Qemu tracing

[Frank Ch. Eigler]

prerna wrote:

> Here's an update on a self contained userspace tracer mechanism I've
> been working on, for QEMU ; alongwith Stefan Hajnoczi.

Thank you!

> [...]
> To make guest tracing with QEMU truly independent of the host on which
> it runs, QEMU must be instrumented by self-contained tracer.

OK.
How did you choose the events (probe points) for tracing?

> When running QEMU on a linux host, one has the choice of using LTTnG
> as the supported backend for tracing.  [...]

Using <sys/sdt.h> would be a natural second alternative for linux (and
dtrace platforms, if someone cares).

Even without that, have you tried applying normal systemtap user-space
probing to qemu to get some usability / performance impressions?

- FChE