On Wed, 21 Oct 2020 09:09:49 GMT, Nick Gasson <ngas...@openjdk.org> wrote:
> Yes that sounds like a good idea. Add a (diagnostic?) option > `-XX:+WritePerfMapOnExit`? I think we should use this option carefully because nmethod might be unloaded. So we should use this with `-XX:-UseCodeCacheFlushing`. BTW we can use `Compiler.codelist` dcmd for this purpose now. If you implement `WritePerfMapOnExit`, we should consider code cache flushing and should use `Compiler.codelist` in some case. I've published perfmap generator from `Compiler.codelist` https://github.com/YaSuenag/saperf ------------- PR: https://git.openjdk.java.net/jdk/pull/760
