diff options
Diffstat (limited to 'src/include/utils/pgstat_internal.h')
| -rw-r--r-- | src/include/utils/pgstat_internal.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/include/utils/pgstat_internal.h b/src/include/utils/pgstat_internal.h index bf75ebcef31..88d09ea20ba 100644 --- a/src/include/utils/pgstat_internal.h +++ b/src/include/utils/pgstat_internal.h @@ -232,6 +232,12 @@ typedef struct PgStat_KindInfo bool write_to_file:1; /* + * Should the number of entries be tracked? For variable-numbered stats, + * to update its PgStat_ShmemControl.entry_counts. + */ + bool track_entry_count:1; + + /* * The size of an entry in the shared stats hash table (pointed to by * PgStatShared_HashEntry->body). For fixed-numbered statistics, this is * the size of an entry in PgStat_ShmemControl->custom_data. @@ -501,6 +507,16 @@ typedef struct PgStat_ShmemControl pg_atomic_uint64 gc_request_count; /* + * Counters for the number of entries associated to a single stats kind + * that uses variable-numbered objects stored in the shared hash table. + * These counters can be enabled on a per-kind basis, when + * track_entry_count is set. This counter is incremented each time a new + * entry is created (not reused) in the shared hash table, and is + * decremented each time an entry is freed from the shared hash table. + */ + pg_atomic_uint64 entry_counts[PGSTAT_KIND_MAX]; + + /* * Stats data for fixed-numbered objects. */ PgStatShared_Archiver archiver; @@ -926,6 +942,17 @@ pgstat_get_entry_data(PgStat_Kind kind, PgStatShared_Common *entry) } /* + * Returns the number of entries counted for a stats kind. + */ +static inline uint64 +pgstat_get_entry_count(PgStat_Kind kind) +{ + Assert(pgstat_get_kind_info(kind)->track_entry_count); + + return pg_atomic_read_u64(&pgStatLocal.shmem->entry_counts[kind - 1]); +} + +/* * Returns a pointer to the shared memory area of custom stats for * fixed-numbered statistics. */ |