diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 2f5e6d35b03b..37f755c9a1b7 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -246,6 +246,7 @@ struct zs_pool {
 	struct work_struct free_work;
 #endif
 	spinlock_t lock;
+	atomic_t compaction_in_progress;
 };
 
 struct zspage {
@@ -2100,6 +2101,15 @@ unsigned long zs_compact(struct zs_pool *pool)
 	struct size_class *class;
 	unsigned long pages_freed = 0;
 
+	/*
+	 * Pool compaction is performed under pool->lock so it is basically
+	 * single-threaded. Having more than one thread in __zs_compact()
+	 * will increase pool->lock contention, which will impact other
+	 * zsmalloc operations that need pool->lock.
+	 */
+	if (atomic_xchg(&pool->compaction_in_progress, 1))
+		return 0;
+
 	for (i = ZS_SIZE_CLASSES - 1; i >= 0; i--) {
 		class = pool->size_class[i];
 		if (class->index != i)
@@ -2107,6 +2117,7 @@ unsigned long zs_compact(struct zs_pool *pool)
 		pages_freed += __zs_compact(pool, class);
 	}
 	atomic_long_add(pages_freed, &pool->stats.pages_compacted);
+	atomic_set(&pool->compaction_in_progress, 0);
 
 	return pages_freed;
 }
@@ -2193,6 +2204,7 @@ struct zs_pool *zs_create_pool(const char *name)
 
 	init_deferred_free(pool);
 	spin_lock_init(&pool->lock);
+	atomic_set(&pool->compaction_in_progress, 0);
 
 	pool->name = kstrdup(name, GFP_KERNEL);
 	if (!pool->name)