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PG-585: pg_stat_monitor: Add code comments to the DSA related funcs.. (#360)

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Adding code comments for the DSA related functionality.
This commit is contained in:
Muhammad Usama
2023-01-23 14:36:23 +05:00
committed by GitHub
parent dfd41519cf
commit 5648b99eee
3 changed files with 92 additions and 19 deletions
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pg_stat_monitor.c
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@@ -1327,16 +1327,20 @@ pgss_update_entry(pgssEntry *entry,
strlen(nested_query_txts[exec_nested_level - 1]): 0;
e->counters.info.parentid = nested_queryids[exec_nested_level - 1];
e->counters.info.parent_query = InvalidDsaPointer;
/* If we have a parent query, store it in the raw dsa area */
if (parent_query_len > 0)
{
char *qry_buff;
dsa_area *query_dsa_area = get_dsa_area_for_query_text();
/* Use dsa_allocate_extended with DSA_ALLOC_NO_OOM flag, as we don't want to get an
* error if memory allocation fails.*/
dsa_pointer qry = dsa_allocate_extended(query_dsa_area, parent_query_len+1, DSA_ALLOC_NO_OOM | DSA_ALLOC_ZERO);
if (DsaPointerIsValid(qry))
{
qry_buff = dsa_get_address(query_dsa_area, qry);
memcpy(qry_buff, nested_query_txts[exec_nested_level - 1], parent_query_len);
qry_buff[parent_query_len] = 0;
/* store the dsa pointer for parent query text */
e->counters.info.parent_query = qry;
}
}
@@ -1633,6 +1637,7 @@ pgss_store(uint64 queryid,
pfree(norm_query);
return;
}
/* Get the memory address from DSA pointer and copy the query text in local variable */
query_buff = dsa_get_address(query_dsa_area, dsa_query_pointer);
memcpy(query_buff, norm_query ? norm_query : query, query_len);
/* OK to create a new hashtable entry */