Detect Memory Leak

• use kmemleak subsystem

1. enable kmemleak module
2. insert kmemleak module to test

Memory Allocate

• kmalloc don't guarantee physical continuous memory

• dma buffer: use alloc_pages_exact

• reserved pages

• config_kmemcheck=y

• virtual address-->swap out

• irq, non-irq context

• kernel lock

bottom half:

• workq --> non-irq context

• tasklet --> irq context

• execute_in_process_context

preempt

• need to have different priority for each process
• support multi-processor and SMP to increase performance