Re: [Qemu-devel] Tracing: outstanding tasks

[Ananth N Mavinakayanahalli]

On Wed, Jun 30, 2010 at 12:51:59PM +0100, Stefan Hajnoczi wrote:
> On Wed, Jun 30, 2010 at 11:20 AM, Prerna Saxena
> <address@hidden> wrote:
> > On 06/26/2010 01:36 PM, Stefan Hajnoczi wrote:
> >>
> >> Here are the outstanding tasks for QEMU tracing, which Prerna and I have
> >> been working on.  Tracing aids debugging, profiling, and observing
> >> execution via lightweight logging at key points in the code path.

...

> >> 5. Out-of-line trace file write-out
> >>
> >> Owner: Stefan
> >>
> >> Trace buffers are written out to file synchronously.  The vcpu thread
> >> should
> >> not be blocked so an async write-out mechanism is needed.
> >>
> >> 6. Trace file command
> >>
> >> Owner: ?
> >>
> >> Traces are written out to hardcoded /tmp/trace.log.  This must be
> >> configurable.
> >> Tracing at startup time should still be possible so configuration needs to
> >> happen early.

Another feature needed would be a facility to trigger a sync of trace buffer to
file even if the buffer isn't full.

Ananth