Re:Re: how to debug xen

[holmes <albert.holmes@163.com>]

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
>