RFR: 8276711: compiler/codecache/cli tests failing when SegmentedCodeCache used with -Xint [v3]

[David Holmes]

On Thu, 3 Mar 2022 00:15:24 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> According to my conversation with Rickard, TierStopAtLevel=0 is the same as -Xint.  If TieredStopAtLevel=0, the compiler won't allocate nmethods in the MethodProfiled and MethodNonProfiled areas anyway, so this won't allocate them now.
>
> I think this code was missed during Igor's V. changes which introduced `CompilerConfig::is_interpreter_only()`.
> Coleen is correct, with `TieredStopAtLevel=0` all JIT compilers are disabled. `MethodNonProfiled` is codeheap for tier1 (C1) and tier4 (C2) compiled nmethods. It does not make sense to have such codeheap when compilation disabled.

Okay, so does that mean this block:

} else {
    // No TieredCompilation: we only need the non-nmethod and non-profiled code heap
    return (code_blob_type == CodeBlobType::NonNMethod) ||
           (code_blob_type == CodeBlobType::MethodNonProfiled);
}

is actually unreachable?

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PR: https://git.openjdk.java.net/jdk/pull/7650