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Re: [Qemu-discuss] [Qemu-devel] Libvirt add ftrace option

From: Daniel P. Berrange
Subject: Re: [Qemu-discuss] [Qemu-devel] Libvirt add ftrace option
Date: Tue, 16 Aug 2016 15:35:09 +0100
User-agent: Mutt/1.6.2 (2016-07-01)

On Tue, Aug 16, 2016 at 07:54:50PM +0530, Gadre Nayan wrote:
> Hi,
> I have setup the merging of traces from Guest QEMU and Host using the
> TSC_OFFSET. So I would like to work with ftrace backend of QEMU. So
> how can I add this option in libvirt tools to enable ftrace backends
> with my custom qemu source built using --enable-trace-backends=ftrace.
> I would have to make changes to virt-install python script in the
> virt-manager tools for starters ( to parse the trace options :). Where
> else ?

The need to modify the downstream tools to statically configure
tracing parameters for VMs is exactly why we don't want to support
things like ftrace in libvirt and recommend use of fully dymamic
tracing like dtrace/systemd/ltt-ust.

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