Make the 'wal_debug' GUC variable a boolean (rather than an integer), and
hide it behind #ifdef WAL_DEBUG blocks.
This commit is contained in:
Neil Conway
parent
b0c4a50bbb
commit
bc028beb16
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@ -1,5 +1,5 @@
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/show.sgml,v 1.34 2003/11/29 19:51:39 pgsql Exp $
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$PostgreSQL: pgsql/doc/src/sgml/ref/show.sgml,v 1.35 2004/01/06 17:26:23 neilc Exp $
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PostgreSQL documentation
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-->
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@ -172,7 +172,7 @@ SHOW ALL;
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.
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.
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.
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wal_debug | 0
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wal_debug | off
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wal_sync_method | fdatasync
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(94 rows)
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</programlisting>
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@ -1,5 +1,5 @@
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.228 2004/01/05 20:37:51 neilc Exp $
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.229 2004/01/06 17:26:22 neilc Exp $
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-->
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<Chapter Id="runtime">
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@ -2667,10 +2667,13 @@ dynamic_library_path = '/usr/local/lib/postgresql:/home/my_project/lib:$libdir'
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</varlistentry>
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<varlistentry>
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<term><varname>wal_debug</varname> (<type>integer</type>)</term>
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<term><varname>wal_debug</varname> (<type>boolean</type>)</term>
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<listitem>
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<para>
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If nonzero, turn on WAL-related debugging output.
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If true, emit WAL-related debugging output. This option is
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only available if the <symbol>WAL_DEBUG</symbol> macro was
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defined when <productname>PostgreSQL</productname> was
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compiled.
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</para>
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</listitem>
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</varlistentry>
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@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.26 2003/11/29 19:51:38 pgsql Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.27 2004/01/06 17:26:23 neilc Exp $ -->
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<chapter id="wal">
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<title>Write-Ahead Logging (<acronym>WAL</acronym>)</title>
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@ -19,10 +19,10 @@
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transaction processing. Briefly, <acronym>WAL</acronym>'s central
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concept is that changes to data files (where tables and indexes
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reside) must be written only after those changes have been logged,
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that is, when log records have been flushed to permanent
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storage. If we follow this procedure, we do not need to flush
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data pages to disk on every transaction commit, because we know
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that in the event of a crash we will be able to recover the
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that is, when log records describing the changes have been flushed
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to permanent storage. If we follow this procedure, we do not need
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to flush data pages to disk on every transaction commit, because we
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know that in the event of a crash we will be able to recover the
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database using the log: any changes that have not been applied to
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the data pages will first be redone from the log records (this is
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roll-forward recovery, also known as REDO) and then changes made by
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@ -187,7 +187,7 @@
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<para>
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There will be at least one 16 MB segment file, and will normally
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not be more than 2 * <varname>checkpoint_segments</varname> + 1
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files. You can use this to estimate space requirements for WAL.
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files. You can use this to estimate space requirements for <acronym>WAL</acronym>.
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Ordinarily, when old log segment files are no longer needed, they
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are recycled (renamed to become the next segments in the numbered
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sequence). If, due to a short-term peak of log output rate, there
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@ -254,7 +254,7 @@
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<para>
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The <varname>wal_sync_method</varname> parameter determines how
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<productname>PostgreSQL</productname> will ask the kernel to force
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WAL updates out to disk.
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<acronym>WAL</acronym> updates out to disk.
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All the options should be the same as far as reliability goes,
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but it's quite platform-specific which one will be the fastest.
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Note that this parameter is irrelevant if <varname>fsync</varname>
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@ -262,11 +262,10 @@
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</para>
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<para>
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Setting the <varname>wal_debug</varname> parameter to any nonzero
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value will result in each <function>LogInsert</function> and
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Enabling the <varname>wal_debug</varname> configuration parameter
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will result in each <function>LogInsert</function> and
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<function>LogFlush</function> <acronym>WAL</acronym> call being
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logged to the server log. At present, it makes no difference what
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the nonzero value is. This option may be replaced by a more
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logged to the server log. This option may be replaced by a more
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general mechanism in the future.
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</para>
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</sect1>
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.129 2003/12/20 17:31:20 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.130 2004/01/06 17:26:23 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -86,12 +86,15 @@
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/* User-settable parameters */
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int CheckPointSegments = 3;
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int XLOGbuffers = 8;
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int XLOG_DEBUG = 0;
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char *XLOG_sync_method = NULL;
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const char XLOG_sync_method_default[] = DEFAULT_SYNC_METHOD_STR;
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char XLOG_archive_dir[MAXPGPATH]; /* null string means
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* delete 'em */
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#ifdef WAL_DEBUG
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bool XLOG_DEBUG = false;
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#endif
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/*
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* XLOGfileslop is used in the code as the allowed "fuzz" in the number of
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* preallocated XLOG segments --- we try to have at least XLOGfiles advance
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@ -766,6 +769,7 @@ begin:;
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MyProc->logRec = RecPtr;
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}
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#ifdef WAL_DEBUG
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if (XLOG_DEBUG)
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{
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char buf[8192];
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@ -779,6 +783,7 @@ begin:;
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}
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elog(LOG, "%s", buf);
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}
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#endif
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/* Record begin of record in appropriate places */
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if (!no_tran)
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@ -1074,8 +1079,10 @@ XLogWrite(XLogwrtRqst WriteRqst)
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openLogSeg >= (RedoRecPtr.xrecoff / XLogSegSize) +
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(uint32) CheckPointSegments))
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{
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#ifdef WAL_DEBUG
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if (XLOG_DEBUG)
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elog(LOG, "time for a checkpoint, signaling postmaster");
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#endif
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SendPostmasterSignal(PMSIGNAL_DO_CHECKPOINT);
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}
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}
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@ -1214,11 +1221,13 @@ XLogFlush(XLogRecPtr record)
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if (XLByteLE(record, LogwrtResult.Flush))
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return;
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#ifdef WAL_DEBUG
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if (XLOG_DEBUG)
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elog(LOG, "xlog flush request %X/%X; write %X/%X; flush %X/%X",
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record.xlogid, record.xrecoff,
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LogwrtResult.Write.xlogid, LogwrtResult.Write.xrecoff,
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LogwrtResult.Flush.xlogid, LogwrtResult.Flush.xrecoff);
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#endif
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START_CRIT_SECTION();
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@ -2613,8 +2622,10 @@ StartupXLOG(void)
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/* This is just to allow attaching to startup process with a debugger */
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#ifdef XLOG_REPLAY_DELAY
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#ifdef WAL_DEBUG
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if (XLOG_DEBUG && ControlFile->state != DB_SHUTDOWNED)
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sleep(60);
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#endif
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#endif
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/*
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@ -2742,6 +2753,8 @@ StartupXLOG(void)
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ShmemVariableCache->nextXid = record->xl_xid;
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TransactionIdAdvance(ShmemVariableCache->nextXid);
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}
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#ifdef WAL_DEBUG
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if (XLOG_DEBUG)
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{
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char buf[8192];
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@ -2755,6 +2768,7 @@ StartupXLOG(void)
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record->xl_info, XLogRecGetData(record));
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elog(LOG, "%s", buf);
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}
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#endif
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if (record->xl_info & XLR_BKP_BLOCK_MASK)
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RestoreBkpBlocks(record, EndRecPtr);
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@ -10,7 +10,7 @@
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.175 2003/12/03 18:52:00 joe Exp $
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.176 2004/01/06 17:26:23 neilc Exp $
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*
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*--------------------------------------------------------------------
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*/
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@ -336,17 +336,18 @@ const char *const config_type_names[] =
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* TO ADD AN OPTION:
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*
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* 1. Declare a global variable of type bool, int, double, or char*
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* and make use of it.
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* and make use of it.
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*
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* 2. Decide at what times it's safe to set the option. See guc.h for
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* details.
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* details.
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*
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* 3. Decide on a name, a default value, upper and lower bounds (if
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* applicable), etc.
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* applicable), etc.
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*
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* 4. Add a record below.
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*
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* 5. Add it to src/backend/utils/misc/postgresql.conf.sample.
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* 5. Add it to src/backend/utils/misc/postgresql.conf.sample, if
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* appropriate
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*
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* 6. Add it to src/bin/psql/tab-complete.c, if it's a USERSET option.
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*
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@ -862,6 +863,18 @@ static struct config_bool ConfigureNamesBool[] =
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#endif
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},
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#ifdef WAL_DEBUG
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{
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{"wal_debug", PGC_SUSET, DEVELOPER_OPTIONS,
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gettext_noop("Emit WAL-related debugging output."),
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NULL,
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GUC_NOT_IN_SAMPLE
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},
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&XLOG_DEBUG,
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false, NULL, NULL
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},
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#endif
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/* End-of-list marker */
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{
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{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL
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@ -1171,16 +1184,6 @@ static struct config_int ConfigureNamesInt[] =
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8, 4, INT_MAX, NULL, NULL
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},
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{
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{"wal_debug", PGC_SUSET, DEVELOPER_OPTIONS,
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gettext_noop("If nonzero, WAL-related debugging output is logged."),
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NULL,
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GUC_NOT_IN_SAMPLE
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},
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&XLOG_DEBUG,
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0, 0, 16, NULL, NULL
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},
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{
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{"commit_delay", PGC_USERSET, WAL_CHECKPOINTS,
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gettext_noop("Sets the delay in microseconds between transaction commit and "
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@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.46 2003/12/12 18:45:10 petere Exp $
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* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.47 2004/01/06 17:26:23 neilc Exp $
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*/
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#ifndef XLOG_H
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#define XLOG_H
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@ -189,10 +189,12 @@ extern XLogRecPtr ProcLastRecEnd;
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extern int CheckPointSegments;
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extern int CheckPointWarning;
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extern int XLOGbuffers;
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extern int XLOG_DEBUG;
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extern char *XLOG_sync_method;
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extern const char XLOG_sync_method_default[];
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#ifdef WAL_DEBUG
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extern bool XLOG_DEBUG;
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#endif
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extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
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extern void XLogFlush(XLogRecPtr RecPtr);
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@ -6,7 +6,7 @@
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* for developers. If you edit any of these, be sure to do a *full*
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* rebuild (and an initdb if noted).
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*
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* $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.8 2003/11/29 22:40:53 pgsql Exp $
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* $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.9 2004/01/06 17:26:23 neilc Exp $
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*------------------------------------------------------------------------
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*/
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@ -224,6 +224,12 @@
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*/
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/* #define LOCK_DEBUG */
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/*
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* Enable debugging print statements for WAL-related operations; see
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* also the wal_debug GUC var.
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*/
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/* #define WAL_DEBUG */
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/*
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* Other debug #defines (documentation, anyone?)
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*/
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