From: Arnaldo Carvalho de Melo Date: Mon, 20 May 2019 17:58:03 +0000 (-0300) Subject: perf trace: Beautify 'move_mount' arguments X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=566e30229e1f4be67c4771afc057152d62016c9c;p=openwrt%2Fstaging%2Fblogic.git perf trace: Beautify 'move_mount' arguments Use existing beautifiers for the first 4 args (to/from fds, pathnames) and wire up the recently introduced move_mount flags table generator. Now it should be possible to just use: perf trace -e move_mount As root and see all move_mount syscalls with its args beautified, except for the filenames, that need work in the augmented_raw_syscalls.c eBPF helper to pass more than one, see comment in the augmented_raw_syscalls.c source code, the other args should work in all cases, i.e. all that is needed can be obtained directly from the raw_syscalls:sys_enter tracepoint args. Running without the strace "skin" (.perfconfig setting output formatting switches to look like strace output + BPF to collect strings, as we still need to support collecting multiple string args for the same syscall, like with move_mount): # cat sys_move_mount.c #define _GNU_SOURCE /* See feature_test_macros(7) */ #include #include /* For SYS_xxx definitions */ #define __NR_move_mount 429 #define MOVE_MOUNT_F_SYMLINKS 0x00000001 /* Follow symlinks on from path */ #define MOVE_MOUNT_F_AUTOMOUNTS 0x00000002 /* Follow automounts on from path */ #define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */ #define MOVE_MOUNT_T_SYMLINKS 0x00000010 /* Follow symlinks on to path */ #define MOVE_MOUNT_T_AUTOMOUNTS 0x00000020 /* Follow automounts on to path */ #define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */ static inline int sys_move_mount(int from_fd, const char *from_pathname, int to_fd, const char *to_pathname, int flags) { syscall(__NR_move_mount, from_fd, from_pathname, to_fd, to_pathname, flags); } int main(int argc, char *argv[]) { int flags = 0, from_fd = 0, to_fd = 100; sys_move_mount(from_fd++, "/foo", to_fd++, "bar", flags); flags |= MOVE_MOUNT_F_SYMLINKS; sys_move_mount(from_fd++, "/foo1", to_fd++, "bar1", flags); flags |= MOVE_MOUNT_F_AUTOMOUNTS; sys_move_mount(from_fd++, "/foo2", to_fd++, "bar2", flags); flags |= MOVE_MOUNT_F_EMPTY_PATH; sys_move_mount(from_fd++, "/foo3", to_fd++, "bar3", flags); flags |= MOVE_MOUNT_T_SYMLINKS; sys_move_mount(from_fd++, "/foo4", to_fd++, "bar4", flags); flags |= MOVE_MOUNT_T_AUTOMOUNTS; sys_move_mount(from_fd++, "/foo5", to_fd++, "bar5", flags); flags |= MOVE_MOUNT_T_EMPTY_PATH; return sys_move_mount(from_fd++, "/foo6", to_fd++, "bar6", flags); } # mv ~/.perfconfig ~/.perfconfig.OFF # perf trace -e move_mount ./sys_move_mount 0.000 ( 0.009 ms): sys_move_mount/28971 move_mount(from_pathname: 0x402010, to_dfd: 100, to_pathname: 0x402015) = -1 ENOENT (No such file or directory) 0.011 ( 0.003 ms): sys_move_mount/28971 move_mount(from_dfd: 1, from_pathname: 0x40201e, to_dfd: 101, to_pathname: 0x402019, flags: F_SYMLINKS) = -1 ENOENT (No such file or directory) 0.016 ( 0.002 ms): sys_move_mount/28971 move_mount(from_dfd: 2, from_pathname: 0x402029, to_dfd: 102, to_pathname: 0x402024, flags: F_SYMLINKS|F_AUTOMOUNTS) = -1 ENOENT (No such file or directory) 0.020 ( 0.002 ms): sys_move_mount/28971 move_mount(from_dfd: 3, from_pathname: 0x402034, to_dfd: 103, to_pathname: 0x40202f, flags: F_SYMLINKS|F_AUTOMOUNTS|F_EMPTY_PATH) = -1 ENOENT (No such file or directory) 0.023 ( 0.002 ms): sys_move_mount/28971 move_mount(from_dfd: 4, from_pathname: 0x40203f, to_dfd: 104, to_pathname: 0x40203a, flags: F_SYMLINKS|F_AUTOMOUNTS|F_EMPTY_PATH|T_SYMLINKS) = -1 ENOENT (No such file or directory) 0.027 ( 0.002 ms): sys_move_mount/28971 move_mount(from_dfd: 5, from_pathname: 0x40204a, to_dfd: 105, to_pathname: 0x402045, flags: F_SYMLINKS|F_AUTOMOUNTS|F_EMPTY_PATH|T_SYMLINKS|T_AUTOMOUNTS) = -1 ENOENT (No such file or directory) 0.031 ( 0.017 ms): sys_move_mount/28971 move_mount(from_dfd: 6, from_pathname: 0x402055, to_dfd: 106, to_pathname: 0x402050, flags: F_SYMLINKS|F_AUTOMOUNTS|F_EMPTY_PATH|T_SYMLINKS|T_AUTOMOUNTS|T_EMPTY_PATH) = -1 ENOENT (No such file or directory) # Cc: Adrian Hunter Cc: Al Viro Cc: Brendan Gregg Cc: David Howells Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-83rim8g4k0s4gieieh5nnlck@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index c706548d5b10..20448d8cc162 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -493,6 +493,12 @@ mount_flags_tbl := $(srctree)/tools/perf/trace/beauty/mount_flags.sh $(mount_flags_array): $(linux_uapi_dir)/fs.h $(mount_flags_tbl) $(Q)$(SHELL) '$(mount_flags_tbl)' $(linux_uapi_dir) > $@ +move_mount_flags_array := $(beauty_outdir)/move_mount_flags_array.c +move_mount_flags_tbl := $(srctree)/tools/perf/trace/beauty/move_mount_flags.sh + +$(move_mount_flags_array): $(linux_uapi_dir)/fs.h $(move_mount_flags_tbl) + $(Q)$(SHELL) '$(move_mount_flags_tbl)' $(linux_uapi_dir) > $@ + prctl_option_array := $(beauty_outdir)/prctl_option_array.c prctl_hdr_dir := $(srctree)/tools/include/uapi/linux/ prctl_option_tbl := $(srctree)/tools/perf/trace/beauty/prctl_option.sh @@ -638,6 +644,7 @@ prepare: $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h archheaders $(drm_ioc $(madvise_behavior_array) \ $(mmap_flags_array) \ $(mount_flags_array) \ + $(move_mount_flags_array) \ $(perf_ioctl_array) \ $(prctl_option_array) \ $(usbdevfs_ioctl_array) \ @@ -925,6 +932,7 @@ clean:: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean $(LIBBPF)-clean $(LIBSUBCMD)-clea $(OUTPUT)$(madvise_behavior_array) \ $(OUTPUT)$(mmap_flags_array) \ $(OUTPUT)$(mount_flags_array) \ + $(OUTPUT)$(move_mount_flags_array) \ $(OUTPUT)$(drm_ioctl_array) \ $(OUTPUT)$(pkey_alloc_access_rights_array) \ $(OUTPUT)$(sndrv_ctl_ioctl_array) \ diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index f5b3a1e9c1dd..b76c950e4393 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -775,6 +775,12 @@ static struct syscall_fmt { .arg = { [0] = { .scnprintf = SCA_FILENAME, /* dev_name */ }, [3] = { .scnprintf = SCA_MOUNT_FLAGS, /* flags */ .mask_val = SCAMV_MOUNT_FLAGS, /* flags */ }, }, }, + { .name = "move_mount", + .arg = { [0] = { .scnprintf = SCA_FDAT, /* from_dfd */ }, + [1] = { .scnprintf = SCA_FILENAME, /* from_pathname */ }, + [2] = { .scnprintf = SCA_FDAT, /* to_dfd */ }, + [3] = { .scnprintf = SCA_FILENAME, /* to_pathname */ }, + [4] = { .scnprintf = SCA_MOVE_MOUNT_FLAGS, /* flags */ }, }, }, { .name = "mprotect", .arg = { [0] = { .scnprintf = SCA_HEX, /* start */ }, [2] = { .scnprintf = SCA_MMAP_PROT, /* prot */ }, }, }, diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c index b292e763f3c7..8d0c0976696e 100644 --- a/tools/perf/examples/bpf/augmented_raw_syscalls.c +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -117,6 +117,7 @@ struct augmented_filename { #define SYS_RENAMEAT2 316 #define SYS_EXECVEAT 322 #define SYS_STATX 332 +#define SYS_MOVE_MOUNT 429 pid_filter(pids_filtered); @@ -257,6 +258,16 @@ int sys_enter(struct syscall_enter_args *args) case SYS_LINKAT: case SYS_MKDIRAT: case SYS_MKNODAT: + // case SYS_MOVE_MOUNT: + // For now don't copy move_mount first string arg, as it has two and + // 'perf trace's syscall_arg__scnprintf_filename() will use the one + // copied here, the first, for both args, duplicating the first and + // ignoring the second. + // + // We need to copy both here and make syscall_arg__scnprintf_filename + // skip the first when reading the second, using the size of the first, etc. + // Shouldn't be difficult, but now its perf/urgent time, lets wait for + // the next devel window. case SYS_MQ_TIMEDSEND: case SYS_NAME_TO_HANDLE_AT: case SYS_NEWFSTATAT: diff --git a/tools/perf/trace/beauty/Build b/tools/perf/trace/beauty/Build index 85f328ddf897..d84812c094ba 100644 --- a/tools/perf/trace/beauty/Build +++ b/tools/perf/trace/beauty/Build @@ -6,6 +6,7 @@ perf-y += ioctl.o endif perf-y += kcmp.o perf-y += mount_flags.o +perf-y += move_mount.o perf-y += pkey_alloc.o perf-y += arch_prctl.o perf-y += prctl.o diff --git a/tools/perf/trace/beauty/beauty.h b/tools/perf/trace/beauty/beauty.h index 139d485a6f16..dfb84032d8eb 100644 --- a/tools/perf/trace/beauty/beauty.h +++ b/tools/perf/trace/beauty/beauty.h @@ -156,6 +156,9 @@ unsigned long syscall_arg__mask_val_mount_flags(struct syscall_arg *arg, unsigne size_t syscall_arg__scnprintf_mount_flags(char *bf, size_t size, struct syscall_arg *arg); #define SCA_MOUNT_FLAGS syscall_arg__scnprintf_mount_flags +size_t syscall_arg__scnprintf_move_mount_flags(char *bf, size_t size, struct syscall_arg *arg); +#define SCA_MOVE_MOUNT_FLAGS syscall_arg__scnprintf_move_mount_flags + size_t syscall_arg__scnprintf_pkey_alloc_access_rights(char *bf, size_t size, struct syscall_arg *arg); #define SCA_PKEY_ALLOC_ACCESS_RIGHTS syscall_arg__scnprintf_pkey_alloc_access_rights diff --git a/tools/perf/trace/beauty/move_mount.c b/tools/perf/trace/beauty/move_mount.c new file mode 100644 index 000000000000..78ed80395406 --- /dev/null +++ b/tools/perf/trace/beauty/move_mount.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * trace/beauty/move_mount.c + * + * Copyright (C) 2019, Red Hat Inc, Arnaldo Carvalho de Melo + */ + +#include "trace/beauty/beauty.h" +#include + +static size_t move_mount__scnprintf_flags(unsigned long flags, char *bf, size_t size, bool show_prefix) +{ +#include "trace/beauty/generated/move_mount_flags_array.c" + static DEFINE_STRARRAY(move_mount_flags, "MOVE_MOUNT_"); + + return strarray__scnprintf_flags(&strarray__move_mount_flags, bf, size, show_prefix, flags); +} + +size_t syscall_arg__scnprintf_move_mount_flags(char *bf, size_t size, struct syscall_arg *arg) +{ + unsigned long flags = arg->val; + + return move_mount__scnprintf_flags(flags, bf, size, arg->show_string_prefix); +}