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Course Outline
Introduction
- Historical overview of GNU/Linux
- Licensing models
- Kernel versioning schemes
- Release cycles
- Kernel trees
- Mainline development
- Kernel space vs. user space
- Mechanism versus policy
- Alternatives to kernel drivers
- RTOS compared to Linux
Memory Management
- Virtual memory vs. physical memory
- Memory allocation within the kernel
- Pages
- Memory zones
- Application Programming Interfaces (API)
- Slab allocator
Kernel Patches
- Patch lifecycle
- Git usage
- Accessing kernel source code
- Creating patches
- Patch checking
- Patch correction
- Submitting patches
- Audited code practices
Kernel Modules
- Obtaining kernel sources
- Configuring, building, and installing
- Device drivers: static linking vs. runtime loading
- Init and exit functions
- Licensing considerations
- EXPORT_SYMBOL GPL
- Out-of-tree Makefiles
- Module initialization tools
- Adding modules within the kernel tree
- Kconfig system
- Parameter passing
- Sparse static analysis
Character Drivers
- Architectural overview
- User-kernel interface
- I/O subsystem
- Virtual File System (VFS)
- sysfs (devices, bus, drivers, classes)
- kobject, ktype, and kset structures
- Linux kernel driver model
- Device files
-
Character driver implementation
- Initialization
- Registration
- Open and release operations
- cdev, cdev_add, cdev_del
- Major and minor numbers
- udev, udevmonitor, and udevadm tools
Advanced Character Driver Operations
- ioctl
- Unlocked ioctl
- Compat ioctl
- User space API
- Kernel space API
- Process lifecycle management
- Sleeping and blocking mechanisms
- Sleeping and waking up processes
- Wait queues
- Thundering herd problem
- Poll and select
Kernel Debugging
- General debugging techniques
-
Debugging the kernel
- Binary search using Git
- Built-in kernel debug support
- printk, syslogd, klogd, log levels, rate limiting, debug levels, and selective subsystem debugging
- Debugging via debugfs queries
- Oops debugging and generating oopses
- Magic SysRq Key
- kgdb and kdb
- JTAG debugging
Tracing
- gcov
- lcov
- oprofile
-
ftrace
- nop tracer
- Function tracer
- Sched switch tracer
- Function graph tracer
- Dynamic tracer
- trace-cmd and kernelshark
- perf
- LTTng
Interrupts
- Interrupts versus polling
- Interrupt handling
- Program sections
- Reentrancy
- Events
- Interrupt handlers
- Shared interrupt handlers
- Interrupt flow
- Interrupt control
Deferring Work
- Top halves and bottom halves
- Softirqs
- Tasklets
- Work queues
- Threaded interrupts
Concurrency
- Critical regions and sections
- Atomic operations
- Race conditions
- Synchronization strategies
- Locking techniques
- Locking solutions
- Deadlocks
- Contention
- Identifying what to lock
-
Available synchronization primitives
- Atomic operations
- Spinlocks
- Reader-writer spinlocks
- Semaphores
- Binary semaphores
- Mutexes
- Reader-writer semaphores
- Completion variables
- Seqlocks
- Disabling preemption
- Ordering and barriers
Time
- HZ configuration
- Jiffies
- Large and small delays
- Kernel timers
Hardware I/O
- I/O Ports
- I/O Memory
- Handling 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 considerations
- Opaque types
- Signed versus unsigned char
- Data alignment
- Integral promotion
- Code reuse strategies
- 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 application development
- Intermediate C programming knowledge
- Completion of Embedded GNU/Linux Systems Architecture is strongly recommended, or equivalent understanding of the topics covered therein
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.
