Linux kernel documentation9/27/2023 ![]() ![]() For a list of trademarks of The Linux Foundation, please see our Trademark Usage page. The Linux Foundation has registered trademarks and uses trademarks. The modern documentation system used internally by the kernel is called Sphinx. © Prometheus Authors 2014-2023 | Documentation Distributed under CC-BY-4.0 You can literally generate the full Linux kernel documentation f rom within the kernel source tree in various popular formats (including PDF, HTML, LaTeX, EPUB, or XML), in a Javadoc or Doxygen-like style. Please help improve it by filing issues or pull requests. The average network traffic received, per second, over the last minute (in bytes) The filesystem space available to non-root users (in bytes) Introduction View slides Lecture objectives: Basic operating systems terms and concepts Overview of the Linux kernel Basic operating systems terms and concepts User vs Kernel Kernel and user are two terms that are often used in operating systems. tmpfs puts everything into the kernel internal caches and grows and shrinks to accommodate the files. If you unmount a tmpfs instance, everything stored therein is lost. Everything in tmpfs is temporary in the sense that no files will be created on your hard drive. Return the bit offset in bitmap of the allocated region, or -errno on failure. Only consider regions of length a power ( order) of two, aligned to that power of two, which makes the search algorithm much faster. The average amount of CPU time spent in system mode, per second, over the last minute (in seconds) Tmpfs is a file system which keeps all of its files in virtual memory. Find a region of free (zero) bits in a bitmap of bits bits and allocate them (set them to one). Once the Node Exporter is installed and running, you can verify that metrics are being exported by cURLing the /metrics endpoint: curl You should see output like this: # HELP go_gc_duration_seconds A summary of the GC invocation durations. INFO Listening on :9100 source="node_exporter.go:111" The Linux kernel uses Sphinx to generate pretty documentation from reStructuredText files under Documentation. INFO - boottime source="node_exporter.go:97" INFO Enabled collectors: source="node_exporter.go:90" You should see output like this indicating that the Node Exporter is now running and exposing metrics on port 9100: INFO Starting node_exporter (version=0.16.0, branch=HEAD, revision=d42bd70f4363dced6b77d8fc311ea57b63387e4f) source="node_exporter.go:82" ![]() Once you've downloaded it from the Prometheus downloads page extract it, and run it: wget */node_exporter-*.* The Prometheus Node Exporter is a single static binary that you can install via tarball. Video4Linux (V4L) driver-specific documentation. Linux Digital TV driver-specific documentation. Linux Media Infrastructure userspace API. ![]() However, PWMs are often found as discrete devices on SoCs which have no fixed purpose. Pulse-Width Modulation (PWM) Linux Media Subsystem Documentation. PWMs with a fixed purpose have no need implementing the Linux PWM API (although they could). NOTE: While the Prometheus Node Exporter is for *nix systems, there is the Windows exporter for Windows that serves an analogous purpose. PWMs are commonly used for controlling LEDs, fans or vibrators in cell phones. ![]()
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