X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=rculfhash.c;h=359de13c82cb427a691fae8645da3adf4c5f1b08;hb=c941bb9efd0c5b865988d46605e82c9b08c544d8;hp=7e959fb4cd8228b161cbb7b4516ff36c4224270b;hpb=7ed7682ffb933c7376830bb73b7f5701e566a559;p=urcu.git

diff --git a/rculfhash.c b/rculfhash.c
index 7e959fb..359de13 100644
--- a/rculfhash.c
+++ b/rculfhash.c
@@ -246,7 +246,7 @@ struct cds_lfht {
 	void (*cds_lfht_rcu_register_thread)(void);
 	void (*cds_lfht_rcu_unregister_thread)(void);
 	pthread_attr_t *resize_attr;	/* Resize threads attributes */
-	unsigned long count;		/* global approximate item count */
+	long count;			/* global approximate item count */
 	struct ht_items_count *percpu_count;	/* per-cpu item count */
 };
 
@@ -556,7 +556,7 @@ void ht_count_add(struct cds_lfht *ht, unsigned long size)
 		return;
 	percpu_count = uatomic_add_return(&ht->percpu_count[cpu].add, 1);
 	if (unlikely(!(percpu_count & ((1UL << COUNT_COMMIT_ORDER) - 1)))) {
-		unsigned long count;
+		long count;
 
 		dbg_printf("add percpu %lu\n", percpu_count);
 		count = uatomic_add_return(&ht->count,
@@ -565,7 +565,7 @@ void ht_count_add(struct cds_lfht *ht, unsigned long size)
 		if (!(count & (count - 1))) {
 			if ((count >> CHAIN_LEN_RESIZE_THRESHOLD) < size)
 				return;
-			dbg_printf("add set global %lu\n", count);
+			dbg_printf("add set global %ld\n", count);
 			cds_lfht_resize_lazy_count(ht, size,
 				count >> (CHAIN_LEN_TARGET - 1));
 		}
@@ -585,7 +585,7 @@ void ht_count_del(struct cds_lfht *ht, unsigned long size)
 		return;
 	percpu_count = uatomic_add_return(&ht->percpu_count[cpu].del, 1);
 	if (unlikely(!(percpu_count & ((1UL << COUNT_COMMIT_ORDER) - 1)))) {
-		unsigned long count;
+		long count;
 
 		dbg_printf("del percpu %lu\n", percpu_count);
 		count = uatomic_add_return(&ht->count,
@@ -594,7 +594,13 @@ void ht_count_del(struct cds_lfht *ht, unsigned long size)
 		if (!(count & (count - 1))) {
 			if ((count >> CHAIN_LEN_RESIZE_THRESHOLD) >= size)
 				return;
-			dbg_printf("del set global %lu\n", count);
+			dbg_printf("del set global %ld\n", count);
+			/*
+			 * Don't shrink table if the number of nodes is below a
+			 * certain threshold.
+			 */
+			if (count < (1UL << COUNT_COMMIT_ORDER) * (nr_cpus_mask + 1))
+				return;
 			cds_lfht_resize_lazy_count(ht, size,
 				count >> (CHAIN_LEN_TARGET - 1));
 		}