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4 Trace agent is a user tool for sending trace data of a guest to a Host in low
6  - splice a page of ring-buffer to read_pipe without memory copying
7  - splice the page from write_pipe to virtio-console without memory copying
8  - write trace data to stdout by using -o option
13  2) Create a read/write thread per CPU. Each thread is bound to a CPU.
18  5) The read/write threads start to read trace data from ring-buffers and
19     write the data to virtio-serial.
21     stop to read trace data.
38 To use this trace agent for virtio-trace, we need to prepare some virtio-serial
42  virtio-trace uses virtio-serial pipe as trace data paths as to the number
54  Add qemu option to use virtio-serial pipe.
68 If you manage guests with libvirt, add the following tags to domain XML files.
69 Then, libvirt passes the same command option to qemu.
82 Here, chardev names are restricted to trace-path-cpuX and agent-ctl-path. For
112 4) Start to read trace data by ordering from a host
113  A host injects read start order to the guest via virtio-serial.
116 5) Stop to read trace data by ordering from a host
117  A host injects read stop order to the guest via virtio-serial.