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Add pgstat_drop_matching_entries() to pgstats

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This allows users of the cumulative statistics to drop entries in the
shared hash stats table, deleting as well local references.  Callers of
this function can optionally define a callback able to filter which
entries to drop, similarly to pgstat_reset_matching_entries() with its
callback do_reset().

pgstat_drop_all_entries() is refactored so as it uses this new function.

Author: Lukas Fitti
Discussion: https://postgr.es/m/CAP53PkwuFbo3NkwZgxwNRMjMfqPEqidD-SggaoQ4ijotBVLJAA@mail.gmail.com
This commit is contained in:
Michael Paquier
2025-01-31 12:27:19 +09:00
parent 1e380fa7d8
commit ce5c620fb6
2 changed files with 32 additions and 1 deletions
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31
src/backend/utils/activity/pgstat_shmem.c
View File

@ -993,19 +993,39 @@ pgstat_drop_entry(PgStat_Kind kind, Oid dboid, uint64 objid)
return freed;
}
/*
* Scan through the shared hashtable of stats, dropping statistics if
* approved by the optional do_drop() function.
*/
void
pgstat_drop_all_entries(void)
pgstat_drop_matching_entries(bool (*do_drop) (PgStatShared_HashEntry *, Datum),
Datum match_data)
{
dshash_seq_status hstat;
PgStatShared_HashEntry *ps;
uint64 not_freed_count = 0;
/* entries are removed, take an exclusive lock */
dshash_seq_init(&hstat, pgStatLocal.shared_hash, true);
while ((ps = dshash_seq_next(&hstat)) != NULL)
{
if (ps->dropped)
continue;
if (do_drop != NULL && !do_drop(ps, match_data))
continue;
/* delete local reference */
if (pgStatEntryRefHash)
{
PgStat_EntryRefHashEntry *lohashent =
pgstat_entry_ref_hash_lookup(pgStatEntryRefHash, ps->key);
if (lohashent)
pgstat_release_entry_ref(lohashent->key, lohashent->entry_ref,
true);
}
if (!pgstat_drop_entry_internal(ps, &hstat))
not_freed_count++;
}
@ -1015,6 +1035,15 @@ pgstat_drop_all_entries(void)
pgstat_request_entry_refs_gc();
}
/*
* Scan through the shared hashtable of stats and drop all entries.
*/
void
pgstat_drop_all_entries(void)
{
pgstat_drop_matching_entries(NULL, 0);
}
static void
shared_stat_reset_contents(PgStat_Kind kind, PgStatShared_Common *header,
TimestampTz ts)

2
src/include/utils/pgstat_internal.h
View File

@ -718,6 +718,8 @@ extern bool pgstat_lock_entry_shared(PgStat_EntryRef *entry_ref, bool nowait);
extern void pgstat_unlock_entry(PgStat_EntryRef *entry_ref);
extern bool pgstat_drop_entry(PgStat_Kind kind, Oid dboid, uint64 objid);
extern void pgstat_drop_all_entries(void);
extern void pgstat_drop_matching_entries(bool (*do_drop) (PgStatShared_HashEntry *, Datum),
Datum match_data);
extern PgStat_EntryRef *pgstat_get_entry_ref_locked(PgStat_Kind kind, Oid dboid, uint64 objid,
bool nowait);
extern void pgstat_reset_entry(PgStat_Kind kind, Oid dboid, uint64 objid, TimestampTz ts);