cregit-Linux how code gets into the kernel

Release 4.7 samples/bpf/map_perf_test_user.c

Directory: samples/bpf
/* 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 <sys/resource.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; }

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PersonTokensPropCommitsCommitProp
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Total31100.00%1100.00%

#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)); }

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alexei starovoitovalexei starovoitov56100.00%1100.00%
Total56100.00%1100.00%


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)); }

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PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov56100.00%1100.00%
Total56100.00%1100.00%


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)); }

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PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov56100.00%1100.00%
Total56100.00%1100.00%


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)); }

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alexei starovoitovalexei starovoitov56100.00%1100.00%
Total56100.00%1100.00%


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); }

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alexei starovoitovalexei starovoitov83100.00%1100.00%
Total83100.00%1100.00%


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); } }

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PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov133100.00%1100.00%
Total133100.00%1100.00%


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; }

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alexei starovoitovalexei starovoitov124100.00%1100.00%
Total124100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov66899.55%150.00%
naveen n. raonaveen n. rao30.45%150.00%
Total671100.00%2100.00%
Directory: samples/bpf
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