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Commit8d8aa93

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Add code to allow profiling of backends on Linux: save and restore the
profiling timer setting across fork(). The correct way to build aprofilable backend on Linux is now gmake PROFILE="-pg -DLINUX_PROFILE"
1 parent78ab803 commit8d8aa93

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1 file changed

+44
-3
lines changed

1 file changed

+44
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‎src/backend/postmaster/postmaster.c‎

Lines changed: 44 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -37,7 +37,7 @@
3737
*
3838
*
3939
* IDENTIFICATION
40-
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.267 2002/02/23 01:31:35 petere Exp $
40+
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.268 2002/03/02 20:46:12 tgl Exp $
4141
*
4242
* NOTES
4343
*
@@ -769,6 +769,14 @@ pmdaemonize(int argc, char *argv[])
769769
{
770770
inti;
771771
pid_tpid;
772+
#ifdefLINUX_PROFILE
773+
structitimervalprof_itimer;
774+
#endif
775+
776+
#ifdefLINUX_PROFILE
777+
/* see comments in BackendStartup */
778+
getitimer(ITIMER_PROF,&prof_itimer);
779+
#endif
772780

773781
pid=fork();
774782
if (pid== (pid_t)-1)
@@ -783,6 +791,10 @@ pmdaemonize(int argc, char *argv[])
783791
_exit(0);
784792
}
785793

794+
#ifdefLINUX_PROFILE
795+
setitimer(ITIMER_PROF,&prof_itimer,NULL);
796+
#endif
797+
786798
MyProcPid=getpid();/* reset MyProcPid to child */
787799

788800
/* GH: If there's no setsid(), we hopefully don't need silent mode.
@@ -1801,13 +1813,16 @@ SignalChildren(int signal)
18011813
/*
18021814
* BackendStartup -- start backend process
18031815
*
1804-
* returns: STATUS_ERROR if the fork/exec failed, STATUS_OK otherwise.
1816+
* returns: STATUS_ERROR if the fork failed, STATUS_OK otherwise.
18051817
*/
18061818
staticint
18071819
BackendStartup(Port*port)
18081820
{
18091821
Backend*bn;/* for backend cleanup */
18101822
pid_tpid;
1823+
#ifdefLINUX_PROFILE
1824+
structitimervalprof_itimer;
1825+
#endif
18111826

18121827
/*
18131828
* Compute the cancel key that will be assigned to this backend. The
@@ -1838,6 +1853,16 @@ BackendStartup(Port *port)
18381853
fflush(stdout);
18391854
fflush(stderr);
18401855

1856+
#ifdefLINUX_PROFILE
1857+
/*
1858+
* Linux's fork() resets the profiling timer in the child process.
1859+
* If we want to profile child processes then we need to save and restore
1860+
* the timer setting. This is a waste of time if not profiling, however,
1861+
* so only do it if commanded by specific -DLINUX_PROFILE switch.
1862+
*/
1863+
getitimer(ITIMER_PROF,&prof_itimer);
1864+
#endif
1865+
18411866
#ifdef__BEOS__
18421867
/* Specific beos actions before backend startup */
18431868
beos_before_backend_startup();
@@ -1849,6 +1874,10 @@ BackendStartup(Port *port)
18491874
{
18501875
intstatus;
18511876

1877+
#ifdefLINUX_PROFILE
1878+
setitimer(ITIMER_PROF,&prof_itimer,NULL);
1879+
#endif
1880+
18521881
#ifdef__BEOS__
18531882
/* Specific beos backend startup actions */
18541883
beos_backend_startup();
@@ -2487,10 +2516,18 @@ SSDataBase(int xlop)
24872516
{
24882517
pid_tpid;
24892518
Backend*bn;
2519+
#ifdefLINUX_PROFILE
2520+
structitimervalprof_itimer;
2521+
#endif
24902522

24912523
fflush(stdout);
24922524
fflush(stderr);
24932525

2526+
#ifdefLINUX_PROFILE
2527+
/* see comments in BackendStartup */
2528+
getitimer(ITIMER_PROF,&prof_itimer);
2529+
#endif
2530+
24942531
#ifdef__BEOS__
24952532
/* Specific beos actions before backend startup */
24962533
beos_before_backend_startup();
@@ -2505,6 +2542,10 @@ SSDataBase(int xlop)
25052542
chardbbuf[ARGV_SIZE];
25062543
charxlbuf[ARGV_SIZE];
25072544

2545+
#ifdefLINUX_PROFILE
2546+
setitimer(ITIMER_PROF,&prof_itimer,NULL);
2547+
#endif
2548+
25082549
#ifdef__BEOS__
25092550
/* Specific beos actions after backend startup */
25102551
beos_backend_startup();
@@ -2603,7 +2644,7 @@ SSDataBase(int xlop)
26032644
*/
26042645
if (xlop==BS_XLOG_CHECKPOINT)
26052646
{
2606-
if (!(bn= (Backend*)calloc(1,sizeof(Backend))))
2647+
if (!(bn= (Backend*)malloc(sizeof(Backend))))
26072648
{
26082649
elog(DEBUG,"CheckPointDataBase: malloc failed");
26092650
ExitPostmaster(1);

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