RFR: 8368261: Serial: Use more precise nmethod scope during Full GC marking

[Albert Mingkun Yang]

On Mon, 22 Sep 2025 13:33:00 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Do you think it would be good to get rid of the scope starting at line 485.

I think it's missing a scoped timer there. For example, Parallel full-gc has `GCTraceTime(Debug, gc, phases) tm("Par Mark", &_gc_timer);` in the corresponding place.

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PR Comment: https://git.openjdk.org/jdk/pull/27423#issuecomment-3319125514