From fd5cead23f54697310bd565aa2a23ae5128080a0 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 14 Mar 2017 16:19:30 -0300 Subject: [PATCH] perf trace: Beautify statx syscall 'flag' and 'mask' arguments To test it, build samples/statx/test_statx, which I did as: $ make headers_install $ cc -I ~/git/linux/usr/include samples/statx/test-statx.c -o /tmp/statx And then use perf trace on it: # perf trace -e statx /tmp/statx /etc/passwd statx(/etc/passwd) = 0 results=7ff Size: 3496 Blocks: 8 IO Block: 4096 regular file Device: fd:00 Inode: 280156 Links: 1 Access: (0644/-rw-r--r--) Uid: 0 Gid: 0 Access: 2017-03-29 16:01:01.650073438-0300 Modify: 2017-03-10 16:25:14.156479354-0300 Change: 2017-03-10 16:25:14.171479328-0300 0.000 ( 0.007 ms): statx/30648 statx(dfd: CWD, filename: 0x7ef503f4, flags: SYMLINK_NOFOLLOW, mask: TYPE|MODE|NLINK|UID|GID|ATIME|MTIME|CTIME|INO|SIZE|BLOCKS|BTIME, buffer: 0x7fff7ef4eb10) = 0 # Using the test-stat.c options to change the mask: # perf trace -e statx /tmp/statx -O /etc/passwd > /dev/null 0.000 ( 0.008 ms): statx/30745 statx(dfd: CWD, filename: 0x3a0753f4, flags: SYMLINK_NOFOLLOW, mask: BTIME, buffer: 0x7ffd3a0735c0) = 0 # # perf trace -e statx /tmp/statx -A /etc/passwd > /dev/null 0.000 ( 0.010 ms): statx/30757 statx(dfd: CWD, filename: 0xa94e63f4, flags: SYMLINK_NOFOLLOW|NO_AUTOMOUNT, mask: TYPE|MODE|NLINK|UID|GID|ATIME|MTIME|CTIME|INO|SIZE|BLOCKS|BTIME, buffer: 0x7ffea94e49d0) = 0 # # trace --no-inherit -e statx /tmp/statx -F /etc/passwd > /dev/null 0.000 ( 0.011 ms): statx(dfd: CWD, filename: 0x3b02d3f3, flags: SYMLINK_NOFOLLOW|STATX_FORCE_SYNC, mask: TYPE|MODE|NLINK|UID|GID|ATIME|MTIME|CTIME|INO|SIZE|BLOCKS|BTIME, buffer: 0x7ffd3b02c850) = 0 # # trace --no-inherit -e statx /tmp/statx -F -L /etc/passwd > /dev/null 0.000 ( 0.008 ms): statx(dfd: CWD, filename: 0x15cff3f3, flags: STATX_FORCE_SYNC, mask: TYPE|MODE|NLINK|UID|GID|ATIME|MTIME|CTIME|INO|SIZE|BLOCKS|BTIME, buffer: 0x7fff15cfdda0) = 0 # # trace --no-inherit -e statx /tmp/statx -D -O /etc/passwd > /dev/null 0.000 ( 0.009 ms): statx(dfd: CWD, filename: 0xfa37f3f3, flags: SYMLINK_NOFOLLOW|STATX_DONT_SYNC, mask: BTIME, buffer: 0x7ffffa37da20) = 0 # Adding a probe to get the filename collected as well: # perf probe 'vfs_getname=getname_flags:72 pathname=result->name:string' Added new event: probe:vfs_getname (on getname_flags:72 with pathname=result->name:string) You can now use it in all perf tools, such as: perf record -e probe:vfs_getname -aR sleep 1 # trace --no-inherit -e statx /tmp/statx -D -O /etc/passwd > /dev/null 0.169 ( 0.007 ms): statx(dfd: CWD, filename: /etc/passwd, flags: SYMLINK_NOFOLLOW|STATX_DONT_SYNC, mask: BTIME, buffer: 0x7ffda9bf50f0) = 0 # Same technique could be used to collect and beautify the result put in the 'buffer' argument. Finally do a system wide 'perf trace' session looking for any use of statx, then run the test proggie with various flags: # trace -e statx 16612.967 ( 0.028 ms): statx/4562 statx(dfd: CWD, filename: /tmp/statx, flags: SYMLINK_NOFOLLOW, mask: TYPE|MODE|NLINK|UID|GID|ATIME|MTIME|CTIME|INO|SIZE|BLOCKS|BTIME, buffer: 0x7ffef195d660) = 0 33064.447 ( 0.011 ms): statx/4569 statx(dfd: CWD, filename: /tmp/statx, flags: SYMLINK_NOFOLLOW|STATX_FORCE_SYNC, mask: TYPE|MODE|NLINK|UID|GID|ATIME|MTIME|CTIME|INO|SIZE|BLOCKS|BTIME, buffer: 0x7ffc5484c790) = 0 36050.891 ( 0.023 ms): statx/4576 statx(dfd: CWD, filename: /tmp/statx, flags: SYMLINK_NOFOLLOW, mask: BTIME, buffer: 0x7ffeb18b66e0) = 0 38039.889 ( 0.023 ms): statx/4584 statx(dfd: CWD, filename: /tmp/statx, flags: SYMLINK_NOFOLLOW, mask: TYPE|MODE|NLINK|UID|GID|ATIME|MTIME|CTIME|INO|SIZE|BLOCKS|BTIME, buffer: 0x7fff1db0ea90) = 0 ^C# This one also starts moving the beautifiers from files directly included in builtin-trace.c to separate objects + a beauty.h header with prototypes, so that we can add test cases in tools/perf/tests/ to fire syscalls with various arguments and then get them intercepted as syscalls:sys_enter_foo or raw_syscalls:sys_enter + sys_exit to then format and check that the formatted output is the one we expect. Cc: Adrian Hunter Cc: Al Viro Cc: David Ahern Cc: David Howells Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-xvzw8eynffvez5czyzidhrno@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Build | 1 + .../arch/x86/entry/syscalls/syscall_64.tbl | 1 + tools/perf/builtin-trace.c | 14 ++-- tools/perf/trace/beauty/Build | 1 + tools/perf/trace/beauty/beauty.h | 24 +++++++ tools/perf/trace/beauty/statx.c | 72 +++++++++++++++++++ 6 files changed, 104 insertions(+), 9 deletions(-) create mode 100644 tools/perf/trace/beauty/Build create mode 100644 tools/perf/trace/beauty/beauty.h create mode 100644 tools/perf/trace/beauty/statx.c diff --git a/tools/perf/Build b/tools/perf/Build index 9b79f8d7db50..bd8eeb60533c 100644 --- a/tools/perf/Build +++ b/tools/perf/Build @@ -50,5 +50,6 @@ libperf-y += util/ libperf-y += arch/ libperf-y += ui/ libperf-y += scripts/ +libperf-y += trace/beauty/ gtk-y += ui/gtk/ diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl index e93ef0b38db8..5aef183e2f85 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl @@ -338,6 +338,7 @@ 329 common pkey_mprotect sys_pkey_mprotect 330 common pkey_alloc sys_pkey_alloc 331 common pkey_free sys_pkey_free +332 common statx sys_statx # # x32-specific system call numbers start at 512 to avoid cache impact diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 7379792a6504..fce278d5fada 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -31,6 +31,7 @@ #include "util/intlist.h" #include "util/thread_map.h" #include "util/stat.h" +#include "trace/beauty/beauty.h" #include "trace-event.h" #include "util/parse-events.h" #include "util/bpf-loader.h" @@ -267,15 +268,6 @@ out_delete: ({ struct syscall_tp *fields = evsel->priv; \ fields->name.pointer(&fields->name, sample); }) -struct syscall_arg { - unsigned long val; - struct thread *thread; - struct trace *trace; - void *parm; - u8 idx; - u8 mask; -}; - struct strarray { int offset; int nr_entries; @@ -771,6 +763,10 @@ static struct syscall_fmt { .arg_parm = { [0] = &strarray__socket_families, /* family */ }, }, { .name = "stat", .errmsg = true, .alias = "newstat", }, { .name = "statfs", .errmsg = true, }, + { .name = "statx", .errmsg = true, + .arg_scnprintf = { [0] = SCA_FDAT, /* flags */ + [2] = SCA_STATX_FLAGS, /* flags */ + [3] = SCA_STATX_MASK, /* mask */ }, }, { .name = "swapoff", .errmsg = true, .arg_scnprintf = { [0] = SCA_FILENAME, /* specialfile */ }, }, { .name = "swapon", .errmsg = true, diff --git a/tools/perf/trace/beauty/Build b/tools/perf/trace/beauty/Build new file mode 100644 index 000000000000..be95ac6ce845 --- /dev/null +++ b/tools/perf/trace/beauty/Build @@ -0,0 +1 @@ +libperf-y += statx.o diff --git a/tools/perf/trace/beauty/beauty.h b/tools/perf/trace/beauty/beauty.h new file mode 100644 index 000000000000..cf50be3f17a4 --- /dev/null +++ b/tools/perf/trace/beauty/beauty.h @@ -0,0 +1,24 @@ +#ifndef _PERF_TRACE_BEAUTY_H +#define _PERF_TRACE_BEAUTY_H + +#include + +struct trace; +struct thread; + +struct syscall_arg { + unsigned long val; + struct thread *thread; + struct trace *trace; + void *parm; + u8 idx; + u8 mask; +}; + +size_t syscall_arg__scnprintf_statx_flags(char *bf, size_t size, struct syscall_arg *arg); +#define SCA_STATX_FLAGS syscall_arg__scnprintf_statx_flags + +size_t syscall_arg__scnprintf_statx_mask(char *bf, size_t size, struct syscall_arg *arg); +#define SCA_STATX_MASK syscall_arg__scnprintf_statx_mask + +#endif /* _PERF_TRACE_BEAUTY_H */ diff --git a/tools/perf/trace/beauty/statx.c b/tools/perf/trace/beauty/statx.c new file mode 100644 index 000000000000..5643b692af4c --- /dev/null +++ b/tools/perf/trace/beauty/statx.c @@ -0,0 +1,72 @@ +/* + * trace/beauty/statx.c + * + * Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo + * + * Released under the GPL v2. (and only v2, not any later version) + */ + +#include "trace/beauty/beauty.h" +#include +#include +#include +#include + +size_t syscall_arg__scnprintf_statx_flags(char *bf, size_t size, struct syscall_arg *arg) +{ + int printed = 0, flags = arg->val; + + if (flags == 0) + return scnprintf(bf, size, "SYNC_AS_STAT"); +#define P_FLAG(n) \ + if (flags & AT_##n) { \ + printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \ + flags &= ~AT_##n; \ + } + + P_FLAG(SYMLINK_NOFOLLOW); + P_FLAG(REMOVEDIR); + P_FLAG(SYMLINK_FOLLOW); + P_FLAG(NO_AUTOMOUNT); + P_FLAG(EMPTY_PATH); + P_FLAG(STATX_FORCE_SYNC); + P_FLAG(STATX_DONT_SYNC); + +#undef P_FLAG + + if (flags) + printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags); + + return printed; +} + +size_t syscall_arg__scnprintf_statx_mask(char *bf, size_t size, struct syscall_arg *arg) +{ + int printed = 0, flags = arg->val; + +#define P_FLAG(n) \ + if (flags & STATX_##n) { \ + printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \ + flags &= ~STATX_##n; \ + } + + P_FLAG(TYPE); + P_FLAG(MODE); + P_FLAG(NLINK); + P_FLAG(UID); + P_FLAG(GID); + P_FLAG(ATIME); + P_FLAG(MTIME); + P_FLAG(CTIME); + P_FLAG(INO); + P_FLAG(SIZE); + P_FLAG(BLOCKS); + P_FLAG(BTIME); + +#undef P_FLAG + + if (flags) + printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags); + + return printed; +}