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Add code to allow profiling of backends on Linux: save and restore the

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profiling timer setting across fork().  The correct way to build a
profilable backend on Linux is now gmake PROFILE="-pg -DLINUX_PROFILE"
This commit is contained in:
Tom Lane
2002-03-02 20:46:12 +00:00
parent 78ab803402
commit 8d8aa931ef
1 changed files with 44 additions and 3 deletions
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47
src/backend/postmaster/postmaster.c
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@ -37,7 +37,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.267 2002/02/23 01:31:35 petere Exp $ * $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.268 2002/03/02 20:46:12 tgl Exp $
* *
* NOTES * NOTES
* *
@ -769,6 +769,14 @@ pmdaemonize(int argc, char *argv[])
{ {
int i; int i;
pid_t pid; pid_t pid;
#ifdef LINUX_PROFILE
struct itimerval prof_itimer;
#endif
#ifdef LINUX_PROFILE
/* see comments in BackendStartup */
getitimer(ITIMER_PROF, &prof_itimer);
#endif
pid = fork(); pid = fork();
if (pid == (pid_t) -1) if (pid == (pid_t) -1)
@ -783,6 +791,10 @@ pmdaemonize(int argc, char *argv[])
_exit(0); _exit(0);
} }
#ifdef LINUX_PROFILE
setitimer(ITIMER_PROF, &prof_itimer, NULL);
#endif
MyProcPid = getpid(); /* reset MyProcPid to child */ MyProcPid = getpid(); /* reset MyProcPid to child */
/* GH: If there's no setsid(), we hopefully don't need silent mode. /* GH: If there's no setsid(), we hopefully don't need silent mode.
@ -1801,13 +1813,16 @@ SignalChildren(int signal)
/* /*
* BackendStartup -- start backend process * BackendStartup -- start backend process
* *
* returns: STATUS_ERROR if the fork/exec failed, STATUS_OK otherwise. * returns: STATUS_ERROR if the fork failed, STATUS_OK otherwise.
*/ */
static int static int
BackendStartup(Port *port) BackendStartup(Port *port)
{ {
Backend *bn; /* for backend cleanup */ Backend *bn; /* for backend cleanup */
pid_t pid; pid_t pid;
#ifdef LINUX_PROFILE
struct itimerval prof_itimer;
#endif
/* /*
* Compute the cancel key that will be assigned to this backend. The * Compute the cancel key that will be assigned to this backend. The
@ -1838,6 +1853,16 @@ BackendStartup(Port *port)
fflush(stdout); fflush(stdout);
fflush(stderr); fflush(stderr);
#ifdef LINUX_PROFILE
/*
* Linux's fork() resets the profiling timer in the child process.
* If we want to profile child processes then we need to save and restore
* the timer setting. This is a waste of time if not profiling, however,
* so only do it if commanded by specific -DLINUX_PROFILE switch.
*/
getitimer(ITIMER_PROF, &prof_itimer);
#endif
#ifdef __BEOS__ #ifdef __BEOS__
/* Specific beos actions before backend startup */ /* Specific beos actions before backend startup */
beos_before_backend_startup(); beos_before_backend_startup();
@ -1849,6 +1874,10 @@ BackendStartup(Port *port)
{ {
int status; int status;
#ifdef LINUX_PROFILE
setitimer(ITIMER_PROF, &prof_itimer, NULL);
#endif
#ifdef __BEOS__ #ifdef __BEOS__
/* Specific beos backend startup actions */ /* Specific beos backend startup actions */
beos_backend_startup(); beos_backend_startup();
@ -2487,10 +2516,18 @@ SSDataBase(int xlop)
{ {
pid_t pid; pid_t pid;
Backend *bn; Backend *bn;
#ifdef LINUX_PROFILE
struct itimerval prof_itimer;
#endif
fflush(stdout); fflush(stdout);
fflush(stderr); fflush(stderr);
#ifdef LINUX_PROFILE
/* see comments in BackendStartup */
getitimer(ITIMER_PROF, &prof_itimer);
#endif
#ifdef __BEOS__ #ifdef __BEOS__
/* Specific beos actions before backend startup */ /* Specific beos actions before backend startup */
beos_before_backend_startup(); beos_before_backend_startup();
@ -2505,6 +2542,10 @@ SSDataBase(int xlop)
char dbbuf[ARGV_SIZE]; char dbbuf[ARGV_SIZE];
char xlbuf[ARGV_SIZE]; char xlbuf[ARGV_SIZE];
#ifdef LINUX_PROFILE
setitimer(ITIMER_PROF, &prof_itimer, NULL);
#endif
#ifdef __BEOS__ #ifdef __BEOS__
/* Specific beos actions after backend startup */ /* Specific beos actions after backend startup */
beos_backend_startup(); beos_backend_startup();
@ -2603,7 +2644,7 @@ SSDataBase(int xlop)
*/ */
if (xlop == BS_XLOG_CHECKPOINT) if (xlop == BS_XLOG_CHECKPOINT)
{ {
if (!(bn = (Backend *) calloc(1, sizeof(Backend)))) if (!(bn = (Backend *) malloc(sizeof(Backend))))
{ {
elog(DEBUG, "CheckPointDataBase: malloc failed"); elog(DEBUG, "CheckPointDataBase: malloc failed");
ExitPostmaster(1); ExitPostmaster(1);