Summary

JDK-8227003 adds a flag -XX:CompilationMode to allow the user to symbolically specify the compilation mode.

The current supported values are: default: normal tiered compilation quick-only: C1-only mode high-only: C2/JVMCI-only mode
high-only-quick-internal: C2/JVMCI-only mode, with JVMCI compiler compiled with C1.

There will be possibly more modes added in the future.

Problem

No way to control interesting compilation strategies.

Solution

Add a flag to select compilation strategies.

Specification

2192   product(ccstr, CompilationMode, "default",                                \
2193           "Compilation modes: "                                             \
2194           "default: normal tiered compilation; "                            \
2195           "quick-only: C1-only mode; "                                      \
2196           "high-only: C2/JVMCI-only mode; "                                 \
2197           "high-only-quick-internal: C2/JVMCI-only mode, "                  \
2198           "with JVMCI compiler compiled with C1.")                          \
2199                   

see

Webrev: http://cr.openjdk.java.net/~iveresov/8227003/webrev.03/