pgsql: DTrace support, with a small initial set of probes by Robert Lor

Log Message:
-----------
DTrace support, with a small initial set of probes

by Robert Lor

Modified Files:
--------------
pgsql:
configure (r1.497 -> r1.498)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.diff?r1=1.497&r2=1.498)
configure.in (r1.468 -> r1.469)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in.diff?r1=1.468&r2=1.469)
pgsql/doc/src/sgml:
installation.sgml (r1.258 -> r1.259)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml.diff?r1=1.258&r2=1.259)
pgsql/src:
Makefile.global.in (r1.224 -> r1.225)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.global.in.diff?r1=1.224&r2=1.225)
pgsql/src/backend:
Makefile (r1.116 -> r1.117)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/Makefile.diff?r1=1.116&r2=1.117)
pgsql/src/backend/access/transam:
xact.c (r1.223 -> r1.224)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xact.c.diff?r1=1.223&r2=1.224)
pgsql/src/backend/storage/lmgr:
lock.c (r1.168 -> r1.169)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/lock.c.diff?r1=1.168&r2=1.169)
lwlock.c (r1.41 -> r1.42)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/lmgr/lwlock.c.diff?r1=1.41&r2=1.42)
pgsql/src/include:
c.h (r1.206 -> r1.207)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/c.h.diff?r1=1.206&r2=1.207)
pg_config.h.in (r1.98 -> r1.99)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.in.diff?r1=1.98&r2=1.99)

Added Files:
-----------
pgsql/src/backend/utils:
probes.d (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/probes.d?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/include:
pg_trace.h (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_trace.h?rev=1.1&content-type=text/x-cvsweb-markup)