From mboxrd@z Thu Jan 1 00:00:00 1970 From: vikram186@gmail.com (Vikram Narayanan) Date: Mon, 16 May 2011 21:26:19 +0530 Subject: Fwd: how to debug kernel in qemu using ubuntu image In-Reply-To: References: Message-ID: <1305561379.2944.3.camel@ubuntu.ubuntu-domain> To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.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. 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