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