Lesson 07

[megaparanoik]

Added a sysfs module code based on sysfs module from Lesson 05.
To build the module you should first export the BUILD_KERNEL environment variable, that points to a kernel directory.

The sysfs module creates own class case_converter in /sys/class
The class includes such attributes: alphabetic, converted, numeric, processed, used which give the work statistic of the module.
The buffer attribute is an RW exchange buffer.

The module provides different memory management models, a certain model is selected using the "mode" param while the module loaded.
mode=0 (1st item Readme.) - Slab memory allocator with a single slab-buffer, which allocates at writing into the buffer attribute and releases at reading from the buffer attribute.
mode=1 (2nd item Readme) - Slab memory allocator with multiplay slab-buffers, which allocated at each writing into the buffer attribute and released at unloading the module.
mode=2 (3rd item Readme) - Memory pool with predefined reserved buffers based on slab allocator. All module functionality corresponds to mode=1
mode=3 (4th item Readme) - Memory pool with resizable buffers based on slab allocator.