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Base: Document the new /sys/kernel/ directory

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Liav A 2022-10-15 06:03:58 +03:00 • committed by Andrew Kaster
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Base/usr/share/man/man7/sys.md
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@ -37,6 +37,47 @@ A file called `power_state` is responsible for power state switching.
This file only responds to write requests on it. A written value of `1` results
in system reboot. A written value of `2` results in system shutdown.
### `kernel` directory
This directory includes two subdirectories - `net` and `variables`.
All other files in the directory are global data nodes which provide statistics
and other kernel-related data to userspace.
#### `kernel` directory entries
* **`processes`** - This node exports a list of all processes that currently exist.
* **`cmdline`** - This node exports the kernel boot commandline that was passed from the bootloader.
* **`cpuinfo`** - This node exports information on the CPU.
* **`df`** - This node exports information on mounted filesystems and basic statistics on
them.
* **`dmesg`** - This node exports information from the kernel log.
* **`interrupts`** - This node exports information on all IRQ handlers and basic statistics on
them.
* **`load_base`** - This node reveals the loading address of the kernel.
* **`keymap`** - This node exports information on the currently used keymap.
* **`memstat`** - This node exports statistics on memory allocation in the kernel.
* **`profile`** - This node exports statistics on profiling data.
* **`stats`** - This node exports statistics on scheduler timing data.
* **`system_mode`** - This node exports the chosen system mode as it was decided based on the kernel commandline or a default value.
* **`uptime`** - This node exports the uptime data.
#### `net` directory
* **`adapters`** - This node exports information on all currently-discovered network adapters.
* **`arp`** - This node exports information on the kernel ARP table.
* **`local`** - This node exports information on local (Unix) sockets.
* **`tcp`** - This node exports information on TCP sockets.
* **`udp`** - This node exports information on UDP sockets.
#### `variables` directory
This subdirectory includes global settings of the kernel.
* **`caps_lock_to_ctrl`** - This node controls remapping of of caps lock to the Ctrl key.
* **`kmalloc_stacks`** - This node controls whether to send information about kmalloc to debug log.
* **`ubsan_is_deadly`** - This node controls the deadliness of the kernel undefined behavior
sanitizer errors.
### Consistency and stability of data across multiple read operations
When opening a data node, the kernel generates the required data so it's prepared