如何定义和触发我自己的新的softirq Linux内核？

问题描述

我想创建Linux内核我自己的软中断。是不是这样做的正确方法：

I would like to create my own softirq in linux kernel. Is it the right way to do that:

在的init 模块的我想触发软中断从我会加入到呼叫

In the init of the module I would like to trigger the softirq from I'll add a call to:

394 void open_softirq(int nr, void (*action)(struct softirq_action *))
395 {
396         softirq_vec[nr].action = action;
397 }

而在片段，我想提高我的softirq将添加一个调用 raise_softirq 功能：

379 void raise_softirq(unsigned int nr)
380 {
381         unsigned long flags;
382 
383         local_irq_save(flags);
384         raise_softirq_irqoff(nr);
385         local_irq_restore(flags);
386 }

和添加我的新软中断在

411 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
412    frequency threaded job scheduling. For almost all the purposes
413    tasklets are more than enough. F.e. all serial device BHs et
414    al. should be converted to tasklets, not to softirqs.
415  */
416 
417 enum
418 {
419         HI_SOFTIRQ=0,
420         TIMER_SOFTIRQ,
421         NET_TX_SOFTIRQ,
422         NET_RX_SOFTIRQ,
423         BLOCK_SOFTIRQ,
424         BLOCK_IOPOLL_SOFTIRQ,
425         TASKLET_SOFTIRQ,
426         SCHED_SOFTIRQ,
427         HRTIMER_SOFTIRQ,
428         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
429         MY_NEW_SOFTIRQ
430         NR_SOFTIRQS
431 };

和这里：

 60 char *softirq_to_name[NR_SOFTIRQS] = {
 61         "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL",
 62         "TASKLET", "SCHED", "HRTIMER", "RCU", "MY_NEW_SOFTIRQ"
 63 };

的问题：

• 我说得对还是我错过了什么？


• 是不是这样做的正确方法？任何其他的选择吗？



推荐答案

如果您想内核打补丁并重新编译它，你正在做的也许是对的（除非你应该RCU_SOFTIRQ之前移动）。

If you want to patch the kernel and recompile it, you are doing probably right (except you should move it before RCU_SOFTIRQ).

另外，IOW如果你想要做一个内核模块中，你必须使用微进程，它是基于软中断，做一些软中断上下文：

Otherwise, IOW if you want to do it in a kernel module, you have to use tasklet, which is based on SoftIRQ, to do something in SoftIRQ context:

tasklet_init（）用来初始化你的钩子。

tasklet_init() is used to init your hook.

tasklet_schedule（）来安排您注册微进程。

tasklet_schedule() to schedule the tasklet you register.

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