Don't bother to lock bufmgr partitions in pg_buffercache.

That makes the view a lot less disruptive to use on a production system.
Without the locks, you don't get a consistent snapshot across all buffers,
but that's OK. It wasn't a very useful guarantee in practice.

Ivan Kartyshov, reviewed by Tomas Vondra and Robert Haas.

Discusssion: <[email protected]>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/6e654546fb61f62cc982d0c8f62241b3b30e7ef8

Modified Files
--------------
contrib/pg_buffercache/pg_buffercache_pages.c | 23 ++++-------------------
1 file changed, 4 insertions(+), 19 deletions(-)


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