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Re: [Xen-devel] Is this a bug of xentrace?

To: George Dunlap <dunlapg@xxxxxxxxx>
Subject: Re: [Xen-devel] Is this a bug of xentrace?
From: Hui Kang <hkang@xxxxxxxxxxxxx>
Date: Mon, 11 May 2009 12:46:09 -0400
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Ok, I know that 0x00007fff is for the idle domain, because when I use xenmon it has the same idle domain. However, I have one guest domain running an infinite loop program (while{ int temp = 676*1.5;}). This guest domain is listed by "xm list". But xenmon and xentrace can not detect this guest domain. However, when I stop the program in that domain, xentrace and xenmon can detect it. Why?
Thanks.

- Hui

Hui Kang wrote:
Yes, it is 0x00007fff. This is one line  in the parsed trace file.
CPU1 962569711226060 (+ 574) switch_infnext [ new_domid = 0x00007fff, time = 14321, r_time =30000000 ] When I use "xm list", it shows the domain id is 5. There are only two domains on the host.
Can any one point out what does "0x00007fff" this number mean? Thanks.

- Hui

George Dunlap wrote:
Are you sure that's not 0x7fff? (Three f's, not four?)  0x7fff is the
domain ID of the idle domain (scheduled when there is no other work on
the system to do).

 -George

On Sat, May 9, 2009 at 7:56 PM, Hui Kang <hkang@xxxxxxxxxxxxx> wrote:
Hi,
I am using xentrace to trace the events of guest domains on a host physical
machine.  In the parsed trace file,
if the guest domain is created on the host machine, then the entry is good
switch_infprev    [ old_domid = 0x00000002
// the guest domain has a id of 2.
switch_infnext    [ new_domid = 0x00000000

However, if the guest domain is migrated from another host machine, the
parsed trace file shows
switch_infprev    [ old_domid = 0x00007ffff
// the guest domain has a id of 2.
switch_infnext    [ new_domid = 0x00000000
Even the domain Id is 2, it shows 0x00007ffff.
Can anyone explain this? Thanks.




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