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DTrace probes, so that ordinary reads can be distinguished from relation extension operations. Move buffer_read_start probe to before the smgrnblocks() call that's needed in the isExtend case, since really that step should be charged as part of the time needed for the extension operation. (This makes it slightly harder to match the read_start with the associated read_done, since now you can't match them on blockNumber, but it should still be possible since isExtend operations on the same relation can never be interleaved.) Per recent discussion. In passing, add the page identity (forkNum/blockNum) to the parameters of the buffer_flush_start/buffer_flush_done probes, which were unaccountably lacking the info.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.