how to debug xen

how to debug xen

[holmes]

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Hi all,
I am new to Xen. I want to debug xen. So I have few questions here. If anybody can help me, I'd appreciate it.
1: My system is ubuntu 8.04. I download the xen-3.4.2 source code from xen website. After I "make world", it will download the linux-2.6.18-xen.hg (kernel?).  Also it will make many other folders (./dist). I found blkfront.c in both ./linux-2.6.18-xen.hg/drivers/xen/blkfront folder and ./dist/install/lib/modules/2.6.18.8-xen/source/drivers/xen/blkfront/ folder. So, what's the difference of the two folders and what are they doing?
2: if I want to log the activities (read/write block) information in domU(winxp), how do I log it? For example, if domU read a block, I therefore print a information into a log file (like "domU read"). Should I change something in blkfront.c file? If so, which one should I change, because there are two blkfront.c.
3: if I want to log the information, I GUESS (not sure) I should use log.debug (or else) to log the info. into some log files. How should I do? Can anyone give me suggestion?
 
Thanks!!
John Huang 

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Re: how to debug xen

[Pasi Kärkkäinen]

On Tue, Feb 01, 2011 at 03:41:02AM +0800, holmes wrote:
>    Hi all,
>    I am new to Xen. I want to debug xen. So I have few questions here. If
>    anybody can help me, I'd appreciate it.
>    1: My system is ubuntu 8.04. I download the xen-3.4.2 source code from xen
>    website. After I "make world", it will download the linux-2.6.18-xen.hg
>    (kernel?).  Also it will make many other folders (./dist). I found
>    blkfront.c in both ./linux-2.6.18-xen.hg/drivers/xen/blkfront folder and
>    ./dist/install/lib/modules/2.6.18.8-xen/source/drivers/xen/blkfront/
>    folder. So, what's the difference of the two folders and what are they
>    doing?


dist/ is the directory where stuff lands after successful build,
ie. you can copy from dist/ to / to install xen.


>    2: if I want to log the activities (read/write block) information in
>    domU(winxp), how do I log it? For example, if domU read a block, I
>    therefore print a information into a log file (like "domU read"). Should I
>    change something in blkfront.c file? If so, which one should I change,
>    because there are two blkfront.c.
>    3: if I want to log the information, I GUESS (not sure) I should use
>    log.debug (or else) to log the info. into some log files. How should I do?
>    Can anyone give me suggestion?
> 

blkfront is the *frontend* driver for Linux, so a Linux domU running 2.6.18-xen
would use it to access the virtual disks.

You need to check blkback (blkbk) driver! That's the one running in dom0
providing virtual disks for vms.

-- Pasi

Re:Re: how to debug xen

[holmes]

Hi Pasi,

Thank you! Can you tell me how to log the activities here? Give me few codes or hints? 
BTW, can I use printf or what else to do the log thing?
Thanks!
At 2011-01-31 15:18:58，"Pasi Kärkkäinen" <pasik@iki.fi> wrote:
>On Tue, Feb 01, 2011 at 03:41:02AM +0800, holmes wrote:
>>    Hi all,
>>    I am new to Xen. I want to debug xen. So I have few questions here. If
>>    anybody can help me, I'd appreciate it.
>>    1: My system is ubuntu 8.04. I download the xen-3.4.2 source code from xen
>>    website. After I "make world", it will download the linux-2.6.18-xen.hg
>>    (kernel?).  Also it will make many other folders (./dist). I found
>>    blkfront.c in both ./linux-2.6.18-xen.hg/drivers/xen/blkfront folder and
>>    ./dist/install/lib/modules/2.6.18.8-xen/source/drivers/xen/blkfront/
>>    folder. So, what's the difference of the two folders and what are they
>>    doing?
>
>
>dist/ is the directory where stuff lands after successful build,
>ie. you can copy from dist/ to / to install xen.
>
>
>>    2: if I want to log the activities (read/write block) information in
>>    domU(winxp), how do I log it? For example, if domU read a block, I
>>    therefore print a information into a log file (like "domU read"). Should I
>>    change something in blkfront.c file? If so, which one should I change,
>>    because there are two blkfront.c.
>>    3: if I want to log the information, I GUESS (not sure) I should use
>>    log.debug (or else) to log the info. into some log files. How should I do?
>>    Can anyone give me suggestion?
>> 
>
>blkfront is the *frontend* driver for Linux, so a Linux domU running 2.6.18-xen
>would use it to access the virtual disks.
>
>You need to check blkback (blkbk) driver! That's the one running in dom0
>providing virtual disks for vms.
>
>-- Pasi
>

Re: Re: how to debug xen

[Jiang Wang]

Hi,

I think you can use xentrace or xenmon. Google them. Following is one
link about them:

http://jianggmulab.blogspot.com/2009/03/xentrace-xenmon.html

Regards,

Jiang

On Mon, Jan 31, 2011 at 3:39 PM, holmes <albert.holmes@163.com> wrote:
> Hi Pasi,
>
> Thank you! Can you tell me how to log the activities here? Give me few codes or hints?
> BTW, can I use printf or what else to do the log thing?
> Thanks!
> At 2011-01-31 15:18:58，"Pasi Kärkkäinen" <pasik@iki.fi> wrote:
>>On Tue, Feb 01, 2011 at 03:41:02AM +0800, holmes wrote:
>>>    Hi all,
>>>    I am new to Xen. I want to debug xen. So I have few questions here. If
>>>    anybody can help me, I'd appreciate it.
>>>    1: My system is ubuntu 8.04. I download the xen-3.4.2 source code from xen
>>>    website. After I "make world", it will download the linux-2.6.18-xen.hg
>>>    (kernel?).  Also it will make many other folders (./dist). I found
>>>    blkfront.c in both ./linux-2.6.18-xen.hg/drivers/xen/blkfront folder and
>>>    ./dist/install/lib/modules/2.6.18.8-xen/source/drivers/xen/blkfront/
>>>    folder. So, what's the difference of the two folders and what are they
>>>    doing?
>>
>>
>>dist/ is the directory where stuff lands after successful build,
>>ie. you can copy from dist/ to / to install xen.
>>
>>
>>>    2: if I want to log the activities (read/write block) information in
>>>    domU(winxp), how do I log it? For example, if domU read a block, I
>>>    therefore print a information into a log file (like "domU read"). Should I
>>>    change something in blkfront.c file? If so, which one should I change,
>>>    because there are two blkfront.c.
>>>    3: if I want to log the information, I GUESS (not sure) I should use
>>>    log.debug (or else) to log the info. into some log files. How should I do?
>>>    Can anyone give me suggestion?
>>>
>>
>>blkfront is the *frontend* driver for Linux, so a Linux domU running 2.6.18-xen
>>would use it to access the virtual disks.
>>
>>You need to check blkback (blkbk) driver! That's the one running in dom0
>>providing virtual disks for vms.
>>
>>-- Pasi
>>
>
>
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