Hello,

yes I can :-)

https://www.brendangregg.com/

on the page you will find a link to his 'Linux Performance' book.
On the page are also further Infos about the topic 'performance'.
you will have to dive into the stuff.
(e)BPF is a "MIGHTY" area.
But you can pull out nearly 'every' meta data from the kernel.

Also for your interest:

https://www.brendangregg.com/Slides/SREcon2022_ComputingPerformance/

Computing Performance 2022 and what is on the horizon!

have fun!

Slainte

Thanks Marco for the response. Is it possible to collect these vm stats from the host KVM hypervisor ? Also can u give the link for this book ?

Thanks
Happy holidays

On Monday, December 26, 2022, Marko Horn <weber@zbfmail.de> wrote:
> Hi,
>
> I think best way is to use BPF to collect stats. I did this in past in combination with 'perf'.
> Theres a nice book of Brandon Greg from Netflix Networks where he describe how to do this and how to write own scripts.
>
> merry Xmas
>
> marko
>
> ________________________________
>
> 26.12.2022 11:34:20 Gk Gk <ygk.kmr@gmail.com>:
>
> Hi All,
> I am trying to collect memory, disk and network stats for a VM on kvm host. It seems that the statistics are not matching what the OS inside the VM is reporting. Why is this discrepancy ?
> Is this a known bug of libvirt ? Also I heard that libvirt shows cumulative figures for these measures ever since the VM was created.  Also I tested by creating a new vm and comparing the stats without a reboot . Even in this case, the stats dont agree.  Can someone help me here please ?
>
> Thanks
> Kumar
>