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Re: [Qemu-devel] [PATCH 0/3] dataplane: virtio-blk live migration with x


From: yinyin
Subject: Re: [Qemu-devel] [PATCH 0/3] dataplane: virtio-blk live migration with x-data-plane=on
Date: Fri, 19 Jul 2013 13:33:12 +0800

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
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