samples/bpf: add map performance test

performance tests for hash map and per-cpu hash map
with and without pre-allocation

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 155 insertions, 0 deletions

diff --git a/samples/bpf/map_perf_test_user.c b/samples/bpf/map_perf_test_user.c
new file mode 100644
index 000000000000..95af56ec5739
--- /dev/null
+++ b/samples/bpf/map_perf_test_user.c
@@ -0,0 +1,155 @@
+/* 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 <sched.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <asm/unistd.h>
+#include <unistd.h>
+#include <assert.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <linux/bpf.h>
+#include <string.h>
+#include <time.h>
+#include "libbpf.h"
+#include "bpf_load.h"
+
+#define MAX_CNT 1000000
+
+static __u64 time_get_ns(void)
+{
+        struct timespec ts;
+
+        clock_gettime(CLOCK_MONOTONIC, &ts);
+        return ts.tv_sec * 1000000000ull + ts.tv_nsec;
+}
+
+#define HASH_PREALLOC           (1 << 0)
+#define PERCPU_HASH_PREALLOC    (1 << 1)
+#define HASH_KMALLOC            (1 << 2)
+#define PERCPU_HASH_KMALLOC     (1 << 3)
+
+static int test_flags = ~0;
+
+static void test_hash_prealloc(int cpu)
+{
+        __u64 start_time;
+        int i;
+
+        start_time = time_get_ns();
+        for (i = 0; i < MAX_CNT; i++)
+                syscall(__NR_getuid);
+        printf("%d: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;
+        int i;
+
+        start_time = time_get_ns();
+        for (i = 0; i < MAX_CNT; i++)
+                syscall(__NR_geteuid);
+        printf("%d:percpu_hash_map_perf pre-alloc %lld events per sec\n",
+               cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
+}
+
+static void test_hash_kmalloc(int cpu)
+{
+        __u64 start_time;
+        int i;
+
+        start_time = time_get_ns();
+        for (i = 0; i < MAX_CNT; i++)
+                syscall(__NR_getgid);
+        printf("%d:hash_map_perf kmalloc %lld events per sec\n",
+               cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
+}
+
+static void test_percpu_hash_kmalloc(int cpu)
+{
+        __u64 start_time;
+        int i;
+
+        start_time = time_get_ns();
+        for (i = 0; i < MAX_CNT; i++)
+                syscall(__NR_getegid);
+        printf("%d:percpu_hash_map_perf kmalloc %lld events per sec\n",
+               cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
+}
+
+static void loop(int cpu)
+{
+        cpu_set_t cpuset;
+
+        CPU_ZERO(&cpuset);
+        CPU_SET(cpu, &cpuset);
+        sched_setaffinity(0, sizeof(cpuset), &cpuset);
+
+        if (test_flags & HASH_PREALLOC)
+                test_hash_prealloc(cpu);
+
+        if (test_flags & PERCPU_HASH_PREALLOC)
+                test_percpu_hash_prealloc(cpu);
+
+        if (test_flags & HASH_KMALLOC)
+                test_hash_kmalloc(cpu);
+
+        if (test_flags & PERCPU_HASH_KMALLOC)
+                test_percpu_hash_kmalloc(cpu);
+}
+
+static void run_perf_test(int tasks)
+{
+        pid_t pid[tasks];
+        int i;
+
+        for (i = 0; i < tasks; i++) {
+                pid[i] = fork();
+                if (pid[i] == 0) {
+                        loop(i);
+                        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);
+        }
+}
+
+int main(int argc, char **argv)
+{
+        struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+        char filename[256];
+        int num_cpu = 8;
+
+        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+        setrlimit(RLIMIT_MEMLOCK, &r);
+
+        if (argc > 1)
+                test_flags = atoi(argv[1]) ? : test_flags;
+
+        if (argc > 2)
+                num_cpu = atoi(argv[2]) ? : num_cpu;
+
+        if (load_bpf_file(filename)) {
+                printf("%s", bpf_log_buf);
+                return 1;
+        }
+
+        run_perf_test(num_cpu);
+
+        return 0;
+}