devkanro edited a comment on issue #4165: Add kotlin coroutine plugin URL: https://github.com/apache/skywalking/pull/4165#issuecomment-570762748 > One question to all, does this plugin suppose to optional or default. How wide does routine use in kotlin? Could it have side effect as default for all coroutine? @wu-sheng I think this can be divided into four cases. ### Pure Java Pure java will not exist the interception point, the plugin will not be activated, maybe no additional cost with this case, just 1 classes be loaded. ### Kotlin but no coroutine Kotlin is becoming popular in the back-end stack, because of Kotlin's practical and straightforward grammar and powerful stdlib. But most people maybe use Kotlin to instead of Java, but no more coroutines or other adv features. But if you don't have dependent on `org.jetbrains.kotlinx:kotlinx-coroutines-core`, the interception point will not exist too. ### Kotlin with coroutine in business code Maybe sometimes, people will use coroutine in their business code, and don't care about the tracing in the coroutine. It will cause some performance loss, about create two context snapshots cost. ### Kotliun with coroutine stack This is my use case. I'm using a full coroutine stack framework, and it is necessary to make the links traceable. It will cost about create two context snapshots, a span, a `TracingRunnable` object.
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