Hi, various JNI methods in the JDK converts from java Strings to native encoding using JNI_GetStringPlatformChars, which has long standing optimizations for dealing with various default charsets.
However, UTF-8 is missing, which is a shame since we have optimized utilities for converting from a String to UTF-8-encoded char* (since this is the native encoding used by HotSpot internally). Webrev: http://cr.openjdk.java.net/~redestad/8181147/jdk.00/ Bug: https://bugs.openjdk.java.net/browse/JDK-8181147 Allocation rate can drop significantly in microbenchmarks, e.g., -60% in a trivial micro doing new File(path).isHidden() (along with a 30% throughput win), while the rate of native allocation with is net neutral. (I think the code for FAST_646_US could be removed, since Solaris 8 support was dropped in JDK 8, but that's a separate RFE...) Thanks! /Claes
