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Re: Some newbie questions


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.

-- 
David Smith
dsmith@redhat.com
Red Hat
http://www.redhat.com
256.217.0141 (direct)
256.837.0057 (fax)


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