On Fri, Jul 2, 2010 at 5:23 AM, Ananth N Mavinakayanahalli <ana...@in.ibm.com> wrote: > On Wed, Jun 30, 2010 at 12:51:59PM +0100, Stefan Hajnoczi wrote: >> On Wed, Jun 30, 2010 at 11:20 AM, Prerna Saxena >> <pre...@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. 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.
Good idea. A related piece that is not in the current tracing branch is syncing to trace buffer to file on exit. Right now a partially filled trace buffer is not written when QEMU exits. Stefan
