fbt and Module Loading

The Oracle Solaris kernel can dynamically 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 no enabled 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.