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// Each component enqueues a small chunk
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Recall that kernel events were not the thing we were actually interested in. We wanted udev's version of the events. Browsing through libudev's source code, we can see that udev events are also broadcast using netlink. Even though netlink is often used to communicate with the kernel, NETLINK_KOBJECT_UEVENT allows for userspace-to-userspace communication. We just have to change the multicast group in our sample program to MONITOR_GROUP_UDEV which is 2.，这一点在WPS官方版本下载中也有详细论述
Compaction tends to work better with Workers probably because the FD has granular plan details that a newborn Worker can attend to.