I've done a quick write up for reload time reporting from the
administration TODO. I was a little paranoid with the locking, but
didn't want problems to occur with signals on the postmaster and the
read side.
-George
*** ./doc/src/sgml/func.sgml.orig 2008-04-29 23:47:39.378726574 -0400
--- ./doc/src/sgml/func.sgml 2008-04-29 23:51:12.346237119 -0400
***************
*** 10892,10897 ****
--- 10892,10903 ----
</row>
<row>
+ <entry><literal><function>pg_postmaster_reload_time</function>()</literal></entry>
+ <entry><type>timestamp with time zone</type></entry>
+ <entry>server last reload time</entry>
+ </row>
+
+ <row>
<entry><literal><function>session_user</function></literal></entry>
<entry><type>name</type></entry>
<entry>session user name</entry>
***************
*** 11037,11042 ****
--- 11043,11062 ----
</para>
<indexterm>
+ <primary>pg_postmaster_reload_time</primary>
+ </indexterm>
+
+ <para>
+ <function>pg_postmaster_reload_time</function> returns the
+ <type>timestamp with time zone</type> when the
+ server was last reloaded.
+ </para>
+
+ <indexterm>
+ <primary>version</primary>
+ </indexterm>
+
+ <indexterm>
<primary>version</primary>
</indexterm>
*** ./src/backend/postmaster/postmaster.c.orig 2008-04-29 23:48:07.374455697 -0400
--- ./src/backend/postmaster/postmaster.c 2008-04-29 23:51:12.346237119 -0400
***************
*** 112,117 ****
--- 112,118 ----
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
+ #include "storage/spin.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
***************
*** 390,395 ****
--- 391,398 ----
InheritableSocket pgStatSock;
pid_t PostmasterPid;
TimestampTz PgStartTime;
+ TimestampTz PgReloadTime;
+ slock_t PgReloadTimeLock;
bool redirection_done;
#ifdef WIN32
HANDLE PostmasterHandle;
***************
*** 1008,1013 ****
--- 1011,1018 ----
* Remember postmaster startup time
*/
PgStartTime = GetCurrentTimestamp();
+ PgReloadTime = PgStartTime;
+ SpinLockInit(&PgReloadTimeLock);
/* PostmasterRandom wants its own copy */
gettimeofday(&random_start_time, NULL);
***************
*** 1931,1936 ****
--- 1936,1948 ----
/* Update the starting-point file for future children */
write_nondefault_variables(PGC_SIGHUP);
#endif
+
+ /*
+ * Remember postmaster reload time
+ */
+ SpinLockAcquire(&PgReloadTimeLock);
+ PgReloadTime = GetCurrentTimestamp();
+ SpinLockRelease(&PgReloadTimeLock);
}
PG_SETMASK(&UnBlockSig);
***************
*** 4263,4268 ****
--- 4275,4282 ----
param->PostmasterPid = PostmasterPid;
param->PgStartTime = PgStartTime;
+ param->PgReloadTime = PgReloadTime;
+ param->PgReloadTimeLock = PgReloadTimeLock;
param->redirection_done = redirection_done;
*** ./src/backend/tcop/postgres.c.orig 2008-04-29 23:48:58.866600196 -0400
--- ./src/backend/tcop/postgres.c 2008-04-29 23:51:12.346237119 -0400
***************
*** 58,63 ****
--- 58,64 ----
#include "storage/ipc.h"
#include "storage/proc.h"
#include "storage/sinval.h"
+ #include "storage/spin.h"
#include "tcop/fastpath.h"
#include "tcop/pquery.h"
#include "tcop/tcopprot.h"
***************
*** 3373,3380 ****
/*
* Remember stand-alone backend startup time
*/
! if (!IsUnderPostmaster)
PgStartTime = GetCurrentTimestamp();
/*
* POSTGRES main processing loop begins here
--- 3374,3384 ----
/*
* Remember stand-alone backend startup time
*/
! if (!IsUnderPostmaster) {
PgStartTime = GetCurrentTimestamp();
+ PgReloadTime = PgStartTime;
+ SpinLockInit(&PgReloadTimeLock);
+ }
/*
* POSTGRES main processing loop begins here
***************
*** 3550,3555 ****
--- 3554,3566 ----
{
got_SIGHUP = false;
ProcessConfigFile(PGC_SIGHUP);
+
+ /*
+ * Remember postmaster reload time
+ */
+ SpinLockAcquire(&PgReloadTimeLock);
+ PgReloadTime = GetCurrentTimestamp();
+ SpinLockRelease(&PgReloadTimeLock);
}
/*
*** ./src/backend/utils/adt/timestamp.c.orig 2008-04-29 23:49:46.359354923 -0400
--- ./src/backend/utils/adt/timestamp.c 2008-04-29 23:51:12.346237119 -0400
***************
*** 27,32 ****
--- 27,33 ----
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "parser/scansup.h"
+ #include "storage/spin.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
***************
*** 42,47 ****
--- 43,50 ----
/* Set at postmaster start */
TimestampTz PgStartTime;
+ TimestampTz PgReloadTime;
+ slock_t PgReloadTimeLock;
static TimeOffset time2t(const int hour, const int min, const int sec, const fsec_t fsec);
***************
*** 1162,1167 ****
--- 1165,1180 ----
PG_RETURN_TIMESTAMPTZ(PgStartTime);
}
+ Datum
+ pgsql_postmaster_reload_time(PG_FUNCTION_ARGS)
+ {
+ TimestampTz timestamp;
+ SpinLockAcquire(&PgReloadTimeLock);
+ timestamp = PgReloadTime;
+ SpinLockRelease(&PgReloadTimeLock);
+ PG_RETURN_TIMESTAMPTZ(timestamp);
+ }
+
/*
* GetCurrentTimestamp -- get the current operating system time
*
*** ./src/include/catalog/pg_proc.h.orig 2008-04-29 23:50:10.355694154 -0400
--- ./src/include/catalog/pg_proc.h 2008-04-29 23:51:12.346237119 -0400
***************
*** 3924,3929 ****
--- 3924,3932 ----
/* start time function */
DATA(insert OID = 2560 ( pg_postmaster_start_time PGNSP PGUID 12 1 0 f f t f s 0 1184 "" _null_ _null_ _null_ pgsql_postmaster_start_time - _null_ _null_ ));
DESCR("postmaster start time");
+ /* reload time function */
+ DATA(insert OID = 3775 ( pg_postmaster_reload_time PGNSP PGUID 12 1 0 f f t f s 0 1184 "" _null_ _null_ _null_ pgsql_postmaster_reload_time - _null_ _null_ ));
+ DESCR("postmaster reload time");
/* new functions for Y-direction rtree opclasses */
DATA(insert OID = 2562 ( box_below PGNSP PGUID 12 1 0 f f t f i 2 16 "603 603" _null_ _null_ _null_ box_below - _null_ _null_ ));
*** ./src/include/utils/timestamp.h.orig 2008-04-29 23:50:58.348372498 -0400
--- ./src/include/utils/timestamp.h 2008-04-29 23:51:12.346237119 -0400
***************
*** 22,27 ****
--- 22,28 ----
#ifdef HAVE_INT64_TIMESTAMP
#include "utils/int8.h"
#endif
+ #include "storage/s_lock.h"
/*
* Timestamp represents absolute time.
***************
*** 195,200 ****
--- 196,205 ----
/* Set at postmaster start */
extern TimestampTz PgStartTime;
+ /* Set at postmaster reload */
+ extern TimestampTz PgReloadTime;
+ /* Ensure safe concurrent acess to reload time */
+ extern slock_t PgReloadTimeLock;
/*
***************
*** 304,309 ****
--- 309,315 ----
extern Datum clock_timestamp(PG_FUNCTION_ARGS);
extern Datum pgsql_postmaster_start_time(PG_FUNCTION_ARGS);
+ extern Datum pgsql_postmaster_reload_time(PG_FUNCTION_ARGS);
/* Internal routines (not fmgr-callable) */
--
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