by Heikki and a little bit by me.
-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.129 2007/06/28 00:02:37 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.130 2007/06/30 19:12:01 tgl Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
</listitem>
</varlistentry>
+ <varlistentry id="guc-log-checkpoints" xreflabel="log_checkpoints">
+ <term><varname>log_checkpoints</varname> (<type>boolean</type>)</term>
+ <indexterm>
+ <primary><varname>log_checkpoints</> configuration parameter</primary>
+ </indexterm>
+ <listitem>
+ <para>
+ Causes checkpoints to be logged in the server log. Some
+ statistics about each checkpoint are included in the log messages,
+ including the number of buffers written and the time spent writing
+ them.
+ This parameter can only be set in the <filename>postgresql.conf</>
+ file or on the server command line. The default is off.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="guc-log-connections" xreflabel="log_connections">
<term><varname>log_connections</varname> (<type>boolean</type>)</term>
<indexterm>
</indexterm>
<listitem>
<para>
- This outputs a line to the server log detailing each successful
- connection. This is off by default, although it is probably very
- useful. Some client programs, like <application>psql</>, attempt
- to connect twice while determining if a password is required, so
- duplicate <quote>connection received</> messages do not
- necessarily indicate a problem.
+ Causes each attempted connection to the server to be logged,
+ as well as successful completion of client authentication.
This parameter can only be set in the <filename>postgresql.conf</>
- file or on the server command line.
+ file or on the server command line. The default is off.
</para>
+
+ <note>
+ <para>
+ Some client programs, like <application>psql</>, attempt
+ to connect twice while determining if a password is required, so
+ duplicate <quote>connection received</> messages do not
+ necessarily indicate a problem.
+ </para>
+ </note>
</listitem>
</varlistentry>
</note>
</listitem>
</varlistentry>
+
+ <varlistentry id="guc-log-hostname" xreflabel="log_hostname">
+ <term><varname>log_hostname</varname> (<type>boolean</type>)</term>
+ <indexterm>
+ <primary><varname>log_hostname</> configuration parameter</primary>
+ </indexterm>
+ <listitem>
+ <para>
+ By default, connection log messages only show the IP address of the
+ connecting host. Turning on this parameter causes logging of the
+ host name as well. Note that depending on your host name resolution
+ setup this might impose a non-negligible performance penalty.
+ This parameter can only be set in the <filename>postgresql.conf</>
+ file or on the server command line.
+ </para>
+ </listitem>
+ </varlistentry>
<varlistentry id="guc-log-line-prefix" xreflabel="log_line_prefix">
<term><varname>log_line_prefix</varname> (<type>string</type>)</term>
</listitem>
</varlistentry>
+ <varlistentry id="guc-log-lock-waits" xreflabel="log_lock_waits">
+ <term><varname>log_lock_waits</varname> (<type>boolean</type>)</term>
+ <indexterm>
+ <primary><varname>log_lock_waits</> configuration parameter</primary>
+ </indexterm>
+ <listitem>
+ <para>
+ Controls whether a log message is produced when a session waits
+ longer than <xref linkend="guc-deadlock-timeout"> to acquire a
+ lock. This is useful in determining if lock waits are causing
+ poor performance. The default is <literal>off</>.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="guc-log-statement" xreflabel="log_statement">
<term><varname>log_statement</varname> (<type>string</type>)</term>
<indexterm>
</listitem>
</varlistentry>
- <varlistentry id="guc-log-hostname" xreflabel="log_hostname">
- <term><varname>log_hostname</varname> (<type>boolean</type>)</term>
- <indexterm>
- <primary><varname>log_hostname</> configuration parameter</primary>
- </indexterm>
- <listitem>
- <para>
- By default, connection log messages only show the IP address of the
- connecting host. Turning on this parameter causes logging of the
- host name as well. Note that depending on your host name resolution
- setup this might impose a non-negligible performance penalty.
- This parameter can only be set in the <filename>postgresql.conf</>
- file or on the server command line.
- </para>
- </listitem>
- </varlistentry>
-
- <varlistentry id="guc-log-lock-waits" xreflabel="log_lock_waits">
- <term><varname>log_lock_waits</varname> (<type>boolean</type>)</term>
- <indexterm>
- <primary><varname>log_lock_waits</> configuration parameter</primary>
- </indexterm>
- <listitem>
- <para>
- Controls whether a log message is produced when a session waits
- longer than <xref linkend="guc-deadlock-timeout"> to acquire a
- lock. This is useful in determining if lock waits are causing
- poor performance. The default is <literal>off</>.
- </para>
- </listitem>
- </varlistentry>
-
<varlistentry id="guc-log-temp-files" xreflabel="log_temp_files">
<term><varname>log_temp_files</varname> (<type>integer</type>)</term>
<indexterm>
<listitem>
<para>
Controls whether temporary files are logged when deleted.
+ Temporary files can be
+ created for sorts, hashes, and temporary query results.
A value of zero logs all temporary files, and positive
values log only files whose size is equal or greater than
- the specified number of kilobytes. Temporary files can be
- created for sorts, hashes, and temporary results. The
- default is <literal>-1</> (off).
+ the specified number of kilobytes. The
+ default is <literal>-1</>, which disables this logging.
</para>
</listitem>
</varlistentry>
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.273 2007/06/28 00:02:37 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.274 2007/06/30 19:12:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
char *XLOG_sync_method = NULL;
const char XLOG_sync_method_default[] = DEFAULT_SYNC_METHOD_STR;
bool fullPageWrites = true;
+bool log_checkpoints = false;
#ifdef WAL_DEBUG
bool XLOG_DEBUG = false;
#define XLOG_SYNC_BIT (enableFsync ? open_sync_bit : 0)
+/*
+ * Statistics for current checkpoint are collected in this global struct.
+ * Because only the background writer or a stand-alone backend can perform
+ * checkpoints, this will be unused in normal backends.
+ */
+CheckpointStatsData CheckpointStats;
+
/*
* ThisTimeLineID will be same in all backends --- it identifies current
* WAL timeline for the database system.
static void XLogFileClose(void);
static bool RestoreArchivedFile(char *path, const char *xlogfname,
const char *recovername, off_t expectedSize);
-static int PreallocXlogFiles(XLogRecPtr endptr);
-static void RemoveOldXlogFiles(uint32 log, uint32 seg, XLogRecPtr endptr,
- int *nsegsremoved, int *nsegsrecycled);
+static void PreallocXlogFiles(XLogRecPtr endptr);
+static void RemoveOldXlogFiles(uint32 log, uint32 seg, XLogRecPtr endptr);
static void CleanupBackupHistory(void);
static XLogRecord *ReadRecord(XLogRecPtr *RecPtr, int emode);
static bool ValidXLOGHeader(XLogPageHeader hdr, int emode);
Write->lastSegSwitchTime = time(NULL);
/*
- * Signal bgwriter to start a checkpoint if it's been too long
- * since the last one. (We look at local copy of RedoRecPtr
- * which might be a little out of date, but should be close
- * enough for this purpose.)
+ * Signal bgwriter to start a checkpoint if we've consumed too
+ * much xlog since the last one. (We look at local copy of
+ * RedoRecPtr which might be a little out of date, but should
+ * be close enough for this purpose.)
*
* A straight computation of segment number could overflow 32
* bits. Rather than assuming we have working 64-bit
new_highbits = openLogId / XLogSegSize;
if (new_highbits != old_highbits ||
new_segno >= old_segno + (uint32) (CheckPointSegments-1))
- {
-#ifdef WAL_DEBUG
- if (XLOG_DEBUG)
- elog(LOG, "time for a checkpoint, signaling bgwriter");
-#endif
- RequestCheckpoint(CHECKPOINT_WARNONTIME);
- }
+ RequestCheckpoint(CHECKPOINT_CAUSE_XLOG);
}
}
}
{
char path[MAXPGPATH];
char tmppath[MAXPGPATH];
- char zbuffer[XLOG_BLCKSZ];
+ char *zbuffer;
uint32 installed_log;
uint32 installed_seg;
int max_advance;
* pre-creating an extra log segment. That seems OK, and better than
* holding the lock throughout this lengthy process.
*/
+ elog(DEBUG2, "creating and filling new WAL file");
+
snprintf(tmppath, MAXPGPATH, XLOGDIR "/xlogtemp.%d", (int) getpid());
unlink(tmppath);
* fsync below) that all the indirect blocks are down on disk. Therefore,
* fdatasync(2) or O_DSYNC will be sufficient to sync future writes to the
* log file.
+ *
+ * Note: palloc zbuffer, instead of just using a local char array, to
+ * ensure it is reasonably well-aligned; this may save a few cycles
+ * transferring data to the kernel.
*/
- MemSet(zbuffer, 0, sizeof(zbuffer));
- for (nbytes = 0; nbytes < XLogSegSize; nbytes += sizeof(zbuffer))
+ zbuffer = (char *) palloc0(XLOG_BLCKSZ);
+ for (nbytes = 0; nbytes < XLogSegSize; nbytes += XLOG_BLCKSZ)
{
errno = 0;
- if ((int) write(fd, zbuffer, sizeof(zbuffer)) != (int) sizeof(zbuffer))
+ if ((int) write(fd, zbuffer, XLOG_BLCKSZ) != (int) XLOG_BLCKSZ)
{
int save_errno = errno;
errmsg("could not write to file \"%s\": %m", tmppath)));
}
}
+ pfree(zbuffer);
if (pg_fsync(fd) != 0)
ereport(ERROR,
unlink(tmppath);
}
+ elog(DEBUG2, "done creating and filling new WAL file");
+
/* Set flag to tell caller there was no existent file */
*use_existent = false;
* recycled log segments, but the startup transient is likely to include
* a lot of segment creations by foreground processes, which is not so good.
*/
-static int
+static void
PreallocXlogFiles(XLogRecPtr endptr)
{
- int nsegsadded = 0;
uint32 _logId;
uint32 _logSeg;
int lf;
lf = XLogFileInit(_logId, _logSeg, &use_existent, true);
close(lf);
if (!use_existent)
- nsegsadded++;
+ CheckpointStats.ckpt_segs_added++;
}
- return nsegsadded;
}
/*
* whether we want to recycle rather than delete no-longer-wanted log files.
*/
static void
-RemoveOldXlogFiles(uint32 log, uint32 seg, XLogRecPtr endptr,
- int *nsegsremoved, int *nsegsrecycled)
+RemoveOldXlogFiles(uint32 log, uint32 seg, XLogRecPtr endptr)
{
uint32 endlogId;
uint32 endlogSeg;
char lastoff[MAXFNAMELEN];
char path[MAXPGPATH];
- *nsegsremoved = 0;
- *nsegsrecycled = 0;
-
/*
* Initialize info about where to try to recycle to. We allow recycling
* segments up to XLOGfileslop segments beyond the current XLOG location.
ereport(DEBUG2,
(errmsg("recycled transaction log file \"%s\"",
xlde->d_name)));
- (*nsegsrecycled)++;
+ CheckpointStats.ckpt_segs_recycled++;
/* Needn't recheck that slot on future iterations */
if (max_advance > 0)
{
(errmsg("removing transaction log file \"%s\"",
xlde->d_name)));
unlink(path);
- (*nsegsremoved)++;
+ CheckpointStats.ckpt_segs_removed++;
}
XLogArchiveCleanup(xlde->d_name);
/*
* Preallocate additional log files, if wanted.
*/
- (void) PreallocXlogFiles(EndOfLog);
+ PreallocXlogFiles(EndOfLog);
/*
* Okay, we're officially UP.
(errmsg("database system is shut down")));
}
+/*
+ * Log start of a checkpoint.
+ */
+static void
+LogCheckpointStart(int flags)
+{
+ elog(LOG, "checkpoint starting:%s%s%s%s%s%s",
+ (flags & CHECKPOINT_IS_SHUTDOWN) ? " shutdown" : "",
+ (flags & CHECKPOINT_IMMEDIATE) ? " immediate" : "",
+ (flags & CHECKPOINT_FORCE) ? " force" : "",
+ (flags & CHECKPOINT_WAIT) ? " wait" : "",
+ (flags & CHECKPOINT_CAUSE_XLOG) ? " xlog" : "",
+ (flags & CHECKPOINT_CAUSE_TIME) ? " time" : "");
+}
+
+/*
+ * Log end of a checkpoint.
+ */
+static void
+LogCheckpointEnd(void)
+{
+ long write_secs, sync_secs, total_secs;
+ int write_usecs, sync_usecs, total_usecs;
+
+ CheckpointStats.ckpt_end_t = GetCurrentTimestamp();
+
+ TimestampDifference(CheckpointStats.ckpt_start_t,
+ CheckpointStats.ckpt_end_t,
+ &total_secs, &total_usecs);
+
+ TimestampDifference(CheckpointStats.ckpt_write_t,
+ CheckpointStats.ckpt_sync_t,
+ &write_secs, &write_usecs);
+
+ TimestampDifference(CheckpointStats.ckpt_sync_t,
+ CheckpointStats.ckpt_sync_end_t,
+ &sync_secs, &sync_usecs);
+
+ elog(LOG, "checkpoint complete: wrote %d buffers (%.1f%%); "
+ "%d transaction log file(s) added, %d removed, %d recycled; "
+ "write=%ld.%03d s, sync=%ld.%03d s, total=%ld.%03d s",
+ CheckpointStats.ckpt_bufs_written,
+ (double) CheckpointStats.ckpt_bufs_written * 100 / NBuffers,
+ CheckpointStats.ckpt_segs_added,
+ CheckpointStats.ckpt_segs_removed,
+ CheckpointStats.ckpt_segs_recycled,
+ write_secs, write_usecs/1000,
+ sync_secs, sync_usecs/1000,
+ total_secs, total_usecs/1000);
+}
+
/*
* Perform a checkpoint --- either during shutdown, or on-the-fly
*
* CHECKPOINT_FORCE: force a checkpoint even if no XLOG activity has occured
* since the last one (implied by CHECKPOINT_IS_SHUTDOWN).
*
- * Note: flags might contain other bits of interest to RequestCheckpoint.
+ * Note: flags contains other bits, of interest here only for logging purposes.
* In particular note that this routine is synchronous and does not pay
* attention to CHECKPOINT_WAIT.
*/
uint32 freespace;
uint32 _logId;
uint32 _logSeg;
- int nsegsadded = 0;
- int nsegsremoved = 0;
- int nsegsrecycled = 0;
TransactionId *inCommitXids;
int nInCommit;
*/
LWLockAcquire(CheckpointLock, LW_EXCLUSIVE);
+ /*
+ * Prepare to accumulate statistics.
+ *
+ * Note: because it is possible for log_checkpoints to change while a
+ * checkpoint proceeds, we always accumulate stats, even if
+ * log_checkpoints is currently off.
+ */
+ MemSet(&CheckpointStats, 0, sizeof(CheckpointStats));
+ CheckpointStats.ckpt_start_t = GetCurrentTimestamp();
+
/*
* Use a critical section to force system panic if we have trouble.
*/
*/
LWLockRelease(WALInsertLock);
- if (!shutdown)
- ereport(DEBUG2,
- (errmsg("checkpoint starting")));
+ /*
+ * If enabled, log checkpoint start. We postpone this until now
+ * so as not to log anything if we decided to skip the checkpoint.
+ */
+ if (log_checkpoints)
+ LogCheckpointStart(flags);
/*
* Before flushing data, we must wait for any transactions that are
if (_logId || _logSeg)
{
PrevLogSeg(_logId, _logSeg);
- RemoveOldXlogFiles(_logId, _logSeg, recptr,
- &nsegsremoved, &nsegsrecycled);
+ RemoveOldXlogFiles(_logId, _logSeg, recptr);
}
/*
* segments, since that may supply some of the needed files.)
*/
if (!shutdown)
- nsegsadded = PreallocXlogFiles(recptr);
+ PreallocXlogFiles(recptr);
/*
* Truncate pg_subtrans if possible. We can throw away all data before
if (!InRecovery)
TruncateSUBTRANS(GetOldestXmin(true, false));
- if (!shutdown)
- ereport(DEBUG2,
- (errmsg("checkpoint complete; %d transaction log file(s) added, %d removed, %d recycled",
- nsegsadded, nsegsremoved, nsegsrecycled)));
+ /* All real work is done, but log before releasing lock. */
+ if (log_checkpoints)
+ LogCheckpointEnd();
LWLockRelease(CheckpointLock);
}
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.39 2007/06/28 00:02:38 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.40 2007/06/30 19:12:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
for (;;)
{
bool do_checkpoint = false;
+ int flags = 0;
time_t now;
int elapsed_secs;
}
/*
- * Do an unforced checkpoint if too much time has elapsed since the
- * last one.
+ * Force a checkpoint if too much time has elapsed since the
+ * last one. Note that we count a timed checkpoint in stats only
+ * when this occurs without an external request, but we set the
+ * CAUSE_TIME flag bit even if there is also an external request.
*/
now = time(NULL);
elapsed_secs = now - last_checkpoint_time;
- if (!do_checkpoint && elapsed_secs >= CheckPointTimeout)
+ if (elapsed_secs >= CheckPointTimeout)
{
+ if (!do_checkpoint)
+ BgWriterStats.m_timed_checkpoints++;
do_checkpoint = true;
- BgWriterStats.m_timed_checkpoints++;
+ flags |= CHECKPOINT_CAUSE_TIME;
}
/*
{
/* use volatile pointer to prevent code rearrangement */
volatile BgWriterShmemStruct *bgs = BgWriterShmem;
- int flags;
/*
* Atomically fetch the request flags to figure out what
* a new checkpoint.
*/
SpinLockAcquire(&bgs->ckpt_lck);
- flags = bgs->ckpt_flags;
+ flags |= bgs->ckpt_flags;
bgs->ckpt_flags = 0;
bgs->ckpt_started++;
SpinLockRelease(&bgs->ckpt_lck);
/*
* We will warn if (a) too soon since last checkpoint (whatever
- * caused it) and (b) somebody set the CHECKPOINT_WARNONTIME flag
+ * caused it) and (b) somebody set the CHECKPOINT_CAUSE_XLOG flag
* since the last checkpoint start. Note in particular that this
* implementation will not generate warnings caused by
* CheckPointTimeout < CheckPointWarning.
*/
- if ((flags & CHECKPOINT_WARNONTIME) &&
+ if ((flags & CHECKPOINT_CAUSE_XLOG) &&
elapsed_secs < CheckPointWarning)
ereport(LOG,
(errmsg("checkpoints are occurring too frequently (%d seconds apart)",
* ignoring checkpoint_completion_target parameter.
* CHECKPOINT_FORCE: force a checkpoint even if no XLOG activity has occured
* since the last one (implied by CHECKPOINT_IS_SHUTDOWN).
- * CHECKPOINT_WARNONTIME: if it's "too soon" since the last checkpoint,
- * the bgwriter will log a warning. This should be true only for
- * checkpoints requested due to xlog filling, else the warning will
- * be misleading.
* CHECKPOINT_WAIT: wait for completion before returning (otherwise,
* just signal bgwriter to do it, and return).
+ * CHECKPOINT_CAUSE_XLOG: checkpoint is requested due to xlog filling.
+ * (This affects logging, and in particular enables CheckPointWarning.)
*/
void
RequestCheckpoint(int flags)
old_failed = bgs->ckpt_failed;
old_started = bgs->ckpt_started;
- bgs->ckpt_flags |= (flags & ~CHECKPOINT_WAIT);
+ bgs->ckpt_flags |= flags;
SpinLockRelease(&bgs->ckpt_lck);
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.222 2007/06/28 00:02:38 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.223 2007/06/30 19:12:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
if (++buf_id >= NBuffers)
buf_id = 0;
}
+
+ /*
+ * Update checkpoint statistics. As noted above, this doesn't
+ * include buffers written by other backends or bgwriter scan.
+ */
+ CheckpointStats.ckpt_bufs_written += num_written;
}
/*
void
CheckPointBuffers(int flags)
{
+ CheckpointStats.ckpt_write_t = GetCurrentTimestamp();
BufferSync(flags);
+ CheckpointStats.ckpt_sync_t = GetCurrentTimestamp();
smgrsync();
+ CheckpointStats.ckpt_sync_end_t = GetCurrentTimestamp();
}
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.403 2007/06/28 00:02:39 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.404 2007/06/30 19:12:02 tgl Exp $
*
*--------------------------------------------------------------------
*/
&SilentMode,
false, NULL, NULL
},
+ {
+ {"log_checkpoints", PGC_SIGHUP, LOGGING_WHAT,
+ gettext_noop("Logs each checkpoint."),
+ NULL
+ },
+ &log_checkpoints,
+ false, NULL, NULL
+ },
{
{"log_connections", PGC_BACKEND, LOGGING_WHAT,
gettext_noop("Logs each successful connection."),
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = off
+#log_checkpoints = off
#log_connections = off
#log_disconnections = off
#log_duration = off
+#log_hostname = off
#log_line_prefix = '' # Special values:
# %u = user name
# %d = database name
# processes
# %% = '%'
# e.g. '<%u%%%d> '
+#log_lock_waits = off # Log lock waits >= deadlock_timeout
#log_statement = 'none' # none, ddl, mod, all
-#log_hostname = off
-#log_lock_waits = off # Log lock waits longer than deadlock_timeout
#log_temp_files = -1 # Log temporary files equal or larger
- # than the specified number of kilobytes.
+ # than specified number of kilobytes.
# -1 disables; 0 logs all temp files
#---------------------------------------------------------------------------
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.79 2007/06/28 00:02:39 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.80 2007/06/30 19:12:02 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
#include "lib/stringinfo.h"
#include "storage/buf.h"
#include "utils/pg_crc.h"
+#include "utils/timestamp.h"
/*
extern int XLogArchiveTimeout;
extern char *XLOG_sync_method;
extern const char XLOG_sync_method_default[];
+extern bool log_checkpoints;
#define XLogArchivingActive() (XLogArchiveCommand[0] != '\0')
extern bool XLOG_DEBUG;
#endif
-/* OR-able flags for RequestCheckpoint, CreateCheckPoint and subsidiaries */
+/*
+ * OR-able request flag bits for checkpoints. The "cause" bits are used only
+ * for logging purposes. Note: the flags must be defined so that it's
+ * sensible to OR together request flags arising from different requestors.
+ */
+
+/* These directly affect the behavior of CreateCheckPoint and subsidiaries */
#define CHECKPOINT_IS_SHUTDOWN 0x0001 /* Checkpoint is for shutdown */
#define CHECKPOINT_IMMEDIATE 0x0002 /* Do it without delays */
#define CHECKPOINT_FORCE 0x0004 /* Force even if no activity */
-#define CHECKPOINT_WARNONTIME 0x0008 /* Enable CheckPointWarning */
-#define CHECKPOINT_WAIT 0x0010 /* Wait for completion */
+/* These are important to RequestCheckpoint */
+#define CHECKPOINT_WAIT 0x0008 /* Wait for completion */
+/* These indicate the cause of a checkpoint request */
+#define CHECKPOINT_CAUSE_XLOG 0x0010 /* XLOG consumption */
+#define CHECKPOINT_CAUSE_TIME 0x0020 /* Elapsed time */
+
+/* Checkpoint statistics */
+typedef struct CheckpointStatsData
+{
+ TimestampTz ckpt_start_t; /* start of checkpoint */
+ TimestampTz ckpt_write_t; /* start of flushing buffers */
+ TimestampTz ckpt_sync_t; /* start of fsyncs */
+ TimestampTz ckpt_sync_end_t; /* end of fsyncs */
+ TimestampTz ckpt_end_t; /* end of checkpoint */
+
+ int ckpt_bufs_written; /* # of buffers written */
+
+ int ckpt_segs_added; /* # of new xlog segments created */
+ int ckpt_segs_removed; /* # of xlog segments deleted */
+ int ckpt_segs_recycled; /* # of xlog segments recycled */
+} CheckpointStatsData;
+
+extern CheckpointStatsData CheckpointStats;
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
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