Skip searching for subxact locks at commit.
At commit all standby locks are released
for the top-level transaction, so searching
for locks for each subtransaction is both
pointless and costly (N^2) in the presence
of many AccessExclusiveLocks.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/d9fad1076da4f3686b16e7c9f137118a3156a43a

Modified Files
--------------
src/backend/access/transam/xact.c |    6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)

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Next:	From: Simon Riggs	Date: 2012-11-13 19:14:45
	Subject: pgsql: Skip searching for subxact locks at commit.
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	Subject: pgsql: Clarify docs on hot standby lock release