[ltt-dev] Crash recovery of traces and final TSC

[Mathieu Desnoyers]

* Pierre-Marc Fournier (pierre-marc.fournier at polymtl.ca) wrote:
> Mathieu,
> 
> When the system crashes, the end timestamp is not written in the
> subbuffer header. Instead, the value 0 is written. This tends to make
> LTTV crash.
> 
> What do you think should be done to fix this?
> 
> - write the timestamp in the header after writing each event?

Too costly.

> - "repair" the trace a posteriori, writing in the header the timestamp
> of the last event found in the subbuffer?

Yep, seems like an appropriate solution.

> - change lttv not to not need the "end timestamp" header field?

Hrm, it needs it for quickly seeking to specific sub-buffers. I think
it's better to leave it and fix the last subbuffer's end timestamp with
its last event, as you propose.

Mathieu

> 
> Thanks.
> 
> pmf
> 
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-- 
Mathieu Desnoyers
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