$B3d$j9~$_$N8eH>It!"(BSoftirq$B!"(BTasklet$B!"(BWork Queue

• $B3d$j9~$_$r6X;_$9$k!#!J3d$j9~$_5v2D!?6X;_$N>uBV$NJ]B8$O!"(BSoftirq $B$N(B $B%O%s%I%i$NCJ3,$G$5$l$F$$$k!#!K(B
• tasklet_vec $B$N%j%9%H$r(B head $B$+$i$?$I$k!#(B tasklet_vec$B!!<+?H$O!"6u$K$9$k!#(B
• $B3d$j9~$_$r5v2D$9$k!#(B($B0J8e!"3d$j9~$_%O%s%I%iEy$+$i list $B$NKvHx$^$G(B list = list->next $B$G%k!<%W(B
• count $B$,(B 0 $B$G$J$$$+$b3NG'$9$k(B
• state $B$,(B TASKLET_STATE_SCHED $B$+3NG'$7$F!"$5$i$K(BTASKLET_STATE_RUN $B$K$9$k!#(B
• Tasklet $B$N%O%s%I%i$r8F$S=P$9(B(t->func(t->data))$B!#(B continue $B$G!" tasklet_trylock() $B$G%m%C%/$,$9!#(B

$B"!(BTasklet$B$NMxMQNc(B

drivers/net/wireless/ath/ath9k/init.c
 565:         tasklet_init(&sc->intr_tq, ath9k_tasklet, (unsigned long)sc);

drivers/net/wireless/ath/ath9k/main.c
 623: irqreturn_t ath_isr(int irq, void *dev)
 624: {
...
 738:                 tasklet_schedule(&sc->intr_tq);
...
 741:         return IRQ_HANDLED;
 744: }

 559: void ath9k_tasklet(unsigned long data)
 560: {
...
 621: }

• $B=i4|2=;~$K!"(Btasklet_init() $B$G9=B$BN$r=i4|2=$7$F$$$k!#(B
• $B%O!<%I%&%'%"$N3d$j9~$_%O%s%I%i(B ath_isr() $B$G(B tasklet_schedule() $B$r(B $B8F$s$G$$$k!#(B
• $B$=$N$&$A$K!"(Bath9k_tasklet() $B$,8F$P$l$k!#(B

$B"#(BWork Queue

• sleep $B$9$kI,MW$,$"$k!#(B
• $B3d$j9~$_%3%s%F%-%9%H$G$O$J$/!"%W%m%;%9%3%s%F%-%9%H$G4X?t$r8F$S=P$7$?$$(B
• $B%a%b%j$r3NJ]$7$?$$(B($B%Z!<%8%"%&%H$N$?$a$K(Bsleep$B$9$k2DG=@-$,$"$k(B)
• $B%;%^%U%)Ey$NF14|=hM}$r9T$&(B

$B"!(BWork Queue$B$N%o!<%+!&%9%l%C%I(B

$B%-%e!<$K$D$J$,$l$k;E;v$O!"(BTasklet $B$N;E;v$H$[$H$s$IF1$8$G!"4X?t$X$N%]%$(B $B%s%?(B func $B$H(B data $B$+$i$J$k!#=hM}$N

Work Queue $B%G%U%)%k%H$N%o!<%+!&%9%l%C%I$O!"(Bevents/n (n$B$O%W%m%;%C%5HV9f(B) $B$H$h$P$l!"%W%m%;%C%5$4$H$K:n$i$l$k!##1$D$N%9%l%C%I$G!"MM!9$JMW5a85$N;E(B $B;v$r$3$J$9!#(B $BFH<+$N%o!<%+!&%9%l%C%I$r:n$k$3$H$b$G$-$k!#(B

F   UID   PID  PPID PRI  NI    VSZ   RSS WCHAN  STAT TTY        TIME COMMAND
4     0     1     0  15   0   2160   676 stext  Ss   ?          0:02 init [5]
...
1     0     8     1  10  -5      0     0 worker S<   ?          0:00 [events/0]
1     0     9     1  10  -5      0     0 worker S<   ?          0:00 [events/1]
...
$ 

$B"!(Bwork_struct$B9=B$BN(B

include/linux/workqueue.h
  18: typedef void (*work_func_t)(struct work_struct *work);
...
  79: struct work_struct {
  80:         atomic_long_t data;
  81:         struct list_head entry;
  82:         work_func_t func;
...
  86: };

• entry: $B%-%e! func: $B%O%s%I%i(B

$B"!(BWork Queue $B%O%s%I%i(B

$B"!(BWork $B$N

$B"!(Bflush_scheduled_work()

void h(void) {
   ....
}

irqreturn_t irq_handler(int irq, void *dev) {
    /*$B6uMs(B(d)*/
    return IRQ_HANDLED;
}