Remove some unnecessary tests of pgstat_track_counts.

We may as well make pgstat_count_heap_scan() and related macros just count
whenever rel->pgstat_info isn't null.  Testing pgstat_track_counts buys
nothing at all in the normal case where that flag is ON; and when it's OFF,
the pgstat_info link will be null, so it's still a useless test.

This change is unlikely to buy any noticeable performance improvement,
but a cycle shaved is a cycle earned; and my investigations earlier today
convinced me that we're down to the point where individual instructions in
the inner execution loops are starting to matter.

diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index 483d7af..a1ad342 100644 (file)
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -1660,7 +1660,7 @@ pgstat_count_heap_insert(Relation rel)
 {
        PgStat_TableStatus *pgstat_info = rel->pgstat_info;
 
-       if (pgstat_track_counts && pgstat_info != NULL)
+       if (pgstat_info != NULL)
        {
                /* We have to log the effect at the proper transactional level */
                int                     nest_level = GetCurrentTransactionNestLevel();
@@ -1681,7 +1681,7 @@ pgstat_count_heap_update(Relation rel, bool hot)
 {
        PgStat_TableStatus *pgstat_info = rel->pgstat_info;
 
-       if (pgstat_track_counts && pgstat_info != NULL)
+       if (pgstat_info != NULL)
        {
                /* We have to log the effect at the proper transactional level */
                int                     nest_level = GetCurrentTransactionNestLevel();
@@ -1706,7 +1706,7 @@ pgstat_count_heap_delete(Relation rel)
 {
        PgStat_TableStatus *pgstat_info = rel->pgstat_info;
 
-       if (pgstat_track_counts && pgstat_info != NULL)
+       if (pgstat_info != NULL)
        {
                /* We have to log the effect at the proper transactional level */
                int                     nest_level = GetCurrentTransactionNestLevel();
@@ -1732,7 +1732,7 @@ pgstat_update_heap_dead_tuples(Relation rel, int delta)
 {
        PgStat_TableStatus *pgstat_info = rel->pgstat_info;
 
-       if (pgstat_track_counts && pgstat_info != NULL)
+       if (pgstat_info != NULL)
                pgstat_info->t_counts.t_delta_dead_tuples -= delta;
 }
 

diff --git a/src/include/pgstat.h b/src/include/pgstat.h
index 8754143..d49bd80 100644 (file)
--- a/src/include/pgstat.h
+++ b/src/include/pgstat.h
@@ -705,37 +705,37 @@ extern void pgstat_initstats(Relation rel);
 
 #define pgstat_count_heap_scan(rel)                                                                    \
        do {                                                                                                                    \
-               if (pgstat_track_counts && (rel)->pgstat_info != NULL)          \
+               if ((rel)->pgstat_info != NULL)                                                         \
                        (rel)->pgstat_info->t_counts.t_numscans++;                              \
        } while (0)
 #define pgstat_count_heap_getnext(rel)                                                         \
        do {                                                                                                                    \
-               if (pgstat_track_counts && (rel)->pgstat_info != NULL)          \
+               if ((rel)->pgstat_info != NULL)                                                         \
                        (rel)->pgstat_info->t_counts.t_tuples_returned++;               \
        } while (0)
 #define pgstat_count_heap_fetch(rel)                                                           \
        do {                                                                                                                    \
-               if (pgstat_track_counts && (rel)->pgstat_info != NULL)          \
+               if ((rel)->pgstat_info != NULL)                                                         \
                        (rel)->pgstat_info->t_counts.t_tuples_fetched++;                \
        } while (0)
 #define pgstat_count_index_scan(rel)                                                           \
        do {                                                                                                                    \
-               if (pgstat_track_counts && (rel)->pgstat_info != NULL)          \
+               if ((rel)->pgstat_info != NULL)                                                         \
                        (rel)->pgstat_info->t_counts.t_numscans++;                              \
        } while (0)
 #define pgstat_count_index_tuples(rel, n)                                                      \
        do {                                                                                                                    \
-               if (pgstat_track_counts && (rel)->pgstat_info != NULL)          \
+               if ((rel)->pgstat_info != NULL)                                                         \
                        (rel)->pgstat_info->t_counts.t_tuples_returned += (n);  \
        } while (0)
 #define pgstat_count_buffer_read(rel)                                                          \
        do {                                                                                                                    \
-               if (pgstat_track_counts && (rel)->pgstat_info != NULL)          \
+               if ((rel)->pgstat_info != NULL)                                                         \
                        (rel)->pgstat_info->t_counts.t_blocks_fetched++;                \
        } while (0)
 #define pgstat_count_buffer_hit(rel)                                                           \
        do {                                                                                                                    \
-               if (pgstat_track_counts && (rel)->pgstat_info != NULL)          \
+               if ((rel)->pgstat_info != NULL)                                                         \
                        (rel)->pgstat_info->t_counts.t_blocks_hit++;                    \
        } while (0)