AArch64: Wrong processor type with traceformat

[knn-k]

Running traceformat on the Snap file from AArch64 Linux generated the following output. Arch family and Processor Sub-type are wrong.

Processor information:
        Arch family:         Unknown
        Processor Sub-type:  i486
        Num Processors:      8
        Big Endian:          false
        Word size:           64
        Using Trace Counter: J9 timer

I used the following version:

openjdk version "11.0.21" 2023-10-17
IBM Semeru Runtime Open Edition 11.0.21.0 (build 11.0.21+9)
Eclipse OpenJ9 VM 11.0.21.0 (build openj9-0.41.0, JRE 11 Linux aarch64-64-Bit Compressed References 20231122_825 (JIT enabled, AOT enabled)
OpenJ9   - 461bf3c70
OMR      - 5eee6ad9d
JCL      - 0fd7a05277 based on jdk-11.0.21+9)

[knn-k]

It seems PR #7446 added related code for RISC-V.

[knn-k]

TraceFileHeaderWriter.java for DDR also has the lists of processor architectures and subtypes, but they don't contain AArch64 and RISC-V.

openj9/debugtools/DDR_VM/src/com/ibm/j9ddr/tools/ddrinteractive/commands/TraceFileHeaderWriter.java

Lines 50 to 51 in 2954ed7

	private final static String[] Archs = { "Unknown", "x86", "S390", "Power", "IA64", "S390X", "AMD64" };
	private final static String[] SubTypes = { "i486", "i586", "Pentium II", "Pentium III", "Merced", "McKinley", "PowerRS", "PowerPC", "GigaProcessor", "ESA", "Pentium IV", "T-Rex", "Opteron" };

[knn-k]

PR #18643 fixes traceformat. I opened Issue #18647 for DDR TraceFileHeaderWriter.java.