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https://github.com/Droid-Deck/DroidDeck.git
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maxjivi05
fc90b80fd8
Preload library answers stat/open/access/readlink in-process via a trampoline page proot 0014 lets through seccomp. On by default with a Performance toggle; also sets GLIBC_TUNABLES rseq=0 and malloc top_pad.
79 lines
3.3 KiB
C
79 lines
3.3 KiB
C
/* Per-syscall latency under whatever runs this program (native, proot, ...).
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* Usage: sysbench <deep-file> [iterations]
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* Prints "name ns/op" lines. */
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <linux/futex.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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static double now(void) {
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struct timespec t;
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clock_gettime(CLOCK_MONOTONIC, &t);
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return t.tv_sec * 1e9 + t.tv_nsec;
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}
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#define BENCH(name, n, body) \
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do { \
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for (int _w = 0; _w < (n) / 10 + 1; _w++) { body; } \
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double _t0 = now(); \
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for (int _i = 0; _i < (n); _i++) { body; } \
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printf("%-28s %10.0f ns\n", name, (now() - _t0) / (n)); \
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fflush(stdout); \
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} while (0)
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static void *thread_fn(void *a) { return a; }
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int main(int argc, char **argv) {
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const char *deep = argc > 1 ? argv[1] : "/usr/lib/python3.14/os.py";
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int n = argc > 2 ? atoi(argv[2]) : 20000;
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struct stat st;
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char buf[4096];
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int pfd[2];
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pipe(pfd);
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int fd = open(deep, O_RDONLY);
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if (fd < 0) { perror(deep); return 1; }
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int futexword = 0;
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char *slash = strrchr(deep, '/');
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char dir[1024];
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snprintf(dir, sizeof dir, "%.*s", (int)(slash - deep), deep);
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int dfd = open(dir, O_RDONLY | O_DIRECTORY);
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BENCH("getppid (untraced)", n, syscall(SYS_getppid));
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BENCH("futex wake (untraced)", n, syscall(SYS_futex, &futexword, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0));
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BENCH("clock_gettime (vdso)", n, { struct timespec t; clock_gettime(CLOCK_MONOTONIC, &t); });
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BENCH("fstat fd (untraced)", n, fstat(fd, &st));
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BENCH("pread 4k (untraced)", n, pread(fd, buf, sizeof buf, 0));
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BENCH("ioctl FIONREAD (untraced*)", n, { int v; ioctl(pfd[0], FIONREAD, &v); });
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BENCH("fstatat relative dirfd", n, fstatat(dfd, slash + 1, &st, 0));
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BENCH("stat deep abs path", n, stat(deep, &st));
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BENCH("lstat deep abs path", n, lstat(deep, &st));
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BENCH("statx deep abs path", n, { struct statx sx; statx(AT_FDCWD, deep, 0, STATX_BASIC_STATS, &sx); });
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BENCH("access deep abs path", n, access(deep, R_OK));
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BENCH("open+close deep abs", n, close(open(deep, O_RDONLY)));
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BENCH("stat ENOENT", n, stat("/usr/lib/does/not/exist.so", &st));
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BENCH("readlink /proc/self/exe", n, readlink("/proc/self/exe", buf, sizeof buf));
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BENCH("getcwd", n, getcwd(buf, sizeof buf));
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BENCH("uname", n, { struct utsname_dummy { char b[65 * 6]; } u; syscall(SYS_uname, &u); });
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BENCH("memfd_create+close", n / 4, close(memfd_create("x", MFD_CLOEXEC)));
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BENCH("brk(0) query", n, syscall(SYS_brk, 0));
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BENCH("mmap+munmap 64k", n, munmap(mmap(0, 65536, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0), 65536));
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BENCH("pthread create+join", n / 20, { pthread_t t; pthread_create(&t, 0, thread_fn, 0); pthread_join(t, 0); });
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BENCH("fork+_exit+wait", n / 100, { pid_t p = fork(); if (!p) _exit(0); waitpid(p, 0, 0); });
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if (argc > 3) {
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char *const av[] = {argv[3], NULL};
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BENCH("fork+execve true+wait", n / 200, { pid_t p = fork(); if (!p) { execv(argv[3], av); _exit(127); } waitpid(p, 0, 0); });
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}
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return 0;
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}
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