[ltt-dev] Force buffer sizes to be at least page size

Mathieu Desnoyers compudj at krystal.dyndns.org
Wed Jul 15 13:31:44 EDT 2009

* Chase Douglas (cndougla at linux.vnet.ibm.com) wrote:
> During some testing across various architectures we found that our ppc64 
> environment with 64K page sizes was causing lttctl to hang when  
> destroying a trace if the buffer size was less than 64K  
> (channel.all.bufsize). We had been testing with 16K buffer sizes, and  
> every other architecture ran fine. This led us to believe that ltt is  
> not handling buffer sizes less than a page size correctly.
> We did not determine the root cause of the failure, instead opting for a 
> quick patch to force the buffer sizes to be at least page size. I have 
> attached the patch. Please take this under advisement either to  
> determine the root cause or to force proper buffer sizes as necessary.

Actually, the subbuffer size (not only the buffer size) should be at
least a page. I'll do a patch for LTTng shortly.

Thanks for the report !


> Thank you


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Mathieu Desnoyers
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