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H A Dsimple.c454e202d Sun Oct 30 22:29:04 CDT 2011 Mark Wu <wudxw@linux.vnet.ibm.com> trace: Add wildcard trace event support

A basic wildcard matching is supported in both the monitor command
"trace-event" and the events list file. That means you can enable/disable
the events having a common prefix in a batch. For example, virtio-blk trace
events could be enabled using:
trace-event virtio_blk_* on

Signed-off-by: Mark Wu <wudxw@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>