Hi, All!
This is a patch which needs discussion.
Currently xc_tbuf_enable assumed tb_init_done = 0.
But Sometimes already on
For example(xenmon.py(xenbaked) and xentrace).
These two programs assues tb_init_done =0 at start time.
Currently xenbaked care the problem by setting tb_init_done=0 at exit time.
But xentrace does not care the problem.
Then error occured!(Cannot see the trace buffer.)
I added a code in xc_tbuf_enable to permit tb_init_done=1.
And I added to check trace buffer region is already allocated or not
by using xc_tbuf_get_size.
But This solution problem remains,
1) It cannot change the trace buffer size by using xc_tbuf_enable
If we do, we need to add more code to freeing xen buffer.
As other option.(at application layer)
Adding previous command tbctl.
This command switches tb_init_done =0 and 1.
Comments are appreciated.
This problem occured in following steps.
1)xentrace
tb_init_done = 1
2)xentrace (problem occured at xc_tbuf_enable see above)
After xentrace work, this problem occured.
Signed-off-by: Atsushi SAKAI <sakaia@jp.fujitsu.com>
Thanks,
Atsushi Sakai
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