Solaris Dynamic Tracing Guide
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Module Loading

The Solaris kernel can dynamic load and unload kernel modules. When FBT is loaded and a module is dynamically loaded, FBT automatically provides new probes associated with the new module. If a loaded module has unenabled FBT probes, the module may be unloaded; the corresponding probes will be destroyed as the module is unloaded. If a loaded module has enabled FBT probes, the module is considered busy, and cannot be unloaded.

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