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Re: [Qemu-devel] [PATCH for-2.10 v2 2/2] simpletrace: fix flight recorde
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [PATCH for-2.10 v2 2/2] simpletrace: fix flight recorder --no-header option |
Date: |
Tue, 15 Aug 2017 09:47:31 +0100 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Tue, Aug 15, 2017 at 09:44:30AM +0100, Stefan Hajnoczi wrote:
> The simpletrace.py script can pretty-print flight recorder ring buffers.
> These are not full simpletrace binary trace files but just the end of a
> trace file. There is no header and the event ID mapping information is
> often unavailable since the ring buffer may have filled up and discarded
> event ID mapping records.
>
> The simpletrace.stp script that generates ring buffer traces uses the
> same trace-events-all input file as simpletrace.py. Therefore both
> scripts have the same global ordering of trace events. A dynamic event
> ID mapping isn't necessary: just use the trace-events-all file as the
> reference for how event IDs are numbered.
>
> It is now possible to analyze simpletrace.stp ring buffers again using:
>
> $ ./simpletrace.py trace-events-all path/to/ring-buffer
>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
> scripts/simpletrace.py | 24 ++++++++++++++++++------
> 1 file changed, 18 insertions(+), 6 deletions(-)
Reviewed-by: Daniel P. Berrange <address@hidden>
Regards,
Daniel
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