@ -9,11 +9,11 @@
* - Add some automatic call for pgstat vacuuming .
*
* - Add a pgstat config column to pg_database , so this
* entire thing can be enabled / disabled on a per db base .
* entire thing can be enabled / disabled on a per db basis .
*
* Copyright ( c ) 2001 - 2003 , PostgreSQL Global Development Group
*
* $ PostgreSQL : pgsql / src / backend / postmaster / pgstat . c , v 1.71 2004 / 05 / 24 02 : 47 : 47 momjian Exp $
* $ PostgreSQL : pgsql / src / backend / postmaster / pgstat . c , v 1.72 2004 / 05 / 28 05 : 12 : 58 tgl Exp $
* - - - - - - - - - -
*/
# include "postgres.h"
@ -51,13 +51,6 @@
# include "utils/ps_status.h"
# include "utils/syscache.h"
# ifdef EXEC_BACKEND
# include "utils/guc.h"
# endif
# ifdef WIN32
extern pid_t win32_forkexec ( const char * path , char * argv [ ] ) ;
# endif
/* ----------
* GUC parameters
@ -107,8 +100,8 @@ static HTAB *pgStatBeDead = NULL;
static PgStat_StatBeEntry * pgStatBeTable = NULL ;
static int pgStatNumBackends = 0 ;
static char pgStat_tmpfname [ MAXPGPATH ] ;
static char pgStat_fname [ MAXPGPATH ] ;
static char pgStat_tmpfname [ MAXPGPATH ] ;
/* ----------
@ -116,12 +109,20 @@ static char pgStat_fname[MAXPGPATH];
* - - - - - - - - - -
*/
# ifdef EXEC_BACKEND
typedef enum STATS_PROCESS_TYPE
{
STAT_PROC_BUFFER ,
STAT_PROC_COLLECTOR
} STATS_PROCESS_TYPE ;
static pid_t pgstat_forkexec ( STATS_PROCESS_TYPE procType ) ;
static void pgstat_parseArgs ( PGSTAT_FORK_ARGS ) ;
static void pgstat_parseArgs ( int argc , char * argv [ ] ) ;
# endif
NON_EXEC_STATIC void pgstat_main ( PGSTAT_FORK_ARGS ) ;
NON_EXEC_STATIC void pgstat_mainChild ( PGSTAT_FORK_ARGS ) ;
static void pgstat_mainInit ( void ) ;
NON_EXEC_STATIC void PgstatBufferMain ( int argc , char * argv [ ] ) ;
NON_EXEC_STATIC void PgstatCollectorMain ( int argc , char * argv [ ] ) ;
static void pgstat_recvbuffer ( void ) ;
static void pgstat_die ( SIGNAL_ARGS ) ;
@ -150,18 +151,6 @@ static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/
# ifdef EXEC_BACKEND
void
pgstat_init_forkexec_backend ( void )
{
Assert ( DataDir ! = NULL ) ;
snprintf ( pgStat_fname , MAXPGPATH ,
PGSTAT_STAT_FILENAME , DataDir ) ;
}
# endif
/* ----------
* pgstat_init ( ) -
*
@ -195,12 +184,12 @@ pgstat_init(void)
pgstat_collect_startcollector = true ;
/*
* Initialize the filenames for the status reports .
* Initialize the filename for the status reports . ( In the EXEC_BACKEND
* case , this only sets the value in the postmaster . The collector
* subprocess will recompute the value for itself , and individual
* backends must do so also if they want to access the file . )
*/
snprintf ( pgStat_tmpfname , MAXPGPATH ,
PGSTAT_STAT_TMPFILE , DataDir , getpid ( ) ) ;
snprintf ( pgStat_fname , MAXPGPATH ,
PGSTAT_STAT_FILENAME , DataDir ) ;
snprintf ( pgStat_fname , MAXPGPATH , PGSTAT_STAT_FILENAME , DataDir ) ;
/*
* If we don ' t have to start a collector or should reset the collected
@ -441,112 +430,83 @@ startup_failed:
# ifdef EXEC_BACKEND
/* ----------
/*
* pgstat_forkexec ( ) -
*
* Used to f ormatup the arglist for , then fork and exec , statistics
* F ormatup the arglist for , then fork and exec , statistics
* ( buffer and collector ) processes
*
*/
static pid_t
pgstat_forkexec ( STATS_PROCESS_TYPE procType )
{
pid_t pid ;
char * av [ 15 ] ;
char * av [ 12 ] ;
int ac = 0 , bufc = 0 , i ;
char pgstatBuf [ 12 ] [ MAXPGPATH ] ;
char pgstatBuf [ 7 ] [ 32 ] ;
av [ ac + + ] = " postgres " ;
switch ( procType )
{
case STAT_PROC_BUFFER :
av [ ac + + ] = " -statB uf " ;
av [ ac + + ] = " -forkb uf " ;
break ;
case STAT_PROC_COLLECTOR :
av [ ac + + ] = " -statC ol " ;
av [ ac + + ] = " -forkc ol " ;
break ;
default :
Assert ( false ) ;
}
/* Sockets + pipes */
bufc = 0 ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , pgStatSock ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , pgStatPmPipe [ 0 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , pgStatPmPipe [ 1 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , pgStatCollectorPmPipe [ 0 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , pgStatCollectorPmPipe [ 1 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , pgStatPipe [ 0 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , pgStatPipe [ 1 ] ) ;
/* + misc */
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " %d " , MaxBackends ) ;
/* + the pstat file names, and postgres pathname */
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " \" %s \" " , pgStat_tmpfname ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " \" %s \" " , pgStat_fname ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " \" %s \" " , postgres_exec_path ) ;
snprintf ( pgstatBuf [ bufc + + ] , MAXPGPATH , " \" %s \" " , DataDir ) ;
av [ ac + + ] = NULL ; /* filled in by postmaster_forkexec */
/* postgres_exec_path is not passed by write_backend_variables */
av [ ac + + ] = postgres_exec_path ;
/* Sockets + pipes (those not passed by write_backend_variables) */
snprintf ( pgstatBuf [ bufc + + ] , 32 , " %d " , pgStatPmPipe [ 0 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , 32 , " %d " , pgStatPmPipe [ 1 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , 32 , " %d " , pgStatCollectorPmPipe [ 0 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , 32 , " %d " , pgStatCollectorPmPipe [ 1 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , 32 , " %d " , pgStatPipe [ 0 ] ) ;
snprintf ( pgstatBuf [ bufc + + ] , 32 , " %d " , pgStatPipe [ 1 ] ) ;
/* Add to the arg list */
Assert ( bufc < = lengthof ( pgstatBuf ) ) ;
for ( i = 0 ; i < bufc ; i + + )
av [ ac + + ] = pgstatBuf [ i ] ;
av [ ac + + ] = NULL ;
Assert ( ac < = lengthof ( av ) ) ;
av [ ac ] = NULL ;
Assert ( ac < lengthof ( av ) ) ;
/* Fire off execv in child */
# ifdef WIN32
pid = win32_forkexec ( postgres_exec_path , av ) ;
# else
if ( ( pid = fork ( ) ) = = 0 & & ( execv ( postgres_exec_path , av ) = = - 1 ) )
/* FIXME: [fork/exec] suggestions for what to do here? Can't call elog... */
abort ( ) ;
# endif
return pid ; /* Parent returns pid */
return postmaster_forkexec ( ac , av ) ;
}
/* ----------
/*
* pgstat_parseArgs ( ) -
*
* Used to unformat the arglist for exec ' ed statistics
* Extract data from the arglist for exec ' ed statistics
* ( buffer and collector ) processes
*
*/
static void
pgstat_parseArgs ( PGSTAT_FORK_ARGS )
pgstat_parseArgs ( int argc , char * argv [ ] )
{
Assert ( argc = = 14 ) ;
if ( find_my_exec ( argv [ 0 ] , my_exec_path ) < 0 )
elog ( FATAL ,
gettext ( " %s: could not locate my own executable path " ) ,
argv [ 0 ] ) ;
get_pkglib_path ( my_exec_path , pkglib_path ) ;
Assert ( argc = = 10 ) ;
argc = 2 ;
pgStatSock = atoi ( argv [ argc + + ] ) ;
argc = 3 ;
StrNCpy ( postgres_exec_path , argv [ argc + + ] , MAXPGPATH ) ;
pgStatPmPipe [ 0 ] = atoi ( argv [ argc + + ] ) ;
pgStatPmPipe [ 1 ] = atoi ( argv [ argc + + ] ) ;
pgStatCollectorPmPipe [ 0 ] = atoi ( argv [ argc + + ] ) ;
pgStatCollectorPmPipe [ 1 ] = atoi ( argv [ argc + + ] ) ;
pgStatPipe [ 0 ] = atoi ( argv [ argc + + ] ) ;
pgStatPipe [ 1 ] = atoi ( argv [ argc + + ] ) ;
MaxBackends = atoi ( argv [ argc + + ] ) ;
StrNCpy ( pgStat_tmpfname , argv [ argc + + ] , MAXPGPATH ) ;
StrNCpy ( pgStat_fname , argv [ argc + + ] , MAXPGPATH ) ;
StrNCpy ( postgres_exec_path , argv [ argc + + ] , MAXPGPATH ) ;
DataDir = strdup ( argv [ argc + + ] ) ;
read_nondefault_variables ( ) ;
}
# endif
# endif /* EXEC_BACKEND */
/* ----------
* pgstat_start ( ) -
@ -638,7 +598,7 @@ pgstat_start(void)
/* Drop our connection to postmaster's shared memory, as well */
PGSharedMemoryDetach ( ) ;
pgstat_main ( ) ;
PgstatBufferMain ( 0 , NULL ) ;
break ;
# endif
@ -1443,26 +1403,20 @@ pgstat_send(void *msg, int len)
}
/* ------------------------------------------------------------
* Local functions implementing the statistics collector itself follow
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/* ----------
* PgstatBufferMain ( ) -
*
* Start up the statistics buffer process . This is the body of the
* postmaster child process .
*
* The argc / argv parameters are valid only in EXEC_BACKEND case .
* - - - - - - - - - -
*/
static void
pgstat_mainInit ( void )
NON_EXEC_STATIC void
PgstatBufferMain ( int argc , char * argv [ ] )
{
IsUnderPostmaster = true ; /* we are a postmaster subprocess now */
# ifdef EXEC_BACKEND
/* In EXEC case we will not have inherited these settings */
IsPostmasterEnvironment = true ;
whereToSendOutput = None ;
/* Setup global context */
MemoryContextInit ( ) ; /* before any elog'ing can occur */
InitializeGUCOptions ( ) ;
# endif
MyProcPid = getpid ( ) ; /* reset MyProcPid */
/* Lose the postmaster's on-exit routines */
@ -1485,20 +1439,8 @@ pgstat_mainInit(void)
pqsignal ( SIGTTOU , SIG_DFL ) ;
pqsignal ( SIGCONT , SIG_DFL ) ;
pqsignal ( SIGWINCH , SIG_DFL ) ;
}
/* unblock will happen in pgstat_recvbuffer */
/* ----------
* pgstat_main ( ) -
*
* Start up the statistics collector itself . This is the body of the
* postmaster child process .
* - - - - - - - - - -
*/
NON_EXEC_STATIC void
pgstat_main ( PGSTAT_FORK_ARGS )
{
pgstat_mainInit ( ) ; /* Note: for *both* EXEC_BACKEND and regular cases */
# ifdef EXEC_BACKEND
pgstat_parseArgs ( argc , argv ) ;
# endif
@ -1547,7 +1489,7 @@ pgstat_main(PGSTAT_FORK_ARGS)
# ifndef EXEC_BACKEND
case 0 :
/* child becomes collector process */
pgstat_mainChild ( ) ;
PgstatCollectorMain ( 0 , NULL ) ;
break ;
# endif
@ -1560,8 +1502,17 @@ pgstat_main(PGSTAT_FORK_ARGS)
}
/* ----------
* PgstatCollectorMain ( ) -
*
* Start up the statistics collector itself . This is the body of the
* postmaster grandchild process .
*
* The argc / argv parameters are valid only in EXEC_BACKEND case .
* - - - - - - - - - -
*/
NON_EXEC_STATIC void
pgstat_mainChild ( PGSTAT_FORK_ARGS )
PgstatCollectorMain ( int argc , char * argv [ ] )
{
PgStat_Msg msg ;
fd_set rfds ;
@ -1574,29 +1525,52 @@ pgstat_mainChild(PGSTAT_FORK_ARGS)
bool need_statwrite ;
HASHCTL hash_ctl ;
MyProcPid = getpid ( ) ; /* reset MyProcPid */
/*
* Reset signal handling . With the exception of restoring default
* SIGCHLD handling , this is a no - op in the non - EXEC_BACKEND case
* because we ' ll have inherited these settings from the buffer process ;
* but it ' s not a no - op for EXEC_BACKEND .
*/
pqsignal ( SIGHUP , SIG_IGN ) ;
pqsignal ( SIGINT , SIG_IGN ) ;
pqsignal ( SIGTERM , SIG_IGN ) ;
pqsignal ( SIGQUIT , SIG_IGN ) ;
pqsignal ( SIGALRM , SIG_IGN ) ;
pqsignal ( SIGPIPE , SIG_IGN ) ;
pqsignal ( SIGUSR1 , SIG_IGN ) ;
pqsignal ( SIGUSR2 , SIG_IGN ) ;
pqsignal ( SIGCHLD , SIG_DFL ) ;
pqsignal ( SIGTTIN , SIG_DFL ) ;
pqsignal ( SIGTTOU , SIG_DFL ) ;
pqsignal ( SIGCONT , SIG_DFL ) ;
pqsignal ( SIGWINCH , SIG_DFL ) ;
PG_SETMASK ( & UnBlockSig ) ;
# ifdef EXEC_BACKEND
pgstat_mainInit ( ) ; /* Note: only in EXEC_BACKEND case */
pgstat_parseArgs ( argc , argv ) ;
# else
MyProcPid = getpid ( ) ; /* reset MyProcPid */
# endif
/* Close unwanted files */
closesocket ( pgStatPipe [ 1 ] ) ;
closesocket ( pgStatSock ) ;
pmPipe = pgStatCollectorPmPipe [ 0 ] ;
/*
* In the child we can have default SIGCHLD handling ( in case we want
* to call system ( ) here . . . )
*/
pqsignal ( SIGCHLD , SIG_DFL ) ;
/*
* Identify myself via ps
*/
init_ps_display ( " stats collector process " , " " , " " ) ;
set_ps_display ( " " ) ;
/*
* Initialize filenames needed for status reports .
*/
snprintf ( pgStat_fname , MAXPGPATH , PGSTAT_STAT_FILENAME , DataDir ) ;
/* tmpfname need only be set correctly in this process */
snprintf ( pgStat_tmpfname , MAXPGPATH , PGSTAT_STAT_TMPFILE ,
DataDir , getpid ( ) ) ;
/*
* Arrange to write the initial status file right away
*/
@ -2549,6 +2523,18 @@ pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
if ( betab ! = NULL )
* betab = NULL ;
/*
* In EXEC_BACKEND case , we won ' t have inherited pgStat_fname from
* postmaster , so compute it first time through .
*/
# ifdef EXEC_BACKEND
if ( pgStat_fname [ 0 ] = = ' \0 ' )
{
Assert ( DataDir ! = NULL ) ;
snprintf ( pgStat_fname , MAXPGPATH , PGSTAT_STAT_FILENAME , DataDir ) ;
}
# endif
/*
* Try to open the status file . If it doesn ' t exist , the backends
* simply return zero for anything and the collector simply starts
Tom Lane
22 years ago