[llvm-dev] How to dynamically turn on/off XRay tracing?

[徐明杰 via llvm-dev]

Hi all!
According to XRay whitepaper ("XRay: A Function Call Tracing System"), XRay
tracing can be turned on and off dynamically without having to restart the
server.

However, I only found that we can use the XRAY_OPTIONS environment variable
to enable or disable XRay at application start.
Is there any way to turn on/off dynamically without having to restart the
server?

Regards,
Xu Mingjie @ ByteDance
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