This patch has some unit tests and a test_lru_dist.
The test_lru_dist reads in the numeric keys from a file.
The files used here are generated by a modified fio-genzipf tool
originated from the fio test suit. The sample data file can be
found here: https://github.com/iamkafai/bpf-lru
The zipf.* data files have 100k numeric keys and the key is also
ranged from 1 to 100k.
The test_lru_dist outputs the number of unique keys (nr_unique).
F.e. The following means, 61239 of them is unique out of 100k keys.
nr_misses means it cannot be found in the LRU map, so nr_misses
must be >= nr_unique.
[root@arch-vm1 ~]# ./test_lru_dist zipf.100k.a0_01.out 40000
task:0 do_test_lru_dist:......
task:0 BPF LRU: nr_unique:61239(/100000) nr_misses:67054(/100000)
task:0 Perfect LRU: nr_unique:61239(/100000 nr_misses:66993(/100000)
[root@arch-vm1 ~]# ./test_lru_dist zipf.100k.a1_01.out 4000
task:0 BPF LRU: nr_unique:23093(/100000) nr_misses:31603(/100000)
task:0 Perfect LRU: nr_unique:23093(/100000 nr_misses:34328(/100000)
test_lru_dist also simulates a perfect LRU map as a comparison.
Signed-off-by: Martin KaFai Lau <ka...@fb.com>
---
samples/bpf/Makefile | 4 +-
samples/bpf/map_perf_test_kern.c | 20 ++
samples/bpf/map_perf_test_user.c | 17 +
samples/bpf/test_lru_dist.c | 322 ++++++++++++++++++
samples/bpf/test_lru_map.c | 690 +++++++++++++++++++++++++++++++++++++++
5 files changed, 1052 insertions(+), 1 deletion(-)
create mode 100644 samples/bpf/test_lru_dist.c
create mode 100644 samples/bpf/test_lru_map.c
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 12b7304..55052af 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -2,7 +2,7 @@
obj- := dummy.o
# List of programs to build
-hostprogs-y := test_verifier test_maps
+hostprogs-y := test_verifier test_maps test_lru_map test_lru_dist
hostprogs-y += sock_example
hostprogs-y += fds_example
hostprogs-y += sockex1
@@ -30,6 +30,8 @@ hostprogs-y += sampleip
test_verifier-objs := test_verifier.o libbpf.o
test_maps-objs := test_maps.o libbpf.o
+test_lru_map-objs := test_lru_map.o libbpf.o
+test_lru_dist-objs := test_lru_dist.o libbpf.o
sock_example-objs := sock_example.o libbpf.o
fds_example-objs := bpf_load.o libbpf.o fds_example.o
sockex1-objs := bpf_load.o libbpf.o sockex1_user.o
diff --git a/samples/bpf/map_perf_test_kern.c b/samples/bpf/map_perf_test_kern.c
index 311538e..abb11af 100644
--- a/samples/bpf/map_perf_test_kern.c
+++ b/samples/bpf/map_perf_test_kern.c
@@ -19,6 +19,13 @@ struct bpf_map_def SEC("maps") hash_map = {
.max_entries = MAX_ENTRIES,
};
+struct bpf_map_def SEC("maps") lru_hash_map = {
+ .type = BPF_MAP_TYPE_LRU_HASH,
+ .key_size = sizeof(u32),
+ .value_size = sizeof(long),
+ .max_entries = 10000,
+};
+
struct bpf_map_def SEC("maps") percpu_hash_map = {
.type = BPF_MAP_TYPE_PERCPU_HASH,
.key_size = sizeof(u32),
@@ -53,6 +60,7 @@ int stress_hmap(struct pt_regs *ctx)
value = bpf_map_lookup_elem(&hash_map, &key);
if (value)
bpf_map_delete_elem(&hash_map, &key);
+
return 0;
}
@@ -96,5 +104,17 @@ int stress_percpu_hmap_alloc(struct pt_regs *ctx)
bpf_map_delete_elem(&percpu_hash_map_alloc, &key);
return 0;
}
+
+SEC("kprobe/sys_getpid")
+int stress_lru_hmap_alloc(struct pt_regs *ctx)
+{
+ u32 key = bpf_get_prandom_u32();
+ long val = 1;
+
+ bpf_map_update_elem(&lru_hash_map, &key, &val, BPF_ANY);
+
+ return 0;
+}
+
char _license[] SEC("license") = "GPL";
u32 _version SEC("version") = LINUX_VERSION_CODE;
diff --git a/samples/bpf/map_perf_test_user.c b/samples/bpf/map_perf_test_user.c
index 3147377..db7fa74 100644
--- a/samples/bpf/map_perf_test_user.c
+++ b/samples/bpf/map_perf_test_user.c
@@ -35,6 +35,7 @@ static __u64 time_get_ns(void)
#define PERCPU_HASH_PREALLOC (1 << 1)
#define HASH_KMALLOC (1 << 2)
#define PERCPU_HASH_KMALLOC (1 << 3)
+#define LRU_HASH_PREALLOC (1 << 4)
static int test_flags = ~0;
@@ -50,6 +51,19 @@ static void test_hash_prealloc(int cpu)
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
}
+static void test_lru_hash_prealloc(int cpu)
+{
+ __u64 start_time;
+ int i;
+
+ start_time = time_get_ns();
+ for (i = 0; i < MAX_CNT; i++)
+ syscall(__NR_getpid);
+ printf("%d:lru_hash_map_perf pre-alloc %lld events per sec\n",
+ cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
+}
+
+
static void test_percpu_hash_prealloc(int cpu)
{
__u64 start_time;
@@ -105,6 +119,9 @@ static void loop(int cpu)
if (test_flags & PERCPU_HASH_KMALLOC)
test_percpu_hash_kmalloc(cpu);
+
+ if (test_flags & LRU_HASH_PREALLOC)
+ test_lru_hash_prealloc(cpu);
}
static void run_perf_test(int tasks)
diff --git a/samples/bpf/test_lru_dist.c b/samples/bpf/test_lru_dist.c
new file mode 100644
index 0000000..376e14c
--- /dev/null
+++ b/samples/bpf/test_lru_dist.c
@@ -0,0 +1,322 @@
+/*
+ * Copyright (c) 2016 Facebook
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#define _GNU_SOURCE
+#include <linux/types.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <linux/bpf.h>
+#include <errno.h>
+#include <string.h>
+#include <assert.h>
+#include <sched.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <time.h>
+#include "libbpf.h"
+
+#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
+
+#define container_of(ptr, type, member) ({ \
+ const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+ (type *)( (char *)__mptr - offsetof(type,member) );})
+
+struct list_head {
+ struct list_head *next, *prev;
+};
+
+static inline void INIT_LIST_HEAD(struct list_head *list)
+{
+ list->next = list;
+ list->prev = list;
+}
+
+static inline int list_empty(const struct list_head *head)
+{
+ return head->next == head;
+}
+
+static inline void __list_add(struct list_head *new,
+ struct list_head *prev,
+ struct list_head *next)
+{
+ next->prev = new;
+ new->next = next;
+ new->prev = prev;
+ prev->next = new;
+}
+
+static inline void list_add(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head, head->next);
+}
+
+static inline void __list_del(struct list_head *prev, struct list_head *next)
+{
+ next->prev = prev;
+ prev->next = next;
+}
+
+static inline void __list_del_entry(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+}
+
+static inline void list_move(struct list_head *list, struct list_head *head)
+{
+ __list_del_entry(list);
+ list_add(list, head);
+}
+
+#define list_entry(ptr, type, member) \
+ container_of(ptr, type, member)
+
+
+#define list_last_entry(ptr, type, member) \
+ list_entry((ptr)->prev, type, member)
+
+struct pfect_lru_node {
+ struct list_head list;
+ unsigned long long key;
+};
+
+struct pfect_lru {
+ struct list_head list;
+ struct pfect_lru_node *free_nodes;
+ unsigned int cur_size;
+ unsigned int lru_size;
+ unsigned int nr_unique;
+ unsigned int nr_misses;
+ unsigned int total;
+ int map_fd;
+};
+
+static void pfect_lru_init(struct pfect_lru *lru, unsigned int lru_size,
+ unsigned int nr_possible_elems)
+{
+ lru->map_fd = bpf_create_map(BPF_MAP_TYPE_HASH,
+ sizeof(unsigned long long),
+ sizeof(struct pfect_lru_node *),
+ nr_possible_elems, 0);
+ assert(lru->map_fd != -1);
+
+ lru->free_nodes = malloc(lru_size * sizeof(struct pfect_lru_node));
+ assert(lru->free_nodes);
+
+ INIT_LIST_HEAD(&lru->list);
+ lru->cur_size = 0;
+ lru->lru_size = lru_size;
+ lru->nr_unique = lru->nr_misses = lru->total = 0;
+}
+
+static void pfect_lru_destroy(struct pfect_lru *lru)
+{
+ close(lru->map_fd);
+ free(lru->free_nodes);
+}
+
+static int pfect_lru_lookup_or_insert(struct pfect_lru *lru,
+ unsigned long long key)
+{
+ struct pfect_lru_node *node = NULL;
+ int seen = 0;
+
+ lru->total++;
+ if (!bpf_lookup_elem(lru->map_fd, &key, &node)) {
+ if (node) {
+ list_move(&node->list, &lru->list);
+ return 1;
+ }
+ seen = 1;
+ }
+
+ if (lru->cur_size < lru->lru_size) {
+ node = &lru->free_nodes[lru->cur_size++];
+ INIT_LIST_HEAD(&node->list);
+ } else {
+ struct pfect_lru_node *null_node = NULL;
+
+ node = list_last_entry(&lru->list,
+ struct pfect_lru_node,
+ list);
+ bpf_update_elem(lru->map_fd, &node->key, &null_node, BPF_EXIST);
+ }
+
+ node->key = key;
+ list_move(&node->list, &lru->list);
+
+ lru->nr_misses++;
+ if (seen) {
+ assert(!bpf_update_elem(lru->map_fd, &key, &node, BPF_EXIST));
+ } else {
+ lru->nr_unique++;
+ assert(!bpf_update_elem(lru->map_fd, &key, &node, BPF_NOEXIST));
+ }
+
+ return seen;
+}
+
+static unsigned int read_keys(const char *dist_file,
+ unsigned long long **keys)
+{
+ struct stat fst;
+ unsigned long long *retkeys;
+ unsigned int counts = 0;
+ int dist_fd;
+ char *b, *l;
+ int i;
+
+ dist_fd = open(dist_file, 0);
+ assert(dist_fd != -1);
+
+ assert(fstat(dist_fd, &fst) == 0);
+ b = malloc(fst.st_size);
+ assert(b);
+
+ assert(read(dist_fd, b, fst.st_size) == fst.st_size);
+ close(dist_fd);
+ for (i = 0; i < fst.st_size; i++) {
+ if (b[i] == '\n')
+ counts++;
+ }
+ counts++; /* in case the last line has no \n */
+
+ retkeys = malloc(counts * sizeof(unsigned long long));
+ assert(retkeys);
+
+ counts = 0;
+ for (l = strtok(b, "\n"); l; l = strtok(NULL, "\n"))
+ retkeys[counts++] = strtoull(l, NULL, 10);
+ free(b);
+
+ *keys = retkeys;
+
+ return counts;
+}
+
+static void do_test_lru_dist(int lru_map_fd, int task,
+ const unsigned long long *keys,
+ unsigned int key_counts, unsigned int lru_size)
+{
+ unsigned int nr_misses = 0;
+ struct pfect_lru pfect_lru;
+ unsigned long long key_offset = task * key_counts;
+ unsigned long long key, value = 1234;
+ unsigned int i;
+
+ printf("task:%d %s:......\n", task, __func__);
+
+ pfect_lru_init(&pfect_lru, lru_size, key_counts);
+
+ for (i = 0; i < key_counts; i++) {
+ key = keys[i] + key_offset;
+
+ pfect_lru_lookup_or_insert(&pfect_lru, key);
+
+ if (!bpf_lookup_elem(lru_map_fd, &key, &value))
+ continue;
+
+ if (bpf_update_elem(lru_map_fd, &key, &value, BPF_NOEXIST)) {
+ printf("bpf_update_elem(lru_map_fd, %llu): errno:%d\n",
+ key, errno);
+ assert(0);
+ }
+
+ nr_misses++;
+ }
+
+ printf(" task:%d BPF LRU: nr_unique:%u(/%u) nr_misses:%u(/%u)\n",
+ task, pfect_lru.nr_unique, key_counts, nr_misses, key_counts);
+ printf(" task:%d Perfect LRU: nr_unique:%u(/%u nr_misses:%u(/%u)\n",
+ task, pfect_lru.nr_unique, pfect_lru.total,
+ pfect_lru.nr_misses, pfect_lru.total);
+
+ pfect_lru_destroy(&pfect_lru);
+}
+
+static void test_lru_dist(int map_type, const unsigned long long *keys,
+ unsigned int key_counts, unsigned int lru_size)
+{
+ cpu_set_t cpuset;
+ int lru_map_fd;
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ assert(!sched_setaffinity(0, sizeof(cpuset), &cpuset));
+
+ lru_map_fd = bpf_create_map(map_type, sizeof(unsigned long long),
+ sizeof(unsigned long long),
+ lru_size, 0);
+ assert(lru_map_fd != -1);
+ do_test_lru_dist(lru_map_fd, 0, keys, key_counts, lru_size);
+ close(lru_map_fd);
+}
+
+static void test_parallel_lru_dist(int map_type, int nr_tasks,
+ const unsigned long long *keys,
+ unsigned int key_counts,
+ unsigned int lru_size)
+{
+ cpu_set_t cpuset;
+ pid_t pid[nr_tasks];
+ int lru_map_fd;
+ int i;
+
+
+ lru_map_fd = bpf_create_map(map_type, sizeof(unsigned long long),
+ sizeof(unsigned long long),
+ nr_tasks * lru_size, 0);
+ assert(lru_map_fd != -1);
+
+ for (i = 0; i < nr_tasks; i++) {
+ pid[i] = fork();
+ if (pid[i] == 0) {
+ CPU_ZERO(&cpuset);
+ CPU_SET(i, &cpuset);
+ assert(!sched_setaffinity(0, sizeof(cpuset), &cpuset));
+ do_test_lru_dist(lru_map_fd, i, keys, key_counts,
+ lru_size);
+ exit(0);
+ } else if (pid[i] == -1) {
+ printf("couldn't spawn #%d process\n", i);
+ exit(1);
+ }
+ }
+ for (i = 0; i < nr_tasks; i++) {
+ int status;
+
+ assert(waitpid(pid[i], &status, 0) == pid[i]);
+ assert(status == 0);
+ }
+
+ close(lru_map_fd);
+}
+
+int main(int argc, char **argv)
+{
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ const char *dist_file = argv[1];
+ int lru_size = atoi(argv[2]);
+ unsigned long long *keys = NULL;
+ unsigned int counts;
+
+ setbuf(stdout, NULL);
+
+ assert(!setrlimit(RLIMIT_MEMLOCK, &r));
+
+ counts = read_keys(dist_file, &keys);
+ test_lru_dist(BPF_MAP_TYPE_LRU_HASH, keys, counts, lru_size);
+ if (argc > 3)
+ test_parallel_lru_dist(BPF_MAP_TYPE_LRU_HASH, atoi(argv[3]),
+ keys, counts, lru_size);
+
+ free(keys);
+
+ return 0;
+}
diff --git a/samples/bpf/test_lru_map.c b/samples/bpf/test_lru_map.c
new file mode 100644
index 0000000..82cfffc
--- /dev/null
+++ b/samples/bpf/test_lru_map.c
@@ -0,0 +1,690 @@
+/*
+ * Copyright (c) 2016 Facebook
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <unistd.h>
+#include <linux/bpf.h>
+#include <errno.h>
+#include <string.h>
+#include <assert.h>
+#include <sched.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <time.h>
+#include "libbpf.h"
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#define LOCAL_FREE_TARGET (128)
+
+static long nr_cpus;
+
+static int create_map(int map_type, unsigned int size)
+{
+ int map_fd;
+
+ map_fd = bpf_create_map(map_type, sizeof(unsigned long long),
+ sizeof(unsigned long long), size, 0);
+
+ if (map_fd == -1)
+ perror("bpf_create_map");
+
+ return map_fd;
+}
+
+static int map_subset(int map0, int map1)
+{
+ unsigned long long next_key = 0;
+ unsigned long long value0[nr_cpus], value1[nr_cpus];
+ int ret;
+
+ while (!bpf_get_next_key(map1, &next_key, &next_key)) {
+ assert(!bpf_lookup_elem(map1, &next_key, value1));
+ ret = bpf_lookup_elem(map0, &next_key, value0);
+ if (ret) {
+ printf("key:%llu not found from map. %s(%d)\n",
+ next_key, strerror(errno), errno);
+ return 0;
+ }
+ if (value0[0] != value1[0]) {
+ printf("key:%llu value0:%llu != value1:%llu\n",
+ next_key, value0[0], value1[0]);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int map_equal(int lru_map, int expected)
+{
+ return map_subset(lru_map, expected) && map_subset(expected, lru_map);
+}
+
+/* Size of the LRU amp is 2
+ * Add key=1 (+1 key)
+ * Add key=2 (+1 key)
+ * Lookup Key=1
+ * Add Key=3
+ * => Key=2 will be removed by LRU
+ * Iterate map. Only found key=1 and key=3
+ */
+static void test_lru_sanity0(int map_type)
+{
+ unsigned long long key, value[nr_cpus];
+ cpu_set_t cpuset;
+ int map_fd, expected_map_fd;
+
+ printf("%s (map_type:%d): ", __func__, map_type);
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ assert(!sched_setaffinity(0, sizeof(cpuset), &cpuset));
+
+ map_fd = create_map(map_type, 2);
+ assert(map_fd != -1);
+ expected_map_fd = create_map(BPF_MAP_TYPE_HASH, 2);
+ assert(expected_map_fd != -1);
+
+ value[0] = 1234;
+
+ /* insert key=1 element */
+
+ key = 1;
+ assert(!bpf_update_elem(map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_update_elem(expected_map_fd, &key, value, BPF_NOEXIST));
+
+ /* BPF_NOEXIST means: add new element if it doesn't exist */
+ assert(bpf_update_elem(map_fd, &key, value, BPF_NOEXIST) == -1 &&
+ /* key=1 already exists */
+ errno == EEXIST);
+
+ assert(bpf_update_elem(map_fd, &key, value, -1) == -1 &&
+ errno == EINVAL);
+
+ /* insert key=2 element */
+
+ /* check that key=2 is not found */
+ key = 2;
+ assert(bpf_lookup_elem(map_fd, &key, value) == -1 && errno == ENOENT);
+
+ /* BPF_EXIST means: update existing element */
+ assert(bpf_update_elem(map_fd, &key, value, BPF_EXIST) == -1 &&
+ /* key=2 is not there */
+ errno == ENOENT);
+
+ assert(!bpf_update_elem(map_fd, &key, value, BPF_NOEXIST));
+
+ /* insert key=3 element */
+
+ /* check that key=3 is not found */
+ key = 3;
+ assert(bpf_lookup_elem(map_fd, &key, value) == -1 && errno == ENOENT);
+
+ /* check that key=1 can be found and mark the ref bit to
+ * stop LRU from removing key=1
+ */
+ key = 1;
+ assert(!bpf_lookup_elem(map_fd, &key, value));
+ assert(value[0] == 1234);
+
+ key = 3;
+ assert(!bpf_update_elem(map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_update_elem(expected_map_fd, &key, value, BPF_NOEXIST));
+
+ /* key=2 has been removed from the LRU */
+ key = 2;
+ assert(bpf_lookup_elem(map_fd, &key, value) == -1);
+
+ assert(map_equal(map_fd, expected_map_fd));
+
+ close(map_fd);
+
+ printf("Pass\n");
+}
+
+/* Size of the LRU map is 1.5*LOCAL_FREE_TARGET
+ * Insert 1 to LOCAL_FREE_TARGET (+LOCAL_FREE_TARGET keys)
+ * Lookup 1 to LOCAL_FREE_TARGET/2
+ * Insert 1+LOCAL_FREE_TARGET to 2*LOCAL_FREE_TARGET (+LOCAL_FREE_TARGET keys)
+ * => 1+LOCAL_FREE_TARGET/2 to LOCALFREE_TARGET will be removed by LRU
+ */
+static void test_lru_sanity1(int map_type)
+{
+ unsigned long long key, end_key, value[nr_cpus];
+ unsigned int map_size;
+ int lru_map_fd, expected_map_fd;
+ unsigned int batch_size;
+ cpu_set_t cpuset;
+
+ printf("%s (map_type:%d): ", __func__, map_type);
+
+ batch_size = LOCAL_FREE_TARGET / 2;
+ assert(batch_size * 2 == LOCAL_FREE_TARGET);
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ assert(sched_setaffinity(0, sizeof(cpuset), &cpuset) == 0);
+
+ map_size = LOCAL_FREE_TARGET + batch_size;
+ lru_map_fd = create_map(map_type, map_size);
+ assert(lru_map_fd != -1);
+ expected_map_fd = create_map(BPF_MAP_TYPE_HASH, map_size);
+ assert(expected_map_fd != -1);
+
+ value[0] = 1234;
+
+ /* Insert 1 to LOCAL_FREE_TARGET (+LOCAL_FREE_TARGET keys) */
+ end_key = 1 + LOCAL_FREE_TARGET;
+ for (key = 1; key < end_key; key++)
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+
+ /* Lookup 1 to LOCAL_FREE_TARGET/2 */
+ end_key = 1 + batch_size;
+ for (key = 1; key < end_key; key++) {
+ assert(!bpf_lookup_elem(lru_map_fd, &key, value));
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ /* Insert 1+LOCAL_FREE_TARGET to 2*LOCAL_FREE_TARGET
+ * => 1+LOCAL_FREE_TARGET/2 to LOCALFREE_TARGET will be
+ * removed by LRU
+ */
+ key = 1 + LOCAL_FREE_TARGET;
+ end_key = key + LOCAL_FREE_TARGET;
+ for (; key < end_key; key++) {
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ assert(map_equal(lru_map_fd, expected_map_fd));
+
+ close(expected_map_fd);
+ close(lru_map_fd);
+
+ printf("Pass\n");
+}
+
+/* Size of the LRU map 1.5 * LOCAL_FREE_TARGET
+ * Insert 1 to LOCAL_FREE_TARGET (+LOCAL_FREE_TARGET keys)
+ * Update 1 to LOCAL_FREE_TARGET/2
+ * => The original 1 to LOCAL_FREE_TARGET/2 will be removed due to
+ * the LRU shrink process
+ * Re-insert 1 to LOCAL_FREE_TARGET/2 again and do a lookup immeidately
+ * Insert 1+LOCAL_FREE_TARGET to LOCAL_FREE_TARGET*3/2
+ * Insert 1+LOCAL_FREE_TARGET*3/2 to LOCAL_FREE_TARGET*5/2
+ * => Key 1+LOCAL_FREE_TARGET to LOCAL_FREE_TARGET*3/2
+ * will be removed from LRU because it has never
+ * been lookup and ref bit is not set
+ */
+static void test_lru_sanity2(int map_type)
+{
+ unsigned long long key, value[nr_cpus];
+ unsigned long long end_key;
+ int lru_map_fd, expected_map_fd;
+ unsigned int batch_size;
+ unsigned int map_size;
+ cpu_set_t cpuset;
+
+ printf("%s (map_type:%d): ", __func__, map_type);
+
+ batch_size = LOCAL_FREE_TARGET / 2;
+ assert(batch_size * 2 == LOCAL_FREE_TARGET);
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ assert(sched_setaffinity(0, sizeof(cpuset), &cpuset) == 0);
+
+ map_size = LOCAL_FREE_TARGET + batch_size;
+ lru_map_fd = create_map(map_type, map_size);
+ assert(lru_map_fd != -1);
+ expected_map_fd = create_map(BPF_MAP_TYPE_HASH, map_size);
+ assert(expected_map_fd != -1);
+
+ value[0] = 1234;
+
+ /* Insert 1 to LOCAL_FREE_TARGET (+LOCAL_FREE_TARGET keys) */
+ end_key = 1 + LOCAL_FREE_TARGET;
+ for (key = 1; key < end_key; key++)
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+
+ /* Any bpf_update_elem will require to acquire a new node
+ * from LRU first.
+ *
+ * The local list is running out of free nodes.
+ * It gets from the global LRU list which tries to
+ * shrink the inactive list to get LOCAL_FREE_TARGET
+ * number of free nodes.
+ *
+ * Hence, the oldest key 1 to LOCAL_FREE_TARGET/2
+ * are removed from the LRU list.
+ */
+ key = 1;
+ if (map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_delete_elem(lru_map_fd, &key));
+ } else
+ assert(bpf_update_elem(lru_map_fd, &key, value, BPF_EXIST));
+
+
+ /* Re-insert 1 to LOCAL_FREE_TARGET/2 again and do a lookup
+ * immeidately.
+ */
+ end_key = 1 + batch_size;
+ value[0] = 4321;
+ for (key = 1; key < end_key; key++) {
+ assert(bpf_lookup_elem(lru_map_fd, &key, value));
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_lookup_elem(lru_map_fd, &key, value));
+ assert(value[0] == 4321);
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ value[0] = 1234;
+
+ /* Insert 1+LOCAL_FREE_TARGET to LOCAL_FREE_TARGET*3/2 */
+ end_key = 1 + LOCAL_FREE_TARGET + batch_size;
+ for (key = 1 + LOCAL_FREE_TARGET; key < end_key; key++)
+ /* These newly added but not referenced keys will be
+ * gone during the next LRU shrink.
+ */
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+
+ /* Insert 1+LOCAL_FREE_TARGET*3/2 to LOCAL_FREE_TARGET*5/2 */
+ end_key = key + LOCAL_FREE_TARGET;
+ for (; key < end_key; key++) {
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ assert(map_equal(lru_map_fd, expected_map_fd));
+
+ close(expected_map_fd);
+ close(lru_map_fd);
+
+ printf("Pass\n");
+}
+
+/* Size of the LRU map is 2*LOCAL_FREE_TARGET
+ * It is to test the active/inactive list rotation
+ * Insert 1 to 2*LOCAL_FREE_TARGET (+2*LOCAL_FREE_TARGET keys)
+ * Lookup key 1 to LOCAL_FREE_TARGET*3/2
+ * Add 1+2*LOCAL_FREE_TARGET to LOCAL_FREE_TARGET*5/2 (+LOCAL_FREE_TARGET/2
keys)
+ * => key 1+LOCAL_FREE_TARGET*3/2 to 2*LOCAL_FREE_TARGET are removed from LRU
+ */
+static void test_lru_sanity3(int map_type)
+{
+ unsigned long long key, end_key, value[nr_cpus];
+ int lru_map_fd, expected_map_fd;
+ unsigned int batch_size;
+ unsigned int map_size;
+ cpu_set_t cpuset;
+
+ printf("%s (map_type:%d): ", __func__, map_type);
+
+ batch_size = LOCAL_FREE_TARGET / 2;
+ assert(batch_size * 2 == LOCAL_FREE_TARGET);
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ assert(sched_setaffinity(0, sizeof(cpuset), &cpuset) == 0);
+
+ map_size = LOCAL_FREE_TARGET * 2;
+ lru_map_fd = create_map(map_type, map_size);
+ assert(lru_map_fd != -1);
+ expected_map_fd = create_map(BPF_MAP_TYPE_HASH, map_size);
+ assert(expected_map_fd != -1);
+
+ value[0] = 1234;
+
+ /* Insert 1 to 2*LOCAL_FREE_TARGET (+2*LOCAL_FREE_TARGET keys) */
+ end_key = 1 + (2 * LOCAL_FREE_TARGET);
+ for (key = 1; key < end_key; key++)
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+
+ /* Lookup key 1 to LOCAL_FREE_TARGET*3/2 */
+ end_key = LOCAL_FREE_TARGET + batch_size;
+ for (key = 1; key < end_key; key++) {
+ assert(!bpf_lookup_elem(lru_map_fd, &key, value));
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ /* Add 1+2*LOCAL_FREE_TARGET to LOCAL_FREE_TARGET*5/2
+ * (+LOCAL_FREE_TARGET/2 keys)
+ */
+ key = 2 * LOCAL_FREE_TARGET + 1;
+ end_key = key + batch_size;
+ for (; key < end_key; key++) {
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ assert(map_equal(lru_map_fd, expected_map_fd));
+
+ close(expected_map_fd);
+ close(lru_map_fd);
+
+ printf("Pass\n");
+}
+
+/* Test deletion */
+static void test_lru_sanity4(int map_type)
+{
+ int lru_map_fd, expected_map_fd;
+ unsigned long long key, value[nr_cpus];
+ unsigned long long end_key;
+ cpu_set_t cpuset;
+
+ printf("%s (map_type:%d): ", __func__, map_type);
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ assert(sched_setaffinity(0, sizeof(cpuset), &cpuset) == 0);
+
+ lru_map_fd = create_map(map_type, 3 * LOCAL_FREE_TARGET);
+ assert(lru_map_fd != -1);
+ expected_map_fd = create_map(BPF_MAP_TYPE_HASH,
+ 3 * LOCAL_FREE_TARGET);
+
+ value[0] = 1234;
+
+ for (key = 1; key <= 2 * LOCAL_FREE_TARGET; key++)
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+
+ key = 1;
+ assert(bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+
+ for (key = 1; key <= LOCAL_FREE_TARGET; key++) {
+ assert(!bpf_lookup_elem(lru_map_fd, &key, value));
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ for (; key <= 2 * LOCAL_FREE_TARGET; key++) {
+ assert(!bpf_delete_elem(lru_map_fd, &key));
+ assert(bpf_delete_elem(lru_map_fd, &key));
+ }
+
+ end_key = key + 2 * LOCAL_FREE_TARGET;
+ for (; key < end_key; key++) {
+ assert(!bpf_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_update_elem(expected_map_fd, &key, value,
+ BPF_NOEXIST));
+ }
+
+ assert(map_equal(lru_map_fd, expected_map_fd));
+
+ close(expected_map_fd);
+ close(lru_map_fd);
+
+ printf("Pass\n");
+}
+
+static void do_test_lru_small0(int cpu, int map_fd)
+{
+ unsigned long long key, value[nr_cpus];
+
+ /* Ensure the last key inserted by previous CPU can be found */
+ key = cpu;
+ assert(!bpf_lookup_elem(map_fd, &key, value));
+
+ value[0] = 1234;
+
+ key = cpu + 1;
+ assert(!bpf_update_elem(map_fd, &key, value, BPF_NOEXIST));
+ assert(!bpf_lookup_elem(map_fd, &key, value));
+
+ /* Cannot find the last key because it was removed by LRU */
+ key = cpu;
+ assert(bpf_lookup_elem(map_fd, &key, value));
+}
+
+static void test_lru_small0(int map_type)
+{
+ unsigned long long key, value[nr_cpus];
+ int map_fd;
+ int i;
+
+ printf("%s (map_type%d): ", __func__, map_type);
+
+ map_fd = create_map(map_type, 1);
+ assert(map_fd != -1);
+
+ value[0] = 1234;
+ key = 0;
+ assert(!bpf_update_elem(map_fd, &key, value, BPF_NOEXIST));
+
+ for (i = 0; i < nr_cpus; i++) {
+ cpu_set_t cpuset;
+ pid_t pid;
+
+ pid = fork();
+ if (pid == 0) {
+ CPU_ZERO(&cpuset);
+ CPU_SET(i, &cpuset);
+ assert(!sched_setaffinity(0, sizeof(cpuset), &cpuset));
+ do_test_lru_small0(i, map_fd);
+ exit(0);
+ } else if (pid == -1) {
+ printf("couldn't spawn #%d process\n", i);
+ exit(1);
+ } else {
+ int status;
+
+ assert(waitpid(pid, &status, 0) == pid);
+ assert(status == 0);
+ }
+ }
+
+ close(map_fd);
+
+ printf("Pass\n");
+}
+
+static void test_lru_loss0(int map_type)
+{
+ unsigned long long key, value[nr_cpus];
+ unsigned int old_unused_losses = 0;
+ unsigned int new_unused_losses = 0;
+ unsigned int used_losses = 0;
+ int map_fd;
+
+ printf("%s (map_type:%d): ", __func__, map_type);
+
+ map_fd = create_map(map_type, 900);
+ assert(map_fd != -1);
+
+ value[0] = 1234;
+
+ for (key = 1; key <= 1000; key++) {
+ int start_key, end_key;
+
+ assert(bpf_update_elem(map_fd, &key, value, BPF_NOEXIST) == 0);
+
+ start_key = 101;
+ end_key = min(key, 900);
+
+ while (start_key <= end_key) {
+ bpf_lookup_elem(map_fd, &start_key, value);
+ start_key++;
+ }
+ }
+
+ for (key = 1; key <= 1000; key++) {
+ if (bpf_lookup_elem(map_fd, &key, value)) {
+ if (key <= 100)
+ old_unused_losses++;
+ else if (key <= 900)
+ used_losses++;
+ else
+ new_unused_losses++;
+ }
+ }
+
+ close(map_fd);
+
+ printf("older-elem-losses:%d(/100) active-elem-losses:%d(/800) "
+ "newer-elem-losses:%d(/100)\n",
+ old_unused_losses, used_losses, new_unused_losses);
+}
+
+static void test_lru_loss1(int map_type)
+{
+ unsigned long long key, value[nr_cpus];
+ int map_fd;
+ unsigned int nr_losses = 0;
+
+ printf("%s (map_type:%d): ", __func__, map_type);
+
+ map_fd = create_map(map_type, 1000);
+ assert(map_fd != -1);
+
+ value[0] = 1234;
+
+ for (key = 1; key <= 1000; key++)
+ assert(!bpf_update_elem(map_fd, &key, value, BPF_NOEXIST));
+
+ for (key = 1; key <= 1000; key++) {
+ if (bpf_lookup_elem(map_fd, &key, value))
+ nr_losses++;
+ }
+
+ close(map_fd);
+
+ printf("nr_losses:%d(/1000)\n", nr_losses);
+}
+
+static void do_test_lru_parallel_loss(int task, void *data)
+{
+ const unsigned int nr_stable_elems = 1000;
+ const unsigned int nr_repeats = 100000;
+
+ int map_fd = *(int *)data;
+ unsigned long long stable_base;
+ unsigned long long key, value[nr_cpus];
+ unsigned long long next_ins_key;
+ unsigned int nr_losses = 0;
+ unsigned int i;
+
+ stable_base = task * nr_repeats * 2 + 1;
+ next_ins_key = stable_base;
+ value[0] = 1234;
+ for (i = 0; i < nr_stable_elems; i++) {
+ assert(bpf_update_elem(map_fd, &next_ins_key, value,
+ BPF_NOEXIST) == 0);
+ next_ins_key++;
+ }
+
+ for (i = 0; i < nr_repeats; i++) {
+ int rn;
+
+ rn = rand();
+
+ if (rn % 10) {
+ key = rn % nr_stable_elems + stable_base;
+ bpf_lookup_elem(map_fd, &key, value);
+ } else {
+ bpf_update_elem(map_fd, &next_ins_key, value,
+ BPF_NOEXIST);
+ next_ins_key++;
+ }
+ }
+
+ key = stable_base;
+ for (i = 0; i < nr_stable_elems; i++) {
+ if (bpf_lookup_elem(map_fd, &key, value))
+ nr_losses++;
+ key++;
+ }
+
+ printf(" task:%d nr_losses:%u\n", task, nr_losses);
+}
+
+static void run_parallel(int tasks, void (*fn)(int i, void *data), void *data)
+{
+ cpu_set_t cpuset;
+ pid_t pid[tasks];
+ int i;
+
+ for (i = 0; i < tasks; i++) {
+ pid[i] = fork();
+ if (pid[i] == 0) {
+ CPU_ZERO(&cpuset);
+ CPU_SET(i, &cpuset);
+ assert(!sched_setaffinity(0, sizeof(cpuset), &cpuset));
+ fn(i, data);
+ exit(0);
+ } else if (pid[i] == -1) {
+ printf("couldn't spawn #%d process\n", i);
+ exit(1);
+ }
+ }
+ for (i = 0; i < tasks; i++) {
+ int status;
+
+ assert(waitpid(pid[i], &status, 0) == pid[i]);
+ assert(status == 0);
+ }
+}
+
+static void test_lru_parallel_loss(int map_type, int nr_tasks)
+{
+ int map_fd;
+
+ printf("%s (map_type:%d):\n", __func__, map_type);
+
+ /* Give 20% more than the active working set */
+ map_fd = create_map(map_type, nr_tasks * (1000 + 200));
+
+ assert(map_fd != -1);
+
+ run_parallel(nr_tasks, do_test_lru_parallel_loss, &map_fd);
+
+ close(map_fd);
+}
+
+int main(int argc, char **argv)
+{
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ int map_types[] = {BPF_MAP_TYPE_LRU_HASH,
+ BPF_MAP_TYPE_LRU_PERCPU_HASH};
+ int i;
+
+ setbuf(stdout, NULL);
+
+ assert(!setrlimit(RLIMIT_MEMLOCK, &r));
+
+ srand(time(NULL));
+
+ nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
+ assert(nr_cpus != -1);
+ printf("nr_cpus:%ld\n\n", nr_cpus);
+
+ for (i = 0; i < sizeof(map_types) / sizeof(*map_types); i++) {
+ test_lru_sanity0(map_types[i]);
+ test_lru_sanity1(map_types[i]);
+ test_lru_sanity2(map_types[i]);
+ test_lru_sanity3(map_types[i]);
+ test_lru_sanity4(map_types[i]);
+
+ test_lru_small0(map_types[i]);
+
+ test_lru_loss0(map_types[i]);
+ test_lru_loss1(map_types[i]);
+ test_lru_parallel_loss(map_types[i], nr_cpus);
+
+ printf("\n");
+ }
+
+
+ return 0;
+}
--
2.5.1
