Correctly update LFC used_pages in case of LFC resize (#10128)

## Problem LFC used_pages statistic is not updated in case of LFC resize (shrinking `neon.file_cache_size_limit`) ## Summary of changes Update `lfc_ctl->used_pages` in `lfc_change_limit_hook` Co-authored-by: Konstantin Knizhnik <[email protected]>
neondatabase · Dec 13, 2024 · eeabecd · eeabecd · github-actions · Dec 13, 2024
1 parent fcff752
commit eeabecd
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/pgxn/neon/file_cache.c b/pgxn/neon/file_cache.c
@@ -365,6 +365,10 @@ lfc_change_limit_hook(int newval, void *extra)
 			neon_log(LOG, "Failed to punch hole in file: %m");
 #endif
 		/* We remove the old entry, and re-enter a hole to the hash table */
+		for (int i = 0; i < BLOCKS_PER_CHUNK; i++)
+		{
+			lfc_ctl->used_pages -= (victim->bitmap[i >> 5] >> (i & 31)) & 1;
+		}
 		hash_search_with_hash_value(lfc_hash, &victim->key, victim->hash, HASH_REMOVE, NULL);
 
 		memset(&holetag, 0, sizeof(holetag));