Xen devel - Apr 2007 - Does xentrace write into buffers by default?

Hello,
I have a question about the way Xentrace takes a trace.
In previous versions of Xen, I took a trace by setting the size of buffers, 
activating them and writing the information into a file (optional).
setsize 20
tbctl 1
xentrace /tmp/xentrace.dat

Now I''m using xen-unstable and I see that setsize is already integrated
in
xentrace command.

My question is: does start/stop buffer is integrated into the xentrace too?
I mean, does xen write trace information into buffers by default or it starts 
writing them after the command "xentrace /tmp/xentrace.dat".

If it writes into buffers by default, how can I control it (turn on/off 
buffers).

Best regards,
Parissa. 

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> I mean, does xen write trace information into buffers by default or it
starts
> writing them after the command "xentrace /tmp/xentrace.dat".
Tracing keeps happening, irrespective of whether you run the xentrace
user program or not.
> If it writes into buffers by default, how can I control it (turn on/off
> buffers).
Set the event mask to 0.

Diwaker
-- 
Web/Blog/Gallery: http://floatingsun.net/blog

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Hello Parissa,

On Thu, 2007-04-05 at 18:43 -0400, Parissa Heidari
wrote:
> Hello,
> I have a question about the way Xentrace takes a trace.
> In previous versions of Xen, I took a trace by setting the size of buffers,
> activating them and writing the information into a file (optional).
> setsize 20
> tbctl 1
> xentrace /tmp/xentrace.dat
> 
> Now I''m using xen-unstable and I see that setsize is already
integrated in
> xentrace command.
> 
> My question is: does start/stop buffer is integrated into the xentrace too?
> I mean, does xen write trace information into buffers by default or it
starts
> writing them after the command "xentrace /tmp/xentrace.dat".
The trace buffers are initialized and tracing starts when you set the
trace buffer size. This happens when you call "xentrace /tmp/foo" the
first time.

Thomas


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Operating System Research Center
email: thomas.friebel@amd.com
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