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Remove redundant gettimeofday() calls to the extent practical without

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changing semantics too much.  statement_timestamp is now set immediately
upon receipt of a client command message, and the various places that used
to do their own gettimeofday() calls to mark command startup are referenced
to that instead.  I have also made stats_command_string use that same
value for pg_stat_activity.query_start for both the command itself and
its eventual replacement by <IDLE> or <idle in transaction>.  There was
some debate about that, but no argument that seemed convincing enough to
justify an extra gettimeofday() call.
This commit is contained in:
Tom Lane
2006-06-20 22:52:00 +00:00
parent 47a37aeebd
commit 27c3e3de09
11 changed files with 269 additions and 226 deletions
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14
src/backend/postmaster/postmaster.c
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@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.487 2006/06/19 01:51:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.488 2006/06/20 22:52:00 tgl Exp $
*
* NOTES
*
@ -99,7 +99,6 @@
#include "commands/async.h"
#include "lib/dllist.h"
#include "libpq/auth.h"
#include "libpq/crypt.h"
#include "libpq/libpq.h"
#include "libpq/pqcomm.h"
#include "libpq/pqsignal.h"
@ -2609,8 +2608,9 @@ BackendInitialize(Port *port)
ClientAuthInProgress = true; /* limit visibility of log messages */
/* save start time for end of session reporting */
gettimeofday(&(port->session_start), NULL);
/* save process start time */
port->SessionStartTime = GetCurrentTimestamp();
port->session_start = timestamptz_to_time_t(port->SessionStartTime);
/* set these to empty in case they are needed before we set them up */
port->remote_host = "";
@ -2749,6 +2749,8 @@ BackendRun(Port *port)
char **av;
int maxac;
int ac;
long secs;
int usecs;
char protobuf[32];
int i;
@ -2758,7 +2760,9 @@ BackendRun(Port *port)
* a new random sequence in the random() library function.
*/
random_seed = 0;
srandom((unsigned int) (MyProcPid ^ port->session_start.tv_usec));
/* slightly hacky way to get integer microseconds part of timestamptz */
TimestampDifference(0, port->SessionStartTime, &secs, &usecs);
srandom((unsigned int) (MyProcPid ^ usecs));
/* ----------------
* Now, build the argv vector that will be given to PostgresMain.