; nio-dev at openjdk.java.net
> Subject: Re: 8179527: Ineffective use of volatile hurts performance of
> Charset.atBugLevel()
> On 27/06/2017 19:32, Langer, Christoph wrote:
> > :
> >
> > @Alan: Do we need a CSR ("Compatibility & Specification Review") request
> here since support for "sun.nio.cs.bugLevel" will be removed?
> >
> This system property pre-dates OpenJDK but it would have had a CCC at
> the time. So creating a CSR to indicate that it can no longer be used to
> get to JDK 1.4 behavior would be good. Thanks.
> -Alan

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