On Tue, Mar 21, 2017 at 12:50:39PM +0100, Peter Krempa wrote:
On Tue, Mar 21, 2017 at 12:06:25 +0100, Martin Kletzander wrote:On Mon, Mar 20, 2017 at 02:11:21PM +0100, Thibaut SAUTEREAU wrote: > Hello, > > I cannot find a way to retrieve PIDs of QEMU instances from libvirt domains' > IDs (I'm using libvirt C API). I recognize it sounds like a bad idea doing so > (and I know PIDs are explicitly made not available, as I gathered from the > source code and on your IRC channel) but I need that to use the perf_event_open > syscall in order to gather statistics on my QEMU/KVM guests. I also know > libvirt now supports some perf events but only a few and I need more. I could > submit patches to add them and I will definitely consider that but in the > meantime...Looks like you are looking for: http://libvirt.org/formatdomain.html#elementsPerf and http://libvirt.org/html/libvirt-libvirt-domain.html#virDomainGetPerfEvents> > What would be the best way to get those PIDs? I tried using the XML file but > PID is hidden in there too. I took a look at QEMU Machine Protocol. Now I'm > going to walk /proc and match on guests names but it is not that elegant. > Any ideas?Just to re-iterate. We hide it because users should not fiddle with the VMs behind our backs.> `ps aux | grep $UUID | grep -v grep` ??This will obviously work, but we won't give you an elegant way since we don't want you to know the pid.
I mentioned that since Thibaut knows about why we hide that, how to get the current perf events as well as how to add new ones (at least according to how I understood the message).
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