diff options
Diffstat (limited to 'tools/testing/selftests/seccomp/seccomp_benchmark.c')
-rw-r--r-- | tools/testing/selftests/seccomp/seccomp_benchmark.c | 142 |
1 files changed, 100 insertions, 42 deletions
diff --git a/tools/testing/selftests/seccomp/seccomp_benchmark.c b/tools/testing/selftests/seccomp/seccomp_benchmark.c index 5b5c9d558dee..b83099160fbc 100644 --- a/tools/testing/selftests/seccomp/seccomp_benchmark.c +++ b/tools/testing/selftests/seccomp/seccomp_benchmark.c @@ -4,7 +4,9 @@ */ #define _GNU_SOURCE #include <assert.h> +#include <err.h> #include <limits.h> +#include <sched.h> #include <stdbool.h> #include <stddef.h> #include <stdio.h> @@ -38,10 +40,10 @@ unsigned long long timing(clockid_t clk_id, unsigned long long samples) i *= 1000000000ULL; i += finish.tv_nsec - start.tv_nsec; - printf("%lu.%09lu - %lu.%09lu = %llu (%.1fs)\n", - finish.tv_sec, finish.tv_nsec, - start.tv_sec, start.tv_nsec, - i, (double)i / 1000000000.0); + ksft_print_msg("%lu.%09lu - %lu.%09lu = %llu (%.1fs)\n", + finish.tv_sec, finish.tv_nsec, + start.tv_sec, start.tv_nsec, + i, (double)i / 1000000000.0); return i; } @@ -53,7 +55,7 @@ unsigned long long calibrate(void) pid_t pid, ret; int seconds = 15; - printf("Calibrating sample size for %d seconds worth of syscalls ...\n", seconds); + ksft_print_msg("Calibrating sample size for %d seconds worth of syscalls ...\n", seconds); samples = 0; pid = getpid(); @@ -76,8 +78,12 @@ unsigned long long calibrate(void) bool approx(int i_one, int i_two) { - double one = i_one, one_bump = one * 0.01; - double two = i_two, two_bump = two * 0.01; + /* + * This continues to be a noisy test. Instead of a 1% comparison + * go with 10%. + */ + double one = i_one, one_bump = one * 0.1; + double two = i_two, two_bump = two * 0.1; one_bump = one + MAX(one_bump, 2.0); two_bump = two + MAX(two_bump, 2.0); @@ -98,27 +104,65 @@ bool le(int i_one, int i_two) } long compare(const char *name_one, const char *name_eval, const char *name_two, - unsigned long long one, bool (*eval)(int, int), unsigned long long two) + unsigned long long one, bool (*eval)(int, int), unsigned long long two, + bool skip) { bool good; - printf("\t%s %s %s (%lld %s %lld): ", name_one, name_eval, name_two, - (long long)one, name_eval, (long long)two); + if (skip) { + ksft_test_result_skip("%s %s %s\n", name_one, name_eval, + name_two); + return 0; + } + + ksft_print_msg("\t%s %s %s (%lld %s %lld): ", name_one, name_eval, name_two, + (long long)one, name_eval, (long long)two); if (one > INT_MAX) { - printf("Miscalculation! Measurement went negative: %lld\n", (long long)one); - return 1; + ksft_print_msg("Miscalculation! Measurement went negative: %lld\n", (long long)one); + good = false; + goto out; } if (two > INT_MAX) { - printf("Miscalculation! Measurement went negative: %lld\n", (long long)two); - return 1; + ksft_print_msg("Miscalculation! Measurement went negative: %lld\n", (long long)two); + good = false; + goto out; } good = eval(one, two); printf("%s\n", good ? "✔️" : "❌"); +out: + ksft_test_result(good, "%s %s %s\n", name_one, name_eval, name_two); + return good ? 0 : 1; } +/* Pin to a single CPU so the benchmark won't bounce around the system. */ +void affinity(void) +{ + long cpu; + ulong ncores = sysconf(_SC_NPROCESSORS_CONF); + cpu_set_t *setp = CPU_ALLOC(ncores); + ulong setsz = CPU_ALLOC_SIZE(ncores); + + /* + * Totally unscientific way to avoid CPUs that might be busier: + * choose the highest CPU instead of the lowest. + */ + for (cpu = ncores - 1; cpu >= 0; cpu--) { + CPU_ZERO_S(setsz, setp); + CPU_SET_S(cpu, setsz, setp); + if (sched_setaffinity(getpid(), setsz, setp) == -1) + continue; + printf("Pinned to CPU %lu of %lu\n", cpu + 1, ncores); + goto out; + } + fprintf(stderr, "Could not set CPU affinity -- calibration may not work well"); + +out: + CPU_FREE(setp); +} + int main(int argc, char *argv[]) { struct sock_filter bitmap_filter[] = { @@ -142,27 +186,36 @@ int main(int argc, char *argv[]) unsigned long long samples, calc; unsigned long long native, filter1, filter2, bitmap1, bitmap2; unsigned long long entry, per_filter1, per_filter2; + bool skip = false; setbuf(stdout, NULL); - printf("Running on:\n"); + ksft_print_header(); + ksft_set_plan(7); + + ksft_print_msg("Running on:\n"); + ksft_print_msg(""); system("uname -a"); - printf("Current BPF sysctl settings:\n"); + ksft_print_msg("Current BPF sysctl settings:\n"); /* Avoid using "sysctl" which may not be installed. */ + ksft_print_msg(""); system("grep -H . /proc/sys/net/core/bpf_jit_enable"); + ksft_print_msg(""); system("grep -H . /proc/sys/net/core/bpf_jit_harden"); + affinity(); + if (argc > 1) samples = strtoull(argv[1], NULL, 0); else samples = calibrate(); - printf("Benchmarking %llu syscalls...\n", samples); + ksft_print_msg("Benchmarking %llu syscalls...\n", samples); /* Native call */ native = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples; - printf("getpid native: %llu ns\n", native); + ksft_print_msg("getpid native: %llu ns\n", native); ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); assert(ret == 0); @@ -172,35 +225,37 @@ int main(int argc, char *argv[]) assert(ret == 0); bitmap1 = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples; - printf("getpid RET_ALLOW 1 filter (bitmap): %llu ns\n", bitmap1); + ksft_print_msg("getpid RET_ALLOW 1 filter (bitmap): %llu ns\n", bitmap1); /* Second filter resulting in a bitmap */ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bitmap_prog); assert(ret == 0); bitmap2 = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples; - printf("getpid RET_ALLOW 2 filters (bitmap): %llu ns\n", bitmap2); + ksft_print_msg("getpid RET_ALLOW 2 filters (bitmap): %llu ns\n", bitmap2); /* Third filter, can no longer be converted to bitmap */ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); assert(ret == 0); filter1 = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples; - printf("getpid RET_ALLOW 3 filters (full): %llu ns\n", filter1); + ksft_print_msg("getpid RET_ALLOW 3 filters (full): %llu ns\n", filter1); /* Fourth filter, can not be converted to bitmap because of filter 3 */ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bitmap_prog); assert(ret == 0); filter2 = timing(CLOCK_PROCESS_CPUTIME_ID, samples) / samples; - printf("getpid RET_ALLOW 4 filters (full): %llu ns\n", filter2); + ksft_print_msg("getpid RET_ALLOW 4 filters (full): %llu ns\n", filter2); /* Estimations */ #define ESTIMATE(fmt, var, what) do { \ var = (what); \ - printf("Estimated " fmt ": %llu ns\n", var); \ - if (var > INT_MAX) \ - goto more_samples; \ + ksft_print_msg("Estimated " fmt ": %llu ns\n", var); \ + if (var > INT_MAX) { \ + skip = true; \ + ret |= 1; \ + } \ } while (0) ESTIMATE("total seccomp overhead for 1 bitmapped filter", calc, @@ -218,31 +273,34 @@ int main(int argc, char *argv[]) ESTIMATE("seccomp per-filter overhead (filters / 4)", per_filter2, (filter2 - native - entry) / 4); - printf("Expectations:\n"); - ret |= compare("native", "≤", "1 bitmap", native, le, bitmap1); - bits = compare("native", "≤", "1 filter", native, le, filter1); + ksft_print_msg("Expectations:\n"); + ret |= compare("native", "≤", "1 bitmap", native, le, bitmap1, + skip); + bits = compare("native", "≤", "1 filter", native, le, filter1, + skip); if (bits) - goto more_samples; + skip = true; ret |= compare("per-filter (last 2 diff)", "≈", "per-filter (filters / 4)", - per_filter1, approx, per_filter2); + per_filter1, approx, per_filter2, skip); bits = compare("1 bitmapped", "≈", "2 bitmapped", - bitmap1 - native, approx, bitmap2 - native); + bitmap1 - native, approx, bitmap2 - native, skip); if (bits) { - printf("Skipping constant action bitmap expectations: they appear unsupported.\n"); - goto out; + ksft_print_msg("Skipping constant action bitmap expectations: they appear unsupported.\n"); + skip = true; } - ret |= compare("entry", "≈", "1 bitmapped", entry, approx, bitmap1 - native); - ret |= compare("entry", "≈", "2 bitmapped", entry, approx, bitmap2 - native); + ret |= compare("entry", "≈", "1 bitmapped", entry, approx, + bitmap1 - native, skip); + ret |= compare("entry", "≈", "2 bitmapped", entry, approx, + bitmap2 - native, skip); ret |= compare("native + entry + (per filter * 4)", "≈", "4 filters total", - entry + (per_filter1 * 4) + native, approx, filter2); - if (ret == 0) - goto out; + entry + (per_filter1 * 4) + native, approx, filter2, + skip); -more_samples: - printf("Saw unexpected benchmark result. Try running again with more samples?\n"); -out: - return 0; + if (ret) + ksft_print_msg("Saw unexpected benchmark result. Try running again with more samples?\n"); + + ksft_finished(); } |