Re: qemu polling KVM_IRQ_LINE_STATUS when stopped

[Andi Kleen <ak@xxxxxxxxxxxxxxx>]

> Because the polling time is zero here, and fd=7 has POLLIN, it seems
> that QEMU is continuously scheduling a callback (a timer with a deadline
> in the past, or a bottom half).  Can you perhaps attach gdb and see what
> callback it is?

There seem to be multiple.

The ioctl appears to be the PIC timer

  - 6.36% __GI___ioctl                                                                                                                                ▒
           kvm_vm_ioctl                                                                                                                                   ▒
           kvm_set_irq                                                                                                                                    ▒
           kvm_pic_set_irq               

It does something with glib (windows are all closed BTW)

-    2.83%  libglib-2.0.so.0.5200.3   [.] g_main_context_check                                                                                              ▒
   - 2.81% g_main_context_check                                                                                                                             ▒
      - 2.60% main_loop_wait                                                                                                                                ▒
           main                                                                                                                                             ▒
           __libc_start_main                                                                                                                                ▒
           _start                                    

And some AIO is going on, not sure what triggers that.

     1.96% aio_ctx_check                                                                                                                                    ▒

-Andi