[crac] RFR: 8367975: [CRaC] Pattern in CRaCCheckpointTo

[Timofei Pushkin]

On Tue, 23 Sep 2025 12:24:43 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

>> src/hotspot/share/runtime/crac.cpp line 198:
>> 
>>> 196:             buf += ret;
>>> 197:             buflen -= ret;
>>> 198:           } // otherwise just empty string
>> 
>> I think we should print a warning otherwise
>
> I don't think so; `cpu_features_binary` will return false on `aarch64`, and I don't think the user has to use different patterns to checkpoint on different architectures.

>From the other hand, it can be confusing to get absolutely nothing in the place of this pattern. But if we explicitly document that this is possible, I am OK with leaving it as is.

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PR Review Comment: https://git.openjdk.org/crac/pull/264#discussion_r2372166780