RFR: 8272297: FileInputStream should override transferTo() for better performance [v2]

[Roman Kennke]

On Fri, 13 Aug 2021 14:41:54 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> > Is this what you have been asking @mkarg in #4263 to do? Optimize transferTo() only for FileInputStream? Would it interfere with #4263?
> 
> #4263 is the input stream returned by Channels.newInputStream where the source may be a FileChannel and the output stream specified to InputStream::transferTo may be connected to a FileChannel.

Having followed both #4263 and this PR from the sidelines, may I ask why for #4263 much more rigorous testing is asked but not here? E.g. test for NPE, random-sized files/buffers, random position, return value, comprehensive JMH tests to show performance, etc? I'm all for high quality standards and good test coverage, but why are we seemingly measuring with double standards?

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PR: https://git.openjdk.java.net/jdk/pull/5097