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Course Outline
Introduction
- A brief history of GNU/Linux
- Licensing models
- Kernel versioning
- Release cycles
- Kernel trees
- Mainline kernel
- Kernel vs. user space
- Mechanism vs. policy
- Alternatives for kernel drivers
- RTOS vs. Linux
Memory Management
- Virtual memory vs. physical memory
- Memory allocation in the kernel
- Pages
- Zones
- Memory management API
- Slab allocator
Kernel Patching
- Lifecycle of a patch
- Using git
- Kernel source code
- Creating patches
- Checking patches
- Fixing patches
- Submitting patches
- Audited code
Kernel Modules
- Acquiring kernel sources
- Configuration, building, and installation
- Device drivers (statically linked and loaded at runtime)
- Initialization and exit functions
- Licensing implications
- EXPORT_SYMBOL_GPL
- Out-of-tree Makefiles
- module-init-tools
- Adding modules to the kernel tree
- Kconfig
- Passing parameters to modules
- Sparse static analysis
Character Drivers
- Architecture
- User/kernel interface
- I/O subsystem
- VFS (Virtual File System)
- sysfs (devices, bus, drivers, classes)
- kobject/ktype/kset structures
- Linux kernel driver model
- Device files
-
Character drivers
- Initialization
- Registration
- Open and release operations
- cdev, cdev_add, cdev_del, etc.
- Major and minor numbers
- udev, udevmonitor, udevadm
Advanced Character Driver Operations
- ioctl
- Unlocked ioctl
- Compat ioctl
- User-space API
- Kernel-space API
- Process lifecycle
- Sleeping and blocking
- Sleeping and waking up
- Wait queues
- Thundering herd problem
- Poll and select
Kernel Debugging
- General debugging concepts
-
Debugging the kernel
- Binary search with git
- Kernel debug support
- printk, syslogd, klogd, log levels, rate limits, debug levels, and selective subsystem debugging
- Debugging via debugfs
- Oops debugging and triggering oopses
- Magic SysRq Key
- kgdb/kdb
- JTAG debugging
Tracing
- gcov
- lcov
- oprofile
-
ftrace
- nop tracer
- function tracer
- sched_switch tracer
- function_graph tracer
- Dynamic tracer
- trace-cmd/kernelshark
- perf
- LTTng
Interrupts
- Interrupts vs. polling
- Interrupt handling
- Program sections
- Reentrancy
- Events
- Interrupt handlers
- Shared interrupt handlers
- Interrupt flow
- Interrupt control
Deferring Work
- Top-half and bottom-half processing
- Softirqs
- Tasklets
- Workqueues
- Threaded interrupts
Concurrency
- Critical regions/sections
- Atomic operations
- Race conditions
- Synchronization
- Locking mechanisms
- Locking solutions
- Deadlocks
- Contention
- What to lock?
-
What synchronization primitives can be used?
- Atomic operations
- Spinlocks
- Reader-writer spinlocks
- Semaphores
- Binary semaphores
- Mutexes
- Reader-writer semaphores
- Completion variables
- Seqlocks
- Disabling preemption
- Ordering and memory barriers
Timekeeping
- HZ
- Jiffies
- Short and long delays
- Kernel timers
Hardware I/O
- I/O Ports
- I/O Memory
- Managing side effects when accessing registers
User-Kernel Communication
- put_user/get_user
- copy_to_user/copy_from_user
- Kernel I/O
- Memory mapping
- procfs
- sysfs
- debugfs
- relayfs
- netlink
- ioctl
Portability
- Word size
- Opaque types
- Signed/unsigned char
- Data alignment
- Integral promotion
- Code reuse
- Endianness
- System tick
- Page size
- Instruction ordering
- SMP, preemption, and high memory
Except where otherwise noted, content and this course outline are licensed under Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).
Requirements
- Basic familiarity with using a GNU/Linux system as an end user
- Basic familiarity with a command-line shell
- Basic knowledge of user-space or application development
- Intermediate proficiency in C programming
- Participants should have previously attended Embedded GNU/Linux Systems Architecture (strongly recommended) and/or possess a solid understanding of the topics covered in that course.
35 Hours
Testimonials (3)
Everything is ok.
Adrian Rybka - SEOyon
Course - Flutter Development Bootcamp with Dart
Very usefull additional informations
Grzegorz - Comp S.A.
Course - BLoC Pattern
His knowledge and patience.
