最新Linuxデバイスドライバ開発応用-修正版-PDF.PDF

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1 Linux Kernel Conference 2004 Linux - / - [email protected] 2004/10/14 Device Drivers Limited 1

2 Device Drivers Limited 2

3 IF Device Drivers Limited 3

4 Linux Device Drivers Limited 4

5 Device Drivers Limited 5

6 (1) UP (Uni Processor) SMP (Symmetric Multi Processor) ASMP (Asymmetric Multiple Processor) SMT (Simultaneous Multi-Threading) Intel Hyper-Threading CMP (Chip Multi Processor) VLIW (Very Long Instruction Word) Device Drivers Limited 6

7 (2) UMA (uniformed memory access) NUMA (non- uniformed memory access) NORMA (no-remote memory access) shared nothing, cluster, grid computer memory cpu1 cpu2 memory cpu3 cpu4 cpu5 cpu6 memory cpu7 cpu8 memory Device Drivers Limited 7

8 CPU UP CMP!? VLIW Transmeta vs. Intel ia64 Device Drivers Limited 8

9 NUMA SMP SMT/HT CMP UP Device Drivers Limited 9

10 UP uop VLIW OS Device Drivers Limited 10

11 SATA PCI-Express x UWB (wireless USB) IO, Storage HotPlug PowerManagement Device Drivers Limited 11

12 Device Drivers Limited 12

13 CPU NUMA, O(1), IO IO uclinux, SELINUX, oprofiler, Device Drivers Limited 13

14 2.6 (2) 2.6 Linux Linux Device Drivers Limited 14

15 HZ(jiffies) jiffies 64bit USB,, IPV6, SYSFS VLM/dm, IPV6, Device Drivers Limited 15

16 HZ(Jiffies) HZ= : jiffies : 10ms 1ms CPU 2.4 LKML 2.6 Device Drivers Limited 16

17 sysfs procfs sysfs 2.6 Device Drivers Limited 17

18 2.6 CPU Device Drivers Limited 18

19 Linux Device Drivers Limited 19

20 sysfs / kobject / libsysfs / udev IO 2.6 Device Drivers Limited 20

21 2.6 *.o *.ko module_init_tools implementation problems initialization problems removal problems Device Drivers Limited 21

22 # Makefile(1) TARGET:= hello.ko all: ${TARGET} hello.ko: hello.c clean: make -C /usr/src/linux-`uname -r` M=`pwd` V=1 modules make -C /usr/src/linux-`uname -r` M=`pwd` V=1 clean obj-m:= hello.o KBUILD_VERBOSE 0 clean-files := *.o *.ko *.mod.[co] *~ make Device Drivers Limited 22

23 # Makefile(2) TARGET:= hello.ko all: ${TARGET} hello.ko: hello1.c hello2.c clean: make -C /usr/src/linux-`uname -r` M=`pwd` V=1 modules make -C /usr/src/linux-`uname -r` M=`pwd` V=1 clean obj-m:= hello.o hello-objs := hello1.o hello2.o clean-files := *.o *.ko *.mod.[co] *~ : Documentation/kbuild/*.txt hello.ko Device Drivers Limited 23

24 sysfs / kobject / libsysfs / udev IO Device Drivers Limited 24

25 tasklet task_queue SpinLock Atomic (SMP) HyperThreading(HT) Device Drivers Limited 25

26 A A B B C C D D Device Drivers Limited 26

27 2.6 softirq tasklet workqueue(schedule_task) task_queue 2.5 Device Drivers Limited 27

28 : tasklet softirq( (softirq) (SpinLock atomic Device Drivers Limited 28

29 workqueue : workqueue workqueue workqueue AIO, BlockIO, GPL Device Drivers Limited 29

30 : SpinLock CPU0 while (lock!= 0); lock=1; Critical Section lock=0; CPU1 while (lock!= 0); lock=1; Critical Section lock=0; Device Drivers Limited 30

31 SpinLock SpinLock 2.4 Intel HT HT while (lock!= 0) while (lock!= 0) while (lock!= 0) ; asm( PAUSE ); if (condition) schedule(); Device Drivers Limited 31

32 SpinLock Hyper Threading SpinLock Test and Set HyperThreading HT monior/mwait Device Drivers Limited 32

33 : Atomic CPU (Lock ) Atomic SMP UP SpinLock 2.6 SpinLock Device Drivers Limited 33

34 Atomic Atomic Atomic 0 True(1) Linux Device Drivers Limited 34

35 Atomic atomic_set atomic_read atomic_add atomic_sub atomic_inc atomic_dec Atomic 3 atomic_inc_and_test +1 atomic_dec_and_test -1 atomic_add_and_test atomic_sub_and_test atomic_test_and_inc atomic_test_and_dec! test_and_set_bit test_and_clear_bit Device Drivers Limited 35

36 SpinLock Atomic SpinLock Atomic Atomic SpinUnLock Device Drivers Limited 36

37 Device Drivers Limited 37

38 (2) # ps ax Device Drivers Limited 38

39 IO Hardware Hardware Hardware Hardware Device Drivers Limited 39

40 FIFO IO Device Drivers Limited 40

41 sysfs / kobject / libsysfs / udev IO Device Drivers Limited 41

42 sysfs sysfs / kobject / udev / libsysfs kobject sysfs udev devfs libsysfs sysfs udev Device Drivers Limited 42

43 IO IO elevator = as(anticipatory) ( ) elevator = deadline IO IO elevator = cfq (Complete Fair Queuing disk I/O scheduler ) elevator = noop IO Device Drivers Limited 43

44 before SpinLock Atomic lock asm() Device Drivers Limited 44

45 Linux Device Drivers Limited 45

46 Device Drivers Limited 46

47 Linux Device Drivers Limited 47

48 2.7 Linus ( CMP Hack Device Drivers Limited 48

49 Device Drivers Limited 49

LinuxDeviceDriver2003-PDF.PDF

LinuxDeviceDriver2003-PDF.PDF Linux Kernel Conference 2003 Linux [email protected] 2003/10/9 Device Drivers Limited 1 Linux 2.6 Device Drivers Limited 2 SpinLock Atomic (SMP) HyperThreading(HT) tasklet task_queue /proc Device Drivers