Re: [PATCH] x86/kvm: Show guest system/user cputime in cpustat

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 03/11/2010 09:20 AM, Sheng Yang wrote:
Currently we can only get the cpu_stat of whole guest as one. This patch
enhanced cpu_stat with more detail, has guest_system and guest_user cpu time
statistics with a little overhead.

Signed-off-by: Sheng Yang<sheng@xxxxxxxxxxxxxxx>
---

This draft patch based on KVM upstream to show the idea. I would split it into
more kernel friendly version later.

The overhead is, the cost of get_cpl() after each exit from guest.

This can be very expensive in the nested virtualization case, so I wouldn't like this to be in normal paths. I think detailed profiling like that can be left to 'perf kvm', which only has overhead if enabled at runtime.

For example you can put the code to note the cpl in a tracepoint which is enabled dynamically.

--
error compiling committee.c: too many arguments to function

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux