RFR 8068977 Remove unused sun.misc.Unsafe prefetch intrinsic support

Vladimir Kozlov vladimir.kozlov at oracle.com
Thu Feb 5 17:32:23 UTC 2015


I don't see in you patch code removal in src/share/vm/prims/unsafe.cpp


On 2/5/15 9:15 AM, Vladimir Kozlov wrote:
> Hi Paul,
> These are JIT compilers changes so I added correct mailing list.
> Changes look fine to me. Make sure it passed JPRT.
> RFE:
> https://bugs.openjdk.java.net/browse/JDK-8068977
> "Note read/write prefetch support was implemented as an experiment to see if JDK library code could use it for
> performance advantages. However, the results of the experiment did not indicate this was worthwhile."
> Also note, there are no corresponding prefetch native methods declaration in sun.misc.Unsafe. We had it sometime in
> local sources for experiments but we never pushed those changes into main s.m.Unsafe sources.
> Thanks,
> Vladimir
> On 2/5/15 4:07 AM, Paul Sandoz wrote:
>> Hi.
>> Please review this patch to remove prefetch read/write support:
>> http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8068977-hotspot-prefetch-intrinsic-cleanup/webrev/
>> This is covering a lot of areas and i could of easily fat fingered something and/or in my ignorance made a mistake, so
>> please check carefully.
>> There is a corresponding patch for closed source that i will send internally.
>> Paul.

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