On 07/06/2012 09:22 PM, Andrew Theurer wrote:
> On Fri, 2012-07-06 at 15:42 +0800, Xiao Guangrong wrote:
>> On 07/06/2012 05:50 AM, Andrew Theurer wrote:
>>> I, and I expect others, have a keen interest in knowing how often we
>>> exit for PLE, and also how often that includes a yielding to another
>>> vcpu. The following adds two more counters to kvmstat to track the
>>> exits and the vcpu yields. This in no way changes PLE behavior, just
>>> helps us track what's going on.
>>>
>>
>> Tracepoint is a better choice than the counters you used. :)
>
> Xiao, is kvmstat considered to be deprecated? Or are debug stats like
> this just generally favored to be processed via something like perf
> instead of debugfs?
Andrew, please refer to Documentation/feature-removal-schedule.txt,
it says:
What: KVM debugfs statistics
When: 2013
Why: KVM tracepoints provide mostly equivalent information in a much more
flexible fashion.
You can use tracepoints instead of your debugfs-counters in this patch.
> Should we be removing kvmstat?
>
Some months ago, i implemented 'perf kvm-events' which can analyse kvm
events more smartly, the patchset can be found at:
https://lkml.org/lkml/2012/3/6/86
Avi said it may instead of kvmstat, but i am too busy to update this
patchset. :)
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