Hi Steven, (2013/10/15 6:26), Steven Rostedt wrote:
On Fri, 13 Sep 2013 11:06:27 +0900 Yoshihiro YUNOMAE <[email protected]> wrote:<How to use> 1. Run virt-server on a host # trace-cmd virt-server 2. Make guest domain directory # mkdir -p /tmp/trace-cmd/virt/<domain> # chmod 710 /tmp/trace-cmd/virt/<domain> # chgrp qemu /tmp/trace-cmd/virt/<domain>Quick comment. I think the above should be done by trace-cmd. At least have options for it like: trace-cmd virt-server -d /tmp/trace-cmd/virt/domain -m 710 -g qemu Perhaps default some of those, and have trace-cmd print out: Process Directory: /tmp/trace-cmd/virt/domain Directory permission: 0710 Group: qemu
OK. As you say, when we know domains which we will boot, trace-cmd should make those automatically. So, I'll add this feature. Note that if we don't know domains when we boot virt-sevrer, we must make those manually now. In this patch set, virt-server always uses /tmp/trace-cmd/virt, so we had better indicate only the domain name with d option, I think. trace-cmd virt-server -d domain -m 710 -g qemu What do you think about this? Thanks, Yoshihiro YUNOMAE
OK, now to look at the actual code ;-) -- Steve3. Make FIFO on the host # mkfifo /tmp/trace-cmd/virt/<domain>/trace-path-cpu{0,1,...,X}.{in,out} 4. Set up of virtio-serial pipe of a guest on the host Add the following tags to domain XML files. # virsh edit <domain> <channel type='unix'> <source mode='connect' path='/tmp/trace-cmd/virt/agent-ctl-path'/> <target type='virtio' name='agent-ctl-path'/> </channel> <channel type='pipe'> <source path='/tmp/trace-cmd/virt/<domain>/trace-path-cpu0'/> <target type='virtio' name='trace-path-cpu0'/> </channel> ... (cpu1, cpu2, ...) 5. Boot the guest # virsh start <domain> 6. Execute "record --virt" on the guest # trace-cmd record --virt -e sched*-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
-- Yoshihiro YUNOMAE Software Platform Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: [email protected] -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
