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PG-488: Revert pg_stat_monitor: Overflow management. (#338)

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PG-488: Revert pg_stat_monitor: Overflow management.

This patch does not work for  < PostgreSQL - 15. More work required.
This commit is contained in:
Ibrar Ahmed
2022-12-22 19:15:14 +05:00
committed by GitHub
parent 7c5ad48276
commit 802774a2a7
3 changed files with 513 additions and 246 deletions
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44
pg_stat_monitor.h
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@@ -27,9 +27,6 @@
#include <sys/time.h>
#include <sys/resource.h>
#include "lib/dshash.h"
#include "utils/dsa.h"
#include "access/hash.h"
#include "catalog/pg_authid.h"
#include "executor/instrument.h"
@@ -182,6 +179,20 @@ typedef struct CallTime
double sum_var_time; /* sum of variances in execution time in msec */
} CallTime;
/*
* Entry type for queries hash table (query ID).
*
* We use a hash table to keep track of query IDs that have their
* corresponding query text added to the query buffer (pgsm_query_shared_buffer).
*
* This allow us to avoid adding duplicated queries to the buffer, therefore
* leaving more space for other queries and saving some CPU.
*/
typedef struct pgssQueryEntry
{
uint64 queryid; /* query identifier, also the key. */
size_t query_pos; /* query location within query buffer */
} pgssQueryEntry;
typedef struct PlanInfo
{
@@ -205,7 +216,6 @@ typedef struct pgssHashKey
typedef struct QueryInfo
{
uint64 parentid; /* parent queryid of current query */
dsa_pointer parent_query;
int64 type; /* type of query, options are query, info,
* warning, error, fatal */
char application_name[APPLICATIONNAME_LEN];
@@ -312,7 +322,7 @@ typedef struct pgssEntry
Counters counters; /* the statistics for this query */
int encoding; /* query text encoding */
slock_t mutex; /* protects the counters only */
dsa_pointer query_pos; /* query location within query buffer */
size_t query_pos; /* query location within query buffer */
} pgssEntry;
/*
@@ -343,19 +353,10 @@ typedef struct pgssSharedState
* This allows us to avoid having a large file on disk that would also
* slowdown queries to the pg_stat_monitor view.
*/
bool overflow;
size_t n_bucket_cycles;
int hash_tranche_id;
void *raw_dsa_area;
dshash_table_handle hash_handle;
} pgssSharedState;
typedef struct pgsmLocalState
{
pgssSharedState *shared_pgssState;
dsa_area *dsa;
dshash_table *shared_hash;
}pgsmLocalState;
#define ResetSharedState(x) \
do { \
x->cur_median_usage = ASSUMED_MEDIAN_INIT; \
@@ -417,22 +418,27 @@ void init_guc(void);
GucVariable *get_conf(int i);
/* hash_create.c */
dsa_area *get_dsa_area_for_query_text(void);
dshash_table *get_pgssHash(void);
void pgsm_attach_shmem(void);
bool IsHashInitialize(void);
void pgss_shmem_startup(void);
void pgss_shmem_shutdown(int code, Datum arg);
int pgsm_get_bucket_size(void);
pgssSharedState *pgsm_get_ss(void);
HTAB *pgsm_get_plan_hash(void);
HTAB *pgsm_get_hash(void);
HTAB *pgsm_get_query_hash(void);
HTAB *pgsm_get_plan_hash(void);
void hash_entry_reset(void);
void hash_query_entryies_reset(void);
void hash_query_entries();
void hash_query_entry_dealloc(int new_bucket_id, int old_bucket_id, unsigned char *query_buffer[]);
void hash_entry_dealloc(int new_bucket_id, int old_bucket_id, unsigned char *query_buffer);
pgssEntry *hash_entry_alloc(pgssSharedState *pgss, pgssHashKey *key, int encoding);
Size pgsm_ShmemSize(void);
Size hash_memsize(void);
int read_query_buffer(int bucket_id, uint64 queryid, char *query_txt, size_t pos);
uint64 read_query(unsigned char *buf, uint64 queryid, char *query, size_t pos);
void pgss_startup(void);
void set_qbuf(unsigned char *);
/* hash_query.c */
void pgss_startup(void);