Hash twice

Simon Riggs <simon@2ndquadrant.com>

From: Simon Riggs <simon@2ndQuadrant.com>

To: PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2013-01-12T16:39:15Z

Lists: pgsql-hackers

Attachments

hash_once.v1.patch (application/octet-stream) patch v1

Lock code says it calculates "hash value once and then pass around as needed".

But it actually calculates it twice for new locks.

Trivial patch attached to make it follow the comments in
LockTagHashCode and save a few cycles.

-- 
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services