hi, stefan:
I use systemtap to test this patch,the migration will success. But I
found the dataplane will start again after migration start. the
virtio_blk_handle_output will start dataplane.
virtio_blk_data_plane_stop pid:29037 tid:29037
0x6680fe : virtio_blk_data_plane_stop+0x0/0x232
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x667da2 : virtio_blk_data_plane_destroy+0x33/0x70
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x66a2e4 : virtio_blk_migration_state_changed+0x7c/0x12d
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x7740f4 : notifier_list_notify+0x59/0x79
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a5b16 : migrate_fd_connect+0xc6/0x104
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a3dba : tcp_wait_for_connect+0x6e/0x84
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x76c755 : wait_for_connect+0x170/0x19a
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a2e2c : qemu_iohandler_poll+0xec/0x188
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a3834 : main_loop_wait+0x92/0xc9
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x630083 : main_loop+0x5d/0x82 [/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x636954 : main+0x3666/0x369a [/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x37cf01ecdd [/lib64/libc-2.12.so+0x1ecdd/0x393000]
virtio_blk_data_plane_start pid:29037 tid:29037
0x667ddf : virtio_blk_data_plane_start+0x0/0x31f
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x669802 : virtio_blk_handle_output+0x9c/0x118
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x6ac6ff : virtio_queue_notify_vq+0x92/0xa8
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x6ae128 : virtio_queue_host_notifier_read+0x50/0x66
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x6ae1bb : virtio_queue_set_host_notifier_fd_handler+0x7d/0x93
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x59cdf1 : virtio_pci_set_host_notifier_internal+0x132/0x157
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x59e98c : virtio_pci_set_host_notifier+0x73/0x8e
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x6682a8 : virtio_blk_data_plane_stop+0x1aa/0x232
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x667da2 : virtio_blk_data_plane_destroy+0x33/0x70
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x66a2e4 : virtio_blk_migration_state_changed+0x7c/0x12d
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x7740f4 : notifier_list_notify+0x59/0x79
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a5b16 : migrate_fd_connect+0xc6/0x104
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a3dba : tcp_wait_for_connect+0x6e/0x84
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x76c755 : wait_for_connect+0x170/0x19a
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a2e2c : qemu_iohandler_poll+0xec/0x188
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x5a3834 : main_loop_wait+0x92/0xc9
[/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x630083 : main_loop+0x5d/0x82 [/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x636954 : main+0x3666/0x369a [/root/dataplane/qemu/x86_64-softmmu/qemu-kvm]
0x37cf01ecdd [/lib64/libc-2.12.so+0x1ecdd/0x393000]
systemtap scripts:
probe
process("/root/dataplane/qemu/x86_64-softmmu/qemu-kvm").function("virtio_blk_data_plane_start")
{
printf("virtio_blk_data_plane_start pid:%d tid:%d\n",pid(),tid())
print_ubacktrace();
}
probe
process("/root/dataplane/qemu/x86_64-softmmu/qemu-kvm").function("virtio_blk_data_plane_stop")
{
printf("virtio_blk_data_plane_stop pid:%d tid:%d\n",pid(),tid())
print_ubacktrace();
}
Yin Yin
yin....@cs2c.com.cn
