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Date: Fri, 2 Jul 2010 09:53:14 +0530
From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Subject: Re: [Qemu-devel] Tracing: outstanding tasks
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To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: qemu-devel@nongnu.org, Maneesh Soni <maneesh@linux.vnet.ibm.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, Prerna Saxena <prerna@linux.vnet.ibm.com>

On Wed, Jun 30, 2010 at 12:51:59PM +0100, Stefan Hajnoczi wrote:
> On Wed, Jun 30, 2010 at 11:20 AM, Prerna Saxena
> <prerna@linux.vnet.ibm.com> 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. =A0Tracing 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. =A0The vcpu thr=
ead
> >> 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. =A0This must be
> >> configurable.
> >> Tracing at startup time should still be possible so configuration ne=
eds to
> >> happen early.

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

Ananth