diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index efd1d4ca95c6..21ee41b92e8a 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -195,6 +195,7 @@ int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
 			   u64 flags);
 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
 			    u64 flags);
+int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
 
 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
  * forced to use 'long' read/writes to try to atomically copy long counters.
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index f0a02c344358..499d9e933f8e 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -10,9 +10,10 @@
 #include <linux/vmalloc.h>
 #include <linux/stacktrace.h>
 #include <linux/perf_event.h>
+#include "percpu_freelist.h"
 
 struct stack_map_bucket {
-	struct rcu_head rcu;
+	struct pcpu_freelist_node fnode;
 	u32 hash;
 	u32 nr;
 	u64 ip[];
@@ -20,10 +21,34 @@ struct stack_map_bucket {
 
 struct bpf_stack_map {
 	struct bpf_map map;
+	void *elems;
+	struct pcpu_freelist freelist;
 	u32 n_buckets;
-	struct stack_map_bucket __rcu *buckets[];
+	struct stack_map_bucket *buckets[];
 };
 
+static int prealloc_elems_and_freelist(struct bpf_stack_map *smap)
+{
+	u32 elem_size = sizeof(struct stack_map_bucket) + smap->map.value_size;
+	int err;
+
+	smap->elems = vzalloc(elem_size * smap->map.max_entries);
+	if (!smap->elems)
+		return -ENOMEM;
+
+	err = pcpu_freelist_init(&smap->freelist);
+	if (err)
+		goto free_elems;
+
+	pcpu_freelist_populate(&smap->freelist, smap->elems, elem_size,
+			       smap->map.max_entries);
+	return 0;
+
+free_elems:
+	vfree(smap->elems);
+	return err;
+}
+
 /* Called from syscall */
 static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
 {
@@ -70,12 +95,22 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
 	smap->n_buckets = n_buckets;
 	smap->map.pages = round_up(cost, PAGE_SIZE) >> PAGE_SHIFT;
 
+	err = bpf_map_precharge_memlock(smap->map.pages);
+	if (err)
+		goto free_smap;
+
 	err = get_callchain_buffers();
 	if (err)
 		goto free_smap;
 
+	err = prealloc_elems_and_freelist(smap);
+	if (err)
+		goto put_buffers;
+
 	return &smap->map;
 
+put_buffers:
+	put_callchain_buffers();
 free_smap:
 	kvfree(smap);
 	return ERR_PTR(err);
@@ -121,7 +156,7 @@ static u64 bpf_get_stackid(u64 r1, u64 r2, u64 flags, u64 r4, u64 r5)
 	ips = trace->ip + skip + init_nr;
 	hash = jhash2((u32 *)ips, trace_len / sizeof(u32), 0);
 	id = hash & (smap->n_buckets - 1);
-	bucket = rcu_dereference(smap->buckets[id]);
+	bucket = READ_ONCE(smap->buckets[id]);
 
 	if (bucket && bucket->hash == hash) {
 		if (flags & BPF_F_FAST_STACK_CMP)
@@ -135,19 +170,18 @@ static u64 bpf_get_stackid(u64 r1, u64 r2, u64 flags, u64 r4, u64 r5)
 	if (bucket && !(flags & BPF_F_REUSE_STACKID))
 		return -EEXIST;
 
-	new_bucket = kmalloc(sizeof(struct stack_map_bucket) + map->value_size,
-			     GFP_ATOMIC | __GFP_NOWARN);
+	new_bucket = (struct stack_map_bucket *)
+		pcpu_freelist_pop(&smap->freelist);
 	if (unlikely(!new_bucket))
 		return -ENOMEM;
 
 	memcpy(new_bucket->ip, ips, trace_len);
-	memset(new_bucket->ip + trace_len / 8, 0, map->value_size - trace_len);
 	new_bucket->hash = hash;
 	new_bucket->nr = trace_nr;
 
 	old_bucket = xchg(&smap->buckets[id], new_bucket);
 	if (old_bucket)
-		kfree_rcu(old_bucket, rcu);
+		pcpu_freelist_push(&smap->freelist, &old_bucket->fnode);
 	return id;
 }
 
@@ -160,17 +194,34 @@ const struct bpf_func_proto bpf_get_stackid_proto = {
 	.arg3_type	= ARG_ANYTHING,
 };
 
-/* Called from syscall or from eBPF program */
+/* Called from eBPF program */
 static void *stack_map_lookup_elem(struct bpf_map *map, void *key)
+{
+	return NULL;
+}
+
+/* Called from syscall */
+int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
 {
 	struct bpf_stack_map *smap = container_of(map, struct bpf_stack_map, map);
-	struct stack_map_bucket *bucket;
-	u32 id = *(u32 *)key;
+	struct stack_map_bucket *bucket, *old_bucket;
+	u32 id = *(u32 *)key, trace_len;
 
 	if (unlikely(id >= smap->n_buckets))
-		return NULL;
-	bucket = rcu_dereference(smap->buckets[id]);
-	return bucket ? bucket->ip : NULL;
+		return -ENOENT;
+
+	bucket = xchg(&smap->buckets[id], NULL);
+	if (!bucket)
+		return -ENOENT;
+
+	trace_len = bucket->nr * sizeof(u64);
+	memcpy(value, bucket->ip, trace_len);
+	memset(value + trace_len, 0, map->value_size - trace_len);
+
+	old_bucket = xchg(&smap->buckets[id], bucket);
+	if (old_bucket)
+		pcpu_freelist_push(&smap->freelist, &old_bucket->fnode);
+	return 0;
 }
 
 static int stack_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
@@ -196,7 +247,7 @@ static int stack_map_delete_elem(struct bpf_map *map, void *key)
 
 	old_bucket = xchg(&smap->buckets[id], NULL);
 	if (old_bucket) {
-		kfree_rcu(old_bucket, rcu);
+		pcpu_freelist_push(&smap->freelist, &old_bucket->fnode);
 		return 0;
 	} else {
 		return -ENOENT;
@@ -207,13 +258,12 @@ static int stack_map_delete_elem(struct bpf_map *map, void *key)
 static void stack_map_free(struct bpf_map *map)
 {
 	struct bpf_stack_map *smap = container_of(map, struct bpf_stack_map, map);
-	int i;
 
+	/* wait for bpf programs to complete before freeing stack map */
 	synchronize_rcu();
 
-	for (i = 0; i < smap->n_buckets; i++)
-		if (smap->buckets[i])
-			kfree_rcu(smap->buckets[i], rcu);
+	vfree(smap->elems);
+	pcpu_freelist_destroy(&smap->freelist);
 	kvfree(smap);
 	put_callchain_buffers();
 }
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index cbd94b2144ff..2978d0d08869 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -290,6 +290,8 @@ static int map_lookup_elem(union bpf_attr *attr)
 		err = bpf_percpu_hash_copy(map, key, value);
 	} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
 		err = bpf_percpu_array_copy(map, key, value);
+	} else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
+		err = bpf_stackmap_copy(map, key, value);
 	} else {
 		rcu_read_lock();
 		ptr = map->ops->map_lookup_elem(map, key);