Some newbie questions

[Avi Kivity]

On 08/25/2016 08:37 PM, David Smith wrote:
> On 08/25/2016 11:21 AM, Avi Kivity wrote:
>> Hi,
>>
>> Should I wait for ongoing improvement here, or shall I look elsewhere
>> for my tracing needs?
>>
>> It would be a pity (for me) if I have to find another solution, because
>> systemtap has all the expressiveness and integration I need.  But it has
>> a dramatic impact on my application runtime.
>>
>> I was able to extract some useful data with perf probe/perf record, but
>> as soon as I need to qualify a probe point with runtime information,
>> perf falls short.
> As Frank mentioned in a previous email, it might be possible for us to
> switch to using straight kprobes instead of syscall tracing to handle
> mmap tracing. In your use case of calling epoll_wait() lots of times per
> second, that might be a *big* win.
>
> I'll see what can be done to add that feature.
>

Thanks a lot.  I'll be happy to test patches.