Arnaldo Carvalho de Melo f6af095668 perf trace: Beautify 'fsmount' arguments ... Use existing beautifiers for the first arg, fd, assigned using the heuristic that looks for syscall arg names and associates SCA_FD with 'fd' named argumes, and wire up the recently introduced fsmount attr_flags table generator. Now it should be possible to just use: perf trace -e fsmount As root and see all fsmount syscalls with its args beautified. # cat sys_fsmount.c #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <unistd.h> #include <sys/syscall.h> /* For SYS_xxx definitions */ #define __NR_fsmount 432 #define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */ #define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */ #define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */ #define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */ #define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */ #define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */ #define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */ #define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */ #define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */ static inline int sys_fsmount(int fs_fd, int flags, int attr_flags) { syscall(__NR_fsmount, fs_fd, flags, attr_flags); } int main(int argc, char *argv[]) { int attr_flags = 0, fs_fd = 0; sys_fsmount(fs_fd++, 0, attr_flags); attr_flags |= MOUNT_ATTR_RDONLY; sys_fsmount(fs_fd++, 1, attr_flags); attr_flags |= MOUNT_ATTR_NOSUID; sys_fsmount(fs_fd++, 0, attr_flags); attr_flags |= MOUNT_ATTR_NODEV; sys_fsmount(fs_fd++, 1, attr_flags); attr_flags |= MOUNT_ATTR_NOEXEC; sys_fsmount(fs_fd++, 0, attr_flags); attr_flags |= MOUNT_ATTR_NOATIME; sys_fsmount(fs_fd++, 1, attr_flags); attr_flags |= MOUNT_ATTR_STRICTATIME; sys_fsmount(fs_fd++, 0, attr_flags); attr_flags |= MOUNT_ATTR_NODIRATIME; sys_fsmount(fs_fd++, 0, attr_flags); return 0; } # # perf trace -e fsmount ./sys_fsmount fsmount(0, 0, MOUNT_ATTR_RELATIME) = -1 EINVAL (Invalid argument) fsmount(1, FSMOUNT_CLOEXEC, MOUNT_ATTR_RDONLY|MOUNT_ATTR_RELATIME) = -1 EINVAL (Invalid argument) fsmount(2, 0, MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_RELATIME) = -1 EINVAL (Invalid argument) fsmount(3, FSMOUNT_CLOEXEC, MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_NODEV|MOUNT_ATTR_RELATIME) = -1 EBADF (Bad file descriptor) fsmount(4, 0, MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_NODEV|MOUNT_ATTR_NOEXEC|MOUNT_ATTR_RELATIME) = -1 EBADF (Bad file descriptor) fsmount(5, FSMOUNT_CLOEXEC, MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_NODEV|MOUNT_ATTR_NOEXEC|MOUNT_ATTR_NOATIME) = -1 EBADF (Bad file descriptor) fsmount(6, 0, MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_NODEV|MOUNT_ATTR_NOEXEC|MOUNT_ATTR_NOATIME|MOUNT_ATTR_STRICTATIME) = -1 EINVAL (Invalid argument) fsmount(7, 0, MOUNT_ATTR_RDONLY|MOUNT_ATTR_NOSUID|MOUNT_ATTR_NODEV|MOUNT_ATTR_NOEXEC|MOUNT_ATTR_NOATIME|MOUNT_ATTR_STRICTATIME|MOUNT_ATTR_NODIRATIME) = -1 EINVAL (Invalid argument) # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-w71uge0sfo6ns9uclhwtthca@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2019-05-28 18:37:43 -03:00
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beauty	perf trace: Beautify 'fsmount' arguments	2019-05-28 18:37:43 -03:00
strace/groups	perf trace: Add 'string' event alias to select syscalls with string args	2019-04-01 14:49:24 -03:00