[libvirt-users] Get PID of a domain's QEMU instance from its domain ID

[Martin Kletzander]

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...
>
>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?
>

`ps aux | grep $UUID | grep -v grep` ??

>Thanks,
>
>Thibaut S.
>
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