OSR.java

//java -XX:+PrintCompilation -XX:CompileOnly=OSR::main -XX:CompileCommand=quiet  -XX:-TieredCompilation OSR
import java.io.FileWriter;   // Import the FileWriter class
import java.io.IOException;  // Import the IOException class to handle errors

class OSR {
    public static void main(String[] args) throws IOException {
        FileWriter writer = new FileWriter("/dev/null");

        for (int i=0; i<3_000_000; ++i) {
            writer.write(".");
        }
        writer.close();
    }
}

java -XX:+PrintCompilation -XX:CompileOnly=OSR::main -XX:CompileCommand=quiet OSR
325 1 % 3 OSR::main @ 12 (35 bytes)
330 2 3 OSR::main (35 bytes)
521 3 % 4 OSR::main @ 12 (35 bytes)
536 1 % 3 OSR::main @ 12 (35 bytes) made not entrant
6113 3 % 4 OSR::main @ 12 (35 bytes) made not entrant

here is c2-only case. only OSR compilation happens.

java -XX:+PrintCompilation -XX:CompileOnly=OSR::main -XX:CompileCommand=quiet -XX:-TieredCompilation OSR
105 1 % OSR::main @ 12 (35 bytes)
6142 1 % OSR::main @ 12 (35 bytes) made not entrant