[crac] RFR: Print better diagnostics for spawning CRIU [v2]

[Anton Kozlov]

On Wed, 9 Aug 2023 22:45:26 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

>> src/java.base/unix/native/criuengine/criuengine.cpp line 91:
>> 
>>> 89:             }
>>> 90:         }
>>> 91:         retval += '\'';
>> 
>> It will be surprised to meet these symbols in the args, and IMHO this is overly complicated way to report them
>
> Should it therefore abort when it sees such symbol? Otherwise the problem will not be reproducible from the error message.

You mean the line is not copy-pastable. But it is not such anyway, as it makes sense only for specific pid, and in the specific point in time (in VM_Crac safepoint).

I'm fine with the current code.

>> src/java.base/unix/native/criuengine/criuengine.cpp line 109:
>> 
>>> 107:     free(cwd_s);
>>> 108:     return path_from(cwd, rel);
>>> 109: }
>> 
>> The problem with this function as abstraction is that it first calculates CWD, then checks was the argument absolute or relative.
>
> The code was more simple that way and it was straightforward to replace it with C++17 `std::filesystem::path` after [OpenJDK makes the switch to C++17](https://bugs.openjdk.org/browse/JDK-8310260).

The interface is fine, the implementation just could be more straightforward and efficient.

The link you're refering has Resolution: Rejected.

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PR Review Comment: https://git.openjdk.org/crac/pull/97#discussion_r1290007985
PR Review Comment: https://git.openjdk.org/crac/pull/97#discussion_r1290006210