Trace interruption on a linux system

The command strace is mainly for tracing system call. Does someone know the equivalent for tracing interruption like IRQ14...

开发者_开发百科

Thanks

---

strace is only useful for tracing userspace activity. In order to trace interrupts properly you need an in-kernel tracing solution. Check out the following. ftrace is probably your best bet. Note, however, that these have a fairly high learning curve, but that is expected.

• http://lwn.net/Articles/370423/

• http://www.mail-archive.com/linuxkernelnewbies@googlegroups.com/msg02422.html

• http://lttng.org/

• SystemTap is also a good choice.

---

I believe you are looking for SystemTap. You may need to patch your kernel to allow SystemTap to extract the information you want, though. It's kind of a mess.

---

Hardware interrupts may be counted with systemtap (or perf or ftrace):

# stap -e 'global irq; probe kernel.trace("irq_handler_entry") {irq[$irq]<<<1}' -c WORKLOAD-COMMAND

---

You can keep track of the number of interrupts through /proc/interrupts. Without specific kernel hacking that's probably the best you can get from userland. What more would you want to trace?

---

Take a look at oprofile.