Re: [Qemu-devel] [PATCH] simpletrace: Thread-safe tracing

[Avi Kivity <avi@redhat.com>]

On 02/27/2011 04:58 PM, Stefan Hajnoczi wrote:
> Trace events outside the global mutex cannot be used with the simple
> trace backend since it is not thread-safe.  There is no check to prevent
> them being enabled so people sometimes learn this the hard way.
>
> This patch restructures the simple trace backend with a ring buffer
> suitable for multiple concurrent writers.  A writeout thread empties the
> trace buffer when threshold fill levels are reached.  Should the
> writeout thread be unable to keep up with trace generation, records will
> simply be dropped.

It would be good to have an indication of the fact that records were 
dropped in the file.

-- 
error compiling committee.c: too many arguments to function