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Date: Thu, 26 Jul 2007 14:56:08 -0500
From: Robert Lor <Robert.Lor@Sun.COM>
Subject: Re: User concurrency thresholding: where do I look?
In-reply-to: <27577.1185464568@sss.pgh.pa.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: "Jignesh K. Shah" <J.K.Shah@Sun.COM>, Simon Riggs <simon@2ndquadrant.com>,
	Josh Berkus <josh@agliodbs.com>, pgsql-performance@postgresql.org,
	Alvaro Herrera <alvherre@commandprompt.com>
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Tom Lane wrote:
> 
> That path would be taking CLogControlLock ... so you're off by at least
> one.  Compare the script to src/include/storage/lwlock.h.
> 

Indeed, the indexing was off by one due to the removal of 
BuffMappingLock in src/include/storage/lwlock.h between 8.1 and 8.2 
which was not updated in the DTrace script.

Thanks,
Robert