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Course Outline
Introduction
- A brief history of GNU/Linux
- Licensing
- Kernel versioning
- Release cycles
- Kernel trees
- Mainline
- Kernel versus user space
- Mechanism versus policy
- Alternatives to kernel drivers
- RTOS versus Linux
Memory Management
- Virtual memory versus physical memory
- Memory allocation in the kernel
- Pages
- Zones
- APIs
- Slab
Kernel Patches
- Lifecycle
- Git
- Kernel source
- Creating patches
- Checking patches
- Fixing patches
- Submitting patches
- Audited code
Kernel Modules
- Obtaining kernel sources
- Configuring, building, and installing
- Device drivers (statically linked or loaded at runtime)
- Init and exit functions
- Licensing
- EXPORT_SYMBOL GPL
- Out-of-tree Makefiles
- Module-init-tools
- Modules within the kernel tree
- Kconfig
- Parameter passing
- Sparse
Character Drivers
- Architecture
- User and kernel interfaces
- I/O subsystem
- VFS
- sysfs (devices, bus, drivers, classes)
- kobject, ktype, and kset
- Linux kernel driver model
- Device files
-
Character drivers
- Initialization
- Registration
- Open and release
- cdev, cdev_add, cdev_del, and others
- Major and minor numbers
- udev, udevmonitor, and 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
- Poll and select
Kernel Debugging
- Debugging basics
-
Debugging the kernel
- Binary search with Git
- Debugging support provided by the kernel
- printk, syslogd, klogd, log levels, rate limiting, debug levels, and selective subsystem debugging
- Debugging via debugfs queries
- Oops debugging and asserting oops
- Magic SysRq key
- kgdb and kdb
- JTAG
Tracing
- gcov
- lcov
- oprofile
-
ftrace
- No-op tracer
- Function tracer
- Schedule switch tracer
- Function graph tracer
- Dynamic tracer
- trace-cmd and kernelshark
- perf
- LTTng
Interrupts
- Interrupts versus polling
- Interrupts
- Program sections
- Reentrancy
- Events
- Interrupt handlers
- Shared interrupt handlers
- Interrupt flow
- Interrupt control
Deferring Work
- Top and bottom halves
- Softirqs
- Tasklets
- Work queues
- Threaded interrupts
Concurrency
- Critical regions and sections
- Atomic operations
- Race conditions
- Synchronization
- Locking
- Locking solutions
- Deadlocks
- Contention
- What to lock?
-
What can be used?
- Atomic operations
- Spin locks
- Reader-writer spin locks
- Semaphores
- Binary semaphores
- Mutexes
- Reader-writer semaphores
- Completion variables
- Sequential locks
- Disabling preemption
- Ordering and barriers
Time
- HZ
- 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() and get_user()
- copy_to_user() and copy_from_user()
- Kernel I/O
- Memory mapping
- procfs
- sysfs
- debugfs
- relayfs
- Netlink
- ioctl
Portability
- Word size
- Opaque types
- Signed and unsigned char
- Data alignment
- Integral promotion
- Code reuse
- Endianness
- System tick
- Page size
- Instruction ordering
- SMP, preemption, and high memory
Unless otherwise noted, the 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 C programming knowledge
- Attendance at Embedded GNU/Linux Systems Architecture is strongly recommended beforehand, or you should have 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.
