On Tue, 2024-06-25 at 13:00 +0200, Mateusz Guzik wrote: > + if (flags == AT_EMPTY_PATH && vfs_empty_path(dfd, filename)) Could it be if ((flags & AT_EMPTY_PATH) && vfs_empty_path(dfd, filename)) instead? When fstatat is implemented with statx AT_NO_AUTOMOUNT is needed, or at least Glibc developers think it's needed: #if FSTATAT_USE_STATX static inline int fstatat64_time64_statx (int fd, const char *file, struct __stat64_t64 *buf, int flag) { /* 32-bit kABI with default 64-bit time_t, e.g. arc, riscv32. Also 64-bit time_t support is done through statx syscall. */ struct statx tmp; int r = INTERNAL_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag, STATX_BASIC_STATS, &tmp); so "flags == AT_EMPTY_PATH" won't be true if Glibc implements fstatat and fstat via statx (on LoongArch and 32-bit platforms). I was just surprised when I saw a 100%+ improve for statx("", AT_EMPTY_PATH) but not stat on the Loongson machine. > + return do_statx_fd(dfd, flags, mask, buffer); > + > name = getname_flags(filename, getname_statx_lookup_flags(flags), NULL); -- Xi Ruoyao <xry111@xxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University