Linux Kernel Architecture

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kernel, introduction to(continued)

kernel, introduction to(continued)

page tables, 11–13

processes, task switching, and

scheduling, 4

pros/cons of, 28–29

summary, 33

system calls, 17

tasks of, 2–3

timing, 16

Unix processes, 4–7

kernel daemons.Seekernel threads

kernel development process

academia and, 1281–1282

coding styles, 1274–1276

command chain, 1269

community processes, 1284–1287

development cycle, 1269–1272

documenting code, 1276–1277

examples of improvements to Linux,

1282–1284

online resources and, 1272–1273

overview of, 1267–1268

patches and, 1273

portability, 1276

submission and review processes,

1277–1281

summary, 1287

technical issues and, 1273

tree structure and, 1268

kernel mode, 847–891

calling flow handler routines, 870–872

calling high-level ISR, 872–873

completions, 887–888

controller hardware settings, 860–861

data structures, 853–856

entry and exit tasks, 850–852

flow handling, 861–864

freeing IRQs, 865–866

handler function representation, 859–860

hardware IRQs, 849–850

implementing handler routines, 873–874

interrupt flow handling, 860

interrupt handlers, 852

interrupt types, 848–849

IRQ controller abstraction, 856–859

IRQ stacks, 869

overview of, 847

preemptive multitasking and, 40–41

privilege levels and, 8–10

processing interrupts, 850

registering interrupts, 866

registering IRQs, 864–865

servicing IRQs, 866–867

softIRQ daemon, 878–879

software interrupts (softIRQs), 875–877

starting softIRQ processing, 877–878

summary, 889–891

switching between user and kernel mode,

833, 867–869

tasklets, 879–882

wait queues, 882–887

work queues, 889–891

kernel page faults, 341–343

kernel preemption

overview of, 41

scheduler, 127–131

kernel space

copying data between userspace and,

344–345

defined, 11

divisions of virtual address space,

7–8

kernel threads, 77–79

address spaces and, 9–10

implementing, 78–79

tasks performed by, 77

types of, 77–78

kfree

freeing memory, 259

freeing objects, 280

general caches and, 283

implementing, 285

KGDB, 1172–1173

KiB, units of measurements, 7