Hi, All
 This is a patch for xentrace.c.
This routine checks the trace buffer is initialized or not.
If not, the trace buffer is initialized by using this patch.
This is avoiding following message.
ERROR: Failure to get trace buffer pointer from Xen (22 = Invalid argument)
This routine is based on the specification of 
the trace buffer control function trace.c/tb_control().
The function checks the trace buffer is initialized or not 
in line 183.
If not, this routine stops working.
Of course, this problem is also solved by using tbctl [0|1].
But this problem is already solved by xenmon.py without using tbctl command.
This code is just moved from 
tools/xenmon/xenbaked.c(get_tbuf and misc settings)
I hope these two tools (xenmon.py and xentrace) share the functions.
Signed-off-by: Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>
Thanks,
A.Sakai 

Attachment: xentrace.patch
Description: Binary data

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