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Unnecessary events option of the trace argument with UST backend
When running configure with the --enable-trace-backends=ust option the user should not have to specify a the "events" and "file" options because they are not used with that tracing framework.
Right now, in order the use this option the need to specify a dummy events file.
This fails:
$> qemu-system-x86_64 -hda debian_wheezy_amd64_standard.qcow2 -trace -m 512
qemu-system-x86_64: -trace -m: Invalid parameter '-m'
This works:
$> qemu-system-x86_64 -hda debian_wheezy_amd64_standard.qcow2 -trace events=dummy-events.txt -m 512
VNC server running on `127.0.0.1:5900'
I am using version:
$> qemu-system-x86_64 --version
QEMU emulator version 2.1.90, Copyright (c) 2003-2008 Fabrice Bellard
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