Fwd: how to debug kernel in qemu using ubuntu image

Fwd: how to debug kernel in qemu using ubuntu image

[Vikram Narayanan]

> Hello all,
> 
> I asked my question in "linux kernel" mailing list, and I was
> suggested to forward it to this mailing list.
> 
> I'm using linux-0.2.img image(which is a light linux image) to debug
> kernel using Qemu. I'm working on IO schedulers' optimization. As Qemu
> boots kernel, IO scheduler sends read requests to disk. Also by
> entering commands such as 'ls', it sends read requests. I'm looking
> for a way to send write requests. Thus I thought that using a
> benchmark which sends both read and write requests, is suitable, but
> as linux-0.2.img is a very simple and light image, it is almost
> impossible to setup heavy benchmarks on it. So I want to use an ubuntu
> image instead. But I don't know where I should see kernel printks.
kernel printk's can be seen from the dmesg output. 
Just type dmesg in your shell. 
You can also see that in /var/log/syslog 

Hope it helps,
Vikram

Fwd: how to debug kernel in qemu using ubuntu image

[Amirali Shambayati]

That was helpful, thanks a lot.

On Mon, May 16, 2011 at 8:26 PM, Vikram Narayanan <vikram186@gmail.com> wrote:
>> Hello all,
>>
>> I asked my question in "linux kernel" mailing list, and I was
>> suggested to forward it to this mailing list.
>>
>> I'm using linux-0.2.img image(which is a light linux image) to debug
>> kernel using Qemu. I'm working on IO schedulers' optimization. As Qemu
>> boots kernel, IO scheduler sends read requests to disk. Also by
>> entering commands such as 'ls', it sends read requests. I'm looking
>> for a way to send write requests. Thus I thought that using a
>> benchmark which sends both read and write requests, is suitable, but
>> as linux-0.2.img is a very simple and light image, it is almost
>> impossible to setup heavy benchmarks on it. So I want to use an ubuntu
>> image instead. But I don't know where I should see kernel printks.
> kernel printk's can be seen from the dmesg output.
> Just type dmesg in your shell.
> You can also see that in /var/log/syslog
>
> Hope it helps,
> Vikram
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



-- 
Amirali Shambayati
Bachelor Student
Computer Engineering Department
Sharif University of Technology
Tehran, Iran

Fwd: how to debug kernel in qemu using ubuntu image

[Amirali Shambayati]

---------- Forwarded message ----------
From: Amirali Shambayati <amirali.shambayati@gmail.com>
Date: Tue, May 10, 2011 at 3:11 PM
Subject: how to debug kernel in qemu using ubuntu image
To: Linux Kernel <linux-kernel@vger.kernel.org>


Hello all,

I asked my question in "linux kernel" mailing list, and I was
suggested to forward it to this mailing list.

I'm using linux-0.2.img image(which is a light linux image) to debug
kernel using Qemu. I'm working on IO schedulers' optimization. As Qemu
boots kernel, IO scheduler sends read requests to disk. Also by
entering commands such as 'ls', it sends read requests. I'm looking
for a way to send write requests. Thus I thought that using a
benchmark which sends both read and write requests, is suitable, but
as linux-0.2.img is a very simple and light image, it is almost
impossible to setup heavy benchmarks on it. So I want to use an ubuntu
image instead. But I don't know where I should see kernel printks.

Thanks in advance
Regards,
--
Amirali Shambayati
Bachelor Student
Computer Engineering Department
Sharif University of Technology
Tehran, Iran



-- 
Amirali Shambayati
Bachelor Student
Computer Engineering Department
Sharif University of Technology
Tehran, Iran