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linux/tools/perf/builtin-trace.c
Arnaldo Carvalho de Melo 88cf7084f9 perf trace: Wire up the augmented syscalls with the syscalls:sys_enter_FOO beautifier 
We just check that the evsel is the one we associated with the
bpf-output event associated with the "__augmented_syscalls__" eBPF map,
to show that the formatting is done properly:

  # perf trace -e perf/tools/perf/examples/bpf/augmented_syscalls.c,openat cat /etc/passwd > /dev/null
     0.000 (         ): __augmented_syscalls__:dfd: CWD, filename: 0x43e06da8, flags: CLOEXEC
     0.006 (         ): syscalls:sys_enter_openat:dfd: CWD, filename: 0x43e06da8, flags: CLOEXEC
     0.007 ( 0.004 ms): cat/11486 openat(dfd: CWD, filename: 0x43e06da8, flags: CLOEXEC                 ) = 3
     0.029 (         ): __augmented_syscalls__:dfd: CWD, filename: 0x4400ece0, flags: CLOEXEC
     0.030 (         ): syscalls:sys_enter_openat:dfd: CWD, filename: 0x4400ece0, flags: CLOEXEC
     0.031 ( 0.004 ms): cat/11486 openat(dfd: CWD, filename: 0x4400ece0, flags: CLOEXEC                 ) = 3
     0.249 (         ): __augmented_syscalls__:dfd: CWD, filename: 0xc3700d6
     0.250 (         ): syscalls:sys_enter_openat:dfd: CWD, filename: 0xc3700d6
     0.252 ( 0.003 ms): cat/11486 openat(dfd: CWD, filename: 0xc3700d6                                  ) = 3
  #

Now we just need to get the full blown enter/exit handlers to check if the
evsel being processed is the augmented_syscalls one to go pick the pointer
payloads from the end of the payload.

We also need to state somehow what is the layout for multi pointer arg syscalls.

Also handy would be to have a BTF file with the struct definitions used in
syscalls, compact, generated at kernel built time and available for use in eBPF
programs.

Till we get there we can go on doing some manual coupling of the most relevant
syscalls with some hand built beautifiers.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-r6ba5izrml82nwfmwcp7jpkm@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-08-08 15:55:59 -03:00

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/*
* builtin-trace.c
*
* Builtin 'trace' command:
*
* Display a continuously updated trace of any workload, CPU, specific PID,
* system wide, etc. Default format is loosely strace like, but any other
* event may be specified using --event.
*
* Copyright (C) 2012, 2013, 2014, 2015 Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
*
* Initially based on the 'trace' prototype by Thomas Gleixner:
*
* http://lwn.net/Articles/415728/ ("Announcing a new utility: 'trace'")
*
* Released under the GPL v2. (and only v2, not any later version)
*/
#include <traceevent/event-parse.h>
#include <api/fs/tracing_path.h>
#include "builtin.h"
#include "util/cgroup.h"
#include "util/color.h"
#include "util/debug.h"
#include "util/env.h"
#include "util/event.h"
#include "util/evlist.h"
#include <subcmd/exec-cmd.h>
#include "util/machine.h"
#include "util/path.h"
#include "util/session.h"
#include "util/thread.h"
#include <subcmd/parse-options.h>
#include "util/strlist.h"
#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"
#include "callchain.h"
#include "print_binary.h"
#include "string2.h"
#include "syscalltbl.h"
#include "rb_resort.h"
#include <errno.h>
#include <inttypes.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <linux/err.h>
#include <linux/filter.h>
#include <linux/kernel.h>
#include <linux/random.h>
#include <linux/stringify.h>
#include <linux/time64.h>
#include <fcntl.h>
#include "sane_ctype.h"
#ifndef O_CLOEXEC
# define O_CLOEXEC 02000000
#endif
#ifndef F_LINUX_SPECIFIC_BASE
# define F_LINUX_SPECIFIC_BASE 1024
#endif
struct trace {
struct perf_tool tool;
struct syscalltbl *sctbl;
struct {
int max;
struct syscall *table;
struct {
struct perf_evsel *sys_enter,
*sys_exit,
*augmented;
} events;
} syscalls;
struct record_opts opts;
struct perf_evlist *evlist;
struct machine *host;
struct thread *current;
struct cgroup *cgroup;
u64 base_time;
FILE *output;
unsigned long nr_events;
struct strlist *ev_qualifier;
struct {
size_t nr;
int *entries;
} ev_qualifier_ids;
struct {
size_t nr;
pid_t *entries;
} filter_pids;
double duration_filter;
double runtime_ms;
struct {
u64 vfs_getname,
proc_getname;
} stats;
unsigned int max_stack;
unsigned int min_stack;
bool not_ev_qualifier;
bool live;
bool full_time;
bool sched;
bool multiple_threads;
bool summary;
bool summary_only;
bool failure_only;
bool show_comm;
bool print_sample;
bool show_tool_stats;
bool trace_syscalls;
bool kernel_syscallchains;
bool force;
bool vfs_getname;
int trace_pgfaults;
};
struct tp_field {
int offset;
union {
u64 (*integer)(struct tp_field *field, struct perf_sample *sample);
void *(*pointer)(struct tp_field *field, struct perf_sample *sample);
};
};
#define TP_UINT_FIELD(bits) \
static u64 tp_field__u##bits(struct tp_field *field, struct perf_sample *sample) \
{ \
u##bits value; \
memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
return value; \
}
TP_UINT_FIELD(8);
TP_UINT_FIELD(16);
TP_UINT_FIELD(32);
TP_UINT_FIELD(64);
#define TP_UINT_FIELD__SWAPPED(bits) \
static u64 tp_field__swapped_u##bits(struct tp_field *field, struct perf_sample *sample) \
{ \
u##bits value; \
memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
return bswap_##bits(value);\
}
TP_UINT_FIELD__SWAPPED(16);
TP_UINT_FIELD__SWAPPED(32);
TP_UINT_FIELD__SWAPPED(64);
static int __tp_field__init_uint(struct tp_field *field, int size, int offset, bool needs_swap)
{
field->offset = offset;
switch (size) {
case 1:
field->integer = tp_field__u8;
break;
case 2:
field->integer = needs_swap ? tp_field__swapped_u16 : tp_field__u16;
break;
case 4:
field->integer = needs_swap ? tp_field__swapped_u32 : tp_field__u32;
break;
case 8:
field->integer = needs_swap ? tp_field__swapped_u64 : tp_field__u64;
break;
default:
return -1;
}
return 0;
}
static int tp_field__init_uint(struct tp_field *field, struct format_field *format_field, bool needs_swap)
{
return __tp_field__init_uint(field, format_field->size, format_field->offset, needs_swap);
}
static void *tp_field__ptr(struct tp_field *field, struct perf_sample *sample)
{
return sample->raw_data + field->offset;
}
static int __tp_field__init_ptr(struct tp_field *field, int offset)
{
field->offset = offset;
field->pointer = tp_field__ptr;
return 0;
}
static int tp_field__init_ptr(struct tp_field *field, struct format_field *format_field)
{
return __tp_field__init_ptr(field, format_field->offset);
}
struct syscall_tp {
struct tp_field id;
union {
struct tp_field args, ret;
};
};
static int perf_evsel__init_tp_uint_field(struct perf_evsel *evsel,
struct tp_field *field,
const char *name)
{
struct format_field *format_field = perf_evsel__field(evsel, name);
if (format_field == NULL)
return -1;
return tp_field__init_uint(field, format_field, evsel->needs_swap);
}
#define perf_evsel__init_sc_tp_uint_field(evsel, name) \
({ struct syscall_tp *sc = evsel->priv;\
perf_evsel__init_tp_uint_field(evsel, &sc->name, #name); })
static int perf_evsel__init_tp_ptr_field(struct perf_evsel *evsel,
struct tp_field *field,
const char *name)
{
struct format_field *format_field = perf_evsel__field(evsel, name);
if (format_field == NULL)
return -1;
return tp_field__init_ptr(field, format_field);
}
#define perf_evsel__init_sc_tp_ptr_field(evsel, name) \
({ struct syscall_tp *sc = evsel->priv;\
perf_evsel__init_tp_ptr_field(evsel, &sc->name, #name); })
static void perf_evsel__delete_priv(struct perf_evsel *evsel)
{
zfree(&evsel->priv);
perf_evsel__delete(evsel);
}
static int perf_evsel__init_syscall_tp(struct perf_evsel *evsel)
{
struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp));
if (evsel->priv != NULL) {
if (perf_evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr"))
goto out_delete;
return 0;
}
return -ENOMEM;
out_delete:
zfree(&evsel->priv);
return -ENOENT;
}
static int perf_evsel__init_augmented_syscall_tp(struct perf_evsel *evsel)
{
struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp));
if (evsel->priv != NULL) { /* field, sizeof_field, offsetof_field */
if (__tp_field__init_uint(&sc->id, sizeof(long), sizeof(long long), evsel->needs_swap))
goto out_delete;
return 0;
}
return -ENOMEM;
out_delete:
zfree(&evsel->priv);
return -EINVAL;
}
static int perf_evsel__init_augmented_syscall_tp_args(struct perf_evsel *evsel)
{
struct syscall_tp *sc = evsel->priv;
return __tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64));
}
static int perf_evsel__init_raw_syscall_tp(struct perf_evsel *evsel, void *handler)
{
evsel->priv = malloc(sizeof(struct syscall_tp));
if (evsel->priv != NULL) {
if (perf_evsel__init_sc_tp_uint_field(evsel, id))
goto out_delete;
evsel->handler = handler;
return 0;
}
return -ENOMEM;
out_delete:
zfree(&evsel->priv);
return -ENOENT;
}
static struct perf_evsel *perf_evsel__raw_syscall_newtp(const char *direction, void *handler)
{
struct perf_evsel *evsel = perf_evsel__newtp("raw_syscalls", direction);
/* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */
if (IS_ERR(evsel))
evsel = perf_evsel__newtp("syscalls", direction);
if (IS_ERR(evsel))
return NULL;
if (perf_evsel__init_raw_syscall_tp(evsel, handler))
goto out_delete;
return evsel;
out_delete:
perf_evsel__delete_priv(evsel);
return NULL;
}
#define perf_evsel__sc_tp_uint(evsel, name, sample) \
({ struct syscall_tp *fields = evsel->priv; \
fields->name.integer(&fields->name, sample); })
#define perf_evsel__sc_tp_ptr(evsel, name, sample) \
({ struct syscall_tp *fields = evsel->priv; \
fields->name.pointer(&fields->name, sample); })
size_t strarray__scnprintf(struct strarray *sa, char *bf, size_t size, const char *intfmt, int val)
{
int idx = val - sa->offset;
if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL)
return scnprintf(bf, size, intfmt, val);
return scnprintf(bf, size, "%s", sa->entries[idx]);
}
static size_t __syscall_arg__scnprintf_strarray(char *bf, size_t size,
const char *intfmt,
struct syscall_arg *arg)
{
return strarray__scnprintf(arg->parm, bf, size, intfmt, arg->val);
}
static size_t syscall_arg__scnprintf_strarray(char *bf, size_t size,
struct syscall_arg *arg)
{
return __syscall_arg__scnprintf_strarray(bf, size, "%d", arg);
}
#define SCA_STRARRAY syscall_arg__scnprintf_strarray
struct strarrays {
int nr_entries;
struct strarray **entries;
};
#define DEFINE_STRARRAYS(array) struct strarrays strarrays__##array = { \
.nr_entries = ARRAY_SIZE(array), \
.entries = array, \
}
size_t syscall_arg__scnprintf_strarrays(char *bf, size_t size,
struct syscall_arg *arg)
{
struct strarrays *sas = arg->parm;
int i;
for (i = 0; i < sas->nr_entries; ++i) {
struct strarray *sa = sas->entries[i];
int idx = arg->val - sa->offset;
if (idx >= 0 && idx < sa->nr_entries) {
if (sa->entries[idx] == NULL)
break;
return scnprintf(bf, size, "%s", sa->entries[idx]);
}
}
return scnprintf(bf, size, "%d", arg->val);
}
#ifndef AT_FDCWD
#define AT_FDCWD -100
#endif
static size_t syscall_arg__scnprintf_fd_at(char *bf, size_t size,
struct syscall_arg *arg)
{
int fd = arg->val;
if (fd == AT_FDCWD)
return scnprintf(bf, size, "CWD");
return syscall_arg__scnprintf_fd(bf, size, arg);
}
#define SCA_FDAT syscall_arg__scnprintf_fd_at
static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
struct syscall_arg *arg);
#define SCA_CLOSE_FD syscall_arg__scnprintf_close_fd
size_t syscall_arg__scnprintf_hex(char *bf, size_t size, struct syscall_arg *arg)
{
return scnprintf(bf, size, "%#lx", arg->val);
}
size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_arg *arg)
{
return scnprintf(bf, size, "%d", arg->val);
}
size_t syscall_arg__scnprintf_long(char *bf, size_t size, struct syscall_arg *arg)
{
return scnprintf(bf, size, "%ld", arg->val);
}
static const char *bpf_cmd[] = {
"MAP_CREATE", "MAP_LOOKUP_ELEM", "MAP_UPDATE_ELEM", "MAP_DELETE_ELEM",
"MAP_GET_NEXT_KEY", "PROG_LOAD",
};
static DEFINE_STRARRAY(bpf_cmd);
static const char *epoll_ctl_ops[] = { "ADD", "DEL", "MOD", };
static DEFINE_STRARRAY_OFFSET(epoll_ctl_ops, 1);
static const char *itimers[] = { "REAL", "VIRTUAL", "PROF", };
static DEFINE_STRARRAY(itimers);
static const char *keyctl_options[] = {
"GET_KEYRING_ID", "JOIN_SESSION_KEYRING", "UPDATE", "REVOKE", "CHOWN",
"SETPERM", "DESCRIBE", "CLEAR", "LINK", "UNLINK", "SEARCH", "READ",
"INSTANTIATE", "NEGATE", "SET_REQKEY_KEYRING", "SET_TIMEOUT",
"ASSUME_AUTHORITY", "GET_SECURITY", "SESSION_TO_PARENT", "REJECT",
"INSTANTIATE_IOV", "INVALIDATE", "GET_PERSISTENT",
};
static DEFINE_STRARRAY(keyctl_options);
static const char *whences[] = { "SET", "CUR", "END",
#ifdef SEEK_DATA
"DATA",
#endif
#ifdef SEEK_HOLE
"HOLE",
#endif
};
static DEFINE_STRARRAY(whences);
static const char *fcntl_cmds[] = {
"DUPFD", "GETFD", "SETFD", "GETFL", "SETFL", "GETLK", "SETLK",
"SETLKW", "SETOWN", "GETOWN", "SETSIG", "GETSIG", "GETLK64",
"SETLK64", "SETLKW64", "SETOWN_EX", "GETOWN_EX",
"GETOWNER_UIDS",
};
static DEFINE_STRARRAY(fcntl_cmds);
static const char *fcntl_linux_specific_cmds[] = {
"SETLEASE", "GETLEASE", "NOTIFY", [5] = "CANCELLK", "DUPFD_CLOEXEC",
"SETPIPE_SZ", "GETPIPE_SZ", "ADD_SEALS", "GET_SEALS",
"GET_RW_HINT", "SET_RW_HINT", "GET_FILE_RW_HINT", "SET_FILE_RW_HINT",
};
static DEFINE_STRARRAY_OFFSET(fcntl_linux_specific_cmds, F_LINUX_SPECIFIC_BASE);
static struct strarray *fcntl_cmds_arrays[] = {
&strarray__fcntl_cmds,
&strarray__fcntl_linux_specific_cmds,
};
static DEFINE_STRARRAYS(fcntl_cmds_arrays);
static const char *rlimit_resources[] = {
"CPU", "FSIZE", "DATA", "STACK", "CORE", "RSS", "NPROC", "NOFILE",
"MEMLOCK", "AS", "LOCKS", "SIGPENDING", "MSGQUEUE", "NICE", "RTPRIO",
"RTTIME",
};
static DEFINE_STRARRAY(rlimit_resources);
static const char *sighow[] = { "BLOCK", "UNBLOCK", "SETMASK", };
static DEFINE_STRARRAY(sighow);
static const char *clockid[] = {
"REALTIME", "MONOTONIC", "PROCESS_CPUTIME_ID", "THREAD_CPUTIME_ID",
"MONOTONIC_RAW", "REALTIME_COARSE", "MONOTONIC_COARSE", "BOOTTIME",
"REALTIME_ALARM", "BOOTTIME_ALARM", "SGI_CYCLE", "TAI"
};
static DEFINE_STRARRAY(clockid);
static const char *socket_families[] = {
"UNSPEC", "LOCAL", "INET", "AX25", "IPX", "APPLETALK", "NETROM",
"BRIDGE", "ATMPVC", "X25", "INET6", "ROSE", "DECnet", "NETBEUI",
"SECURITY", "KEY", "NETLINK", "PACKET", "ASH", "ECONET", "ATMSVC",
"RDS", "SNA", "IRDA", "PPPOX", "WANPIPE", "LLC", "IB", "CAN", "TIPC",
"BLUETOOTH", "IUCV", "RXRPC", "ISDN", "PHONET", "IEEE802154", "CAIF",
"ALG", "NFC", "VSOCK",
};
static DEFINE_STRARRAY(socket_families);
static size_t syscall_arg__scnprintf_access_mode(char *bf, size_t size,
struct syscall_arg *arg)
{
size_t printed = 0;
int mode = arg->val;
if (mode == F_OK) /* 0 */
return scnprintf(bf, size, "F");
#define P_MODE(n) \
if (mode & n##_OK) { \
printed += scnprintf(bf + printed, size - printed, "%s", #n); \
mode &= ~n##_OK; \
}
P_MODE(R);
P_MODE(W);
P_MODE(X);
#undef P_MODE
if (mode)
printed += scnprintf(bf + printed, size - printed, "|%#x", mode);
return printed;
}
#define SCA_ACCMODE syscall_arg__scnprintf_access_mode
static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
struct syscall_arg *arg);
#define SCA_FILENAME syscall_arg__scnprintf_filename
static size_t syscall_arg__scnprintf_pipe_flags(char *bf, size_t size,
struct syscall_arg *arg)
{
int printed = 0, flags = arg->val;
#define P_FLAG(n) \
if (flags & O_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
flags &= ~O_##n; \
}
P_FLAG(CLOEXEC);
P_FLAG(NONBLOCK);
#undef P_FLAG
if (flags)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
return printed;
}
#define SCA_PIPE_FLAGS syscall_arg__scnprintf_pipe_flags
#ifndef GRND_NONBLOCK
#define GRND_NONBLOCK 0x0001
#endif
#ifndef GRND_RANDOM
#define GRND_RANDOM 0x0002
#endif
static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,
struct syscall_arg *arg)
{
int printed = 0, flags = arg->val;
#define P_FLAG(n) \
if (flags & GRND_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
flags &= ~GRND_##n; \
}
P_FLAG(RANDOM);
P_FLAG(NONBLOCK);
#undef P_FLAG
if (flags)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
return printed;
}
#define SCA_GETRANDOM_FLAGS syscall_arg__scnprintf_getrandom_flags
#define STRARRAY(name, array) \
{ .scnprintf = SCA_STRARRAY, \
.parm = &strarray__##array, }
#include "trace/beauty/arch_errno_names.c"
#include "trace/beauty/eventfd.c"
#include "trace/beauty/futex_op.c"
#include "trace/beauty/futex_val3.c"
#include "trace/beauty/mmap.c"
#include "trace/beauty/mode_t.c"
#include "trace/beauty/msg_flags.c"
#include "trace/beauty/open_flags.c"
#include "trace/beauty/perf_event_open.c"
#include "trace/beauty/pid.c"
#include "trace/beauty/sched_policy.c"
#include "trace/beauty/seccomp.c"
#include "trace/beauty/signum.c"
#include "trace/beauty/socket_type.c"
#include "trace/beauty/waitid_options.c"
struct syscall_arg_fmt {
size_t (*scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
void *parm;
const char *name;
bool show_zero;
};
static struct syscall_fmt {
const char *name;
const char *alias;
struct syscall_arg_fmt arg[6];
u8 nr_args;
bool errpid;
bool timeout;
bool hexret;
} syscall_fmts[] = {
{ .name = "access",
.arg = { [1] = { .scnprintf = SCA_ACCMODE, /* mode */ }, }, },
{ .name = "bpf",
.arg = { [0] = STRARRAY(cmd, bpf_cmd), }, },
{ .name = "brk", .hexret = true,
.arg = { [0] = { .scnprintf = SCA_HEX, /* brk */ }, }, },
{ .name = "clock_gettime",
.arg = { [0] = STRARRAY(clk_id, clockid), }, },
{ .name = "clone", .errpid = true, .nr_args = 5,
.arg = { [0] = { .name = "flags", .scnprintf = SCA_CLONE_FLAGS, },
[1] = { .name = "child_stack", .scnprintf = SCA_HEX, },
[2] = { .name = "parent_tidptr", .scnprintf = SCA_HEX, },
[3] = { .name = "child_tidptr", .scnprintf = SCA_HEX, },
[4] = { .name = "tls", .scnprintf = SCA_HEX, }, }, },
{ .name = "close",
.arg = { [0] = { .scnprintf = SCA_CLOSE_FD, /* fd */ }, }, },
{ .name = "epoll_ctl",
.arg = { [1] = STRARRAY(op, epoll_ctl_ops), }, },
{ .name = "eventfd2",
.arg = { [1] = { .scnprintf = SCA_EFD_FLAGS, /* flags */ }, }, },
{ .name = "fchmodat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "fchownat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "fcntl",
.arg = { [1] = { .scnprintf = SCA_FCNTL_CMD, /* cmd */
.parm = &strarrays__fcntl_cmds_arrays,
.show_zero = true, },
[2] = { .scnprintf = SCA_FCNTL_ARG, /* arg */ }, }, },
{ .name = "flock",
.arg = { [1] = { .scnprintf = SCA_FLOCK, /* cmd */ }, }, },
{ .name = "fstat", .alias = "newfstat", },
{ .name = "fstatat", .alias = "newfstatat", },
{ .name = "futex",
.arg = { [1] = { .scnprintf = SCA_FUTEX_OP, /* op */ },
[5] = { .scnprintf = SCA_FUTEX_VAL3, /* val3 */ }, }, },
{ .name = "futimesat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "getitimer",
.arg = { [0] = STRARRAY(which, itimers), }, },
{ .name = "getpid", .errpid = true, },
{ .name = "getpgid", .errpid = true, },
{ .name = "getppid", .errpid = true, },
{ .name = "getrandom",
.arg = { [2] = { .scnprintf = SCA_GETRANDOM_FLAGS, /* flags */ }, }, },
{ .name = "getrlimit",
.arg = { [0] = STRARRAY(resource, rlimit_resources), }, },
{ .name = "gettid", .errpid = true, },
{ .name = "ioctl",
.arg = {
#if defined(__i386__) || defined(__x86_64__)
/*
* FIXME: Make this available to all arches.
*/
[1] = { .scnprintf = SCA_IOCTL_CMD, /* cmd */ },
[2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
#else
[2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
#endif
{ .name = "kcmp", .nr_args = 5,
.arg = { [0] = { .name = "pid1", .scnprintf = SCA_PID, },
[1] = { .name = "pid2", .scnprintf = SCA_PID, },
[2] = { .name = "type", .scnprintf = SCA_KCMP_TYPE, },
[3] = { .name = "idx1", .scnprintf = SCA_KCMP_IDX, },
[4] = { .name = "idx2", .scnprintf = SCA_KCMP_IDX, }, }, },
{ .name = "keyctl",
.arg = { [0] = STRARRAY(option, keyctl_options), }, },
{ .name = "kill",
.arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "linkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "lseek",
.arg = { [2] = STRARRAY(whence, whences), }, },
{ .name = "lstat", .alias = "newlstat", },
{ .name = "madvise",
.arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },
[2] = { .scnprintf = SCA_MADV_BHV, /* behavior */ }, }, },
{ .name = "mkdirat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "mknodat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "mlock",
.arg = { [0] = { .scnprintf = SCA_HEX, /* addr */ }, }, },
{ .name = "mlockall",
.arg = { [0] = { .scnprintf = SCA_HEX, /* addr */ }, }, },
{ .name = "mmap", .hexret = true,
/* The standard mmap maps to old_mmap on s390x */
#if defined(__s390x__)
.alias = "old_mmap",
#endif
.arg = { [0] = { .scnprintf = SCA_HEX, /* addr */ },
[2] = { .scnprintf = SCA_MMAP_PROT, /* prot */ },
[3] = { .scnprintf = SCA_MMAP_FLAGS, /* flags */ }, }, },
{ .name = "mprotect",
.arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },
[2] = { .scnprintf = SCA_MMAP_PROT, /* prot */ }, }, },
{ .name = "mq_unlink",
.arg = { [0] = { .scnprintf = SCA_FILENAME, /* u_name */ }, }, },
{ .name = "mremap", .hexret = true,
.arg = { [0] = { .scnprintf = SCA_HEX, /* addr */ },
[3] = { .scnprintf = SCA_MREMAP_FLAGS, /* flags */ },
[4] = { .scnprintf = SCA_HEX, /* new_addr */ }, }, },
{ .name = "munlock",
.arg = { [0] = { .scnprintf = SCA_HEX, /* addr */ }, }, },
{ .name = "munmap",
.arg = { [0] = { .scnprintf = SCA_HEX, /* addr */ }, }, },
{ .name = "name_to_handle_at",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "newfstatat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "open",
.arg = { [1] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
{ .name = "open_by_handle_at",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },
[2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
{ .name = "openat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },
[2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
{ .name = "perf_event_open",
.arg = { [2] = { .scnprintf = SCA_INT, /* cpu */ },
[3] = { .scnprintf = SCA_FD, /* group_fd */ },
[4] = { .scnprintf = SCA_PERF_FLAGS, /* flags */ }, }, },
{ .name = "pipe2",
.arg = { [1] = { .scnprintf = SCA_PIPE_FLAGS, /* flags */ }, }, },
{ .name = "pkey_alloc",
.arg = { [1] = { .scnprintf = SCA_PKEY_ALLOC_ACCESS_RIGHTS, /* access_rights */ }, }, },
{ .name = "pkey_free",
.arg = { [0] = { .scnprintf = SCA_INT, /* key */ }, }, },
{ .name = "pkey_mprotect",
.arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },
[2] = { .scnprintf = SCA_MMAP_PROT, /* prot */ },
[3] = { .scnprintf = SCA_INT, /* pkey */ }, }, },
{ .name = "poll", .timeout = true, },
{ .name = "ppoll", .timeout = true, },
{ .name = "prctl", .alias = "arch_prctl",
.arg = { [0] = { .scnprintf = SCA_PRCTL_OPTION, /* option */ },
[1] = { .scnprintf = SCA_PRCTL_ARG2, /* arg2 */ },
[2] = { .scnprintf = SCA_PRCTL_ARG3, /* arg3 */ }, }, },
{ .name = "pread", .alias = "pread64", },
{ .name = "preadv", .alias = "pread", },
{ .name = "prlimit64",
.arg = { [1] = STRARRAY(resource, rlimit_resources), }, },
{ .name = "pwrite", .alias = "pwrite64", },
{ .name = "readlinkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "recvfrom",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "recvmmsg",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "recvmsg",
.arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "renameat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "rt_sigaction",
.arg = { [0] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "rt_sigprocmask",
.arg = { [0] = STRARRAY(how, sighow), }, },
{ .name = "rt_sigqueueinfo",
.arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "rt_tgsigqueueinfo",
.arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "sched_setscheduler",
.arg = { [1] = { .scnprintf = SCA_SCHED_POLICY, /* policy */ }, }, },
{ .name = "seccomp",
.arg = { [0] = { .scnprintf = SCA_SECCOMP_OP, /* op */ },
[1] = { .scnprintf = SCA_SECCOMP_FLAGS, /* flags */ }, }, },
{ .name = "select", .timeout = true, },
{ .name = "sendmmsg",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "sendmsg",
.arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "sendto",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "set_tid_address", .errpid = true, },
{ .name = "setitimer",
.arg = { [0] = STRARRAY(which, itimers), }, },
{ .name = "setrlimit",
.arg = { [0] = STRARRAY(resource, rlimit_resources), }, },
{ .name = "socket",
.arg = { [0] = STRARRAY(family, socket_families),
[1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
[2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
{ .name = "socketpair",
.arg = { [0] = STRARRAY(family, socket_families),
[1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
[2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
{ .name = "stat", .alias = "newstat", },
{ .name = "statx",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fdat */ },
[2] = { .scnprintf = SCA_STATX_FLAGS, /* flags */ } ,
[3] = { .scnprintf = SCA_STATX_MASK, /* mask */ }, }, },
{ .name = "swapoff",
.arg = { [0] = { .scnprintf = SCA_FILENAME, /* specialfile */ }, }, },
{ .name = "swapon",
.arg = { [0] = { .scnprintf = SCA_FILENAME, /* specialfile */ }, }, },
{ .name = "symlinkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "tgkill",
.arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "tkill",
.arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "uname", .alias = "newuname", },
{ .name = "unlinkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "utimensat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ }, }, },
{ .name = "wait4", .errpid = true,
.arg = { [2] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
{ .name = "waitid", .errpid = true,
.arg = { [3] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
};
static int syscall_fmt__cmp(const void *name, const void *fmtp)
{
const struct syscall_fmt *fmt = fmtp;
return strcmp(name, fmt->name);
}
static struct syscall_fmt *syscall_fmt__find(const char *name)
{
const int nmemb = ARRAY_SIZE(syscall_fmts);
return bsearch(name, syscall_fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
}
/*
* is_exit: is this "exit" or "exit_group"?
* is_open: is this "open" or "openat"? To associate the fd returned in sys_exit with the pathname in sys_enter.
*/
struct syscall {
struct event_format *tp_format;
int nr_args;
bool is_exit;
bool is_open;
struct format_field *args;
const char *name;
struct syscall_fmt *fmt;
struct syscall_arg_fmt *arg_fmt;
};
/*
* We need to have this 'calculated' boolean because in some cases we really
* don't know what is the duration of a syscall, for instance, when we start
* a session and some threads are waiting for a syscall to finish, say 'poll',
* in which case all we can do is to print "( ? ) for duration and for the
* start timestamp.
*/
static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp)
{
double duration = (double)t / NSEC_PER_MSEC;
size_t printed = fprintf(fp, "(");
if (!calculated)
printed += fprintf(fp, " ");
else if (duration >= 1.0)
printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration);
else if (duration >= 0.01)
printed += color_fprintf(fp, PERF_COLOR_YELLOW, "%6.3f ms", duration);
else
printed += color_fprintf(fp, PERF_COLOR_NORMAL, "%6.3f ms", duration);
return printed + fprintf(fp, "): ");
}
/**
* filename.ptr: The filename char pointer that will be vfs_getname'd
* filename.entry_str_pos: Where to insert the string translated from
* filename.ptr by the vfs_getname tracepoint/kprobe.
* ret_scnprintf: syscall args may set this to a different syscall return
* formatter, for instance, fcntl may return fds, file flags, etc.
*/
struct thread_trace {
u64 entry_time;
bool entry_pending;
unsigned long nr_events;
unsigned long pfmaj, pfmin;
char *entry_str;
double runtime_ms;
size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
struct {
unsigned long ptr;
short int entry_str_pos;
bool pending_open;
unsigned int namelen;
char *name;
} filename;
struct {
int max;
char **table;
} paths;
struct intlist *syscall_stats;
};
static struct thread_trace *thread_trace__new(void)
{
struct thread_trace *ttrace = zalloc(sizeof(struct thread_trace));
if (ttrace)
ttrace->paths.max = -1;
ttrace->syscall_stats = intlist__new(NULL);
return ttrace;
}
static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
{
struct thread_trace *ttrace;
if (thread == NULL)
goto fail;
if (thread__priv(thread) == NULL)
thread__set_priv(thread, thread_trace__new());
if (thread__priv(thread) == NULL)
goto fail;
ttrace = thread__priv(thread);
++ttrace->nr_events;
return ttrace;
fail:
color_fprintf(fp, PERF_COLOR_RED,
"WARNING: not enough memory, dropping samples!\n");
return NULL;
}
void syscall_arg__set_ret_scnprintf(struct syscall_arg *arg,
size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg))
{
struct thread_trace *ttrace = thread__priv(arg->thread);
ttrace->ret_scnprintf = ret_scnprintf;
}
#define TRACE_PFMAJ (1 << 0)
#define TRACE_PFMIN (1 << 1)
static const size_t trace__entry_str_size = 2048;
static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pathname)
{
struct thread_trace *ttrace = thread__priv(thread);
if (fd > ttrace->paths.max) {
char **npath = realloc(ttrace->paths.table, (fd + 1) * sizeof(char *));
if (npath == NULL)
return -1;
if (ttrace->paths.max != -1) {
memset(npath + ttrace->paths.max + 1, 0,
(fd - ttrace->paths.max) * sizeof(char *));
} else {
memset(npath, 0, (fd + 1) * sizeof(char *));
}
ttrace->paths.table = npath;
ttrace->paths.max = fd;
}
ttrace->paths.table[fd] = strdup(pathname);
return ttrace->paths.table[fd] != NULL ? 0 : -1;
}
static int thread__read_fd_path(struct thread *thread, int fd)
{
char linkname[PATH_MAX], pathname[PATH_MAX];
struct stat st;
int ret;
if (thread->pid_ == thread->tid) {
scnprintf(linkname, sizeof(linkname),
"/proc/%d/fd/%d", thread->pid_, fd);
} else {
scnprintf(linkname, sizeof(linkname),
"/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
}
if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
return -1;
ret = readlink(linkname, pathname, sizeof(pathname));
if (ret < 0 || ret > st.st_size)
return -1;
pathname[ret] = '\0';
return trace__set_fd_pathname(thread, fd, pathname);
}
static const char *thread__fd_path(struct thread *thread, int fd,
struct trace *trace)
{
struct thread_trace *ttrace = thread__priv(thread);
if (ttrace == NULL)
return NULL;
if (fd < 0)
return NULL;
if ((fd > ttrace->paths.max || ttrace->paths.table[fd] == NULL)) {
if (!trace->live)
return NULL;
++trace->stats.proc_getname;
if (thread__read_fd_path(thread, fd))
return NULL;
}
return ttrace->paths.table[fd];
}
size_t syscall_arg__scnprintf_fd(char *bf, size_t size, struct syscall_arg *arg)
{
int fd = arg->val;
size_t printed = scnprintf(bf, size, "%d", fd);
const char *path = thread__fd_path(arg->thread, fd, arg->trace);
if (path)
printed += scnprintf(bf + printed, size - printed, "<%s>", path);
return printed;
}
size_t pid__scnprintf_fd(struct trace *trace, pid_t pid, int fd, char *bf, size_t size)
{
size_t printed = scnprintf(bf, size, "%d", fd);
struct thread *thread = machine__find_thread(trace->host, pid, pid);
if (thread) {
const char *path = thread__fd_path(thread, fd, trace);
if (path)
printed += scnprintf(bf + printed, size - printed, "<%s>", path);
thread__put(thread);
}
return printed;
}
static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
struct syscall_arg *arg)
{
int fd = arg->val;
size_t printed = syscall_arg__scnprintf_fd(bf, size, arg);
struct thread_trace *ttrace = thread__priv(arg->thread);
if (ttrace && fd >= 0 && fd <= ttrace->paths.max)
zfree(&ttrace->paths.table[fd]);
return printed;
}
static void thread__set_filename_pos(struct thread *thread, const char *bf,
unsigned long ptr)
{
struct thread_trace *ttrace = thread__priv(thread);
ttrace->filename.ptr = ptr;
ttrace->filename.entry_str_pos = bf - ttrace->entry_str;
}
static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
struct syscall_arg *arg)
{
unsigned long ptr = arg->val;
if (!arg->trace->vfs_getname)
return scnprintf(bf, size, "%#x", ptr);
thread__set_filename_pos(arg->thread, bf, ptr);
return 0;
}
static bool trace__filter_duration(struct trace *trace, double t)
{
return t < (trace->duration_filter * NSEC_PER_MSEC);
}
static size_t __trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
{
double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
return fprintf(fp, "%10.3f ", ts);
}
/*
* We're handling tstamp=0 as an undefined tstamp, i.e. like when we are
* using ttrace->entry_time for a thread that receives a sys_exit without
* first having received a sys_enter ("poll" issued before tracing session
* starts, lost sys_enter exit due to ring buffer overflow).
*/
static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
{
if (tstamp > 0)
return __trace__fprintf_tstamp(trace, tstamp, fp);
return fprintf(fp, " ? ");
}
static bool done = false;
static bool interrupted = false;
static void sig_handler(int sig)
{
done = true;
interrupted = sig == SIGINT;
}
static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
u64 duration, bool duration_calculated, u64 tstamp, FILE *fp)
{
size_t printed = trace__fprintf_tstamp(trace, tstamp, fp);
printed += fprintf_duration(duration, duration_calculated, fp);
if (trace->multiple_threads) {
if (trace->show_comm)
printed += fprintf(fp, "%.14s/", thread__comm_str(thread));
printed += fprintf(fp, "%d ", thread->tid);
}
return printed;
}
static int trace__process_event(struct trace *trace, struct machine *machine,
union perf_event *event, struct perf_sample *sample)
{
int ret = 0;
switch (event->header.type) {
case PERF_RECORD_LOST:
color_fprintf(trace->output, PERF_COLOR_RED,
"LOST %" PRIu64 " events!\n", event->lost.lost);
ret = machine__process_lost_event(machine, event, sample);
break;
default:
ret = machine__process_event(machine, event, sample);
break;
}
return ret;
}
static int trace__tool_process(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct trace *trace = container_of(tool, struct trace, tool);
return trace__process_event(trace, machine, event, sample);
}
static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
{
struct machine *machine = vmachine;
if (machine->kptr_restrict_warned)
return NULL;
if (symbol_conf.kptr_restrict) {
pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict.\n\n"
"Kernel samples will not be resolved.\n");
machine->kptr_restrict_warned = true;
return NULL;
}
return machine__resolve_kernel_addr(vmachine, addrp, modp);
}
static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
{
int err = symbol__init(NULL);
if (err)
return err;
trace->host = machine__new_host();
if (trace->host == NULL)
return -ENOMEM;
err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);
if (err < 0)
goto out;
err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
evlist->threads, trace__tool_process, false,
trace->opts.proc_map_timeout, 1);
out:
if (err)
symbol__exit();
return err;
}
static void trace__symbols__exit(struct trace *trace)
{
machine__exit(trace->host);
trace->host = NULL;
symbol__exit();
}
static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
{
int idx;
if (nr_args == 6 && sc->fmt && sc->fmt->nr_args != 0)
nr_args = sc->fmt->nr_args;
sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));
if (sc->arg_fmt == NULL)
return -1;
for (idx = 0; idx < nr_args; ++idx) {
if (sc->fmt)
sc->arg_fmt[idx] = sc->fmt->arg[idx];
}
sc->nr_args = nr_args;
return 0;
}
static int syscall__set_arg_fmts(struct syscall *sc)
{
struct format_field *field;
int idx = 0, len;
for (field = sc->args; field; field = field->next, ++idx) {
if (sc->fmt && sc->fmt->arg[idx].scnprintf)
continue;
if (strcmp(field->type, "const char *") == 0 &&
(strcmp(field->name, "filename") == 0 ||
strcmp(field->name, "path") == 0 ||
strcmp(field->name, "pathname") == 0))
sc->arg_fmt[idx].scnprintf = SCA_FILENAME;
else if (field->flags & FIELD_IS_POINTER)
sc->arg_fmt[idx].scnprintf = syscall_arg__scnprintf_hex;
else if (strcmp(field->type, "pid_t") == 0)
sc->arg_fmt[idx].scnprintf = SCA_PID;
else if (strcmp(field->type, "umode_t") == 0)
sc->arg_fmt[idx].scnprintf = SCA_MODE_T;
else if ((strcmp(field->type, "int") == 0 ||
strcmp(field->type, "unsigned int") == 0 ||
strcmp(field->type, "long") == 0) &&
(len = strlen(field->name)) >= 2 &&
strcmp(field->name + len - 2, "fd") == 0) {
/*
* /sys/kernel/tracing/events/syscalls/sys_enter*
* egrep 'field:.*fd;' .../format|sed -r 's/.*field:([a-z ]+) [a-z_]*fd.+/\1/g'|sort|uniq -c
* 65 int
* 23 unsigned int
* 7 unsigned long
*/
sc->arg_fmt[idx].scnprintf = SCA_FD;
}
}
return 0;
}
static int trace__read_syscall_info(struct trace *trace, int id)
{
char tp_name[128];
struct syscall *sc;
const char *name = syscalltbl__name(trace->sctbl, id);
if (name == NULL)
return -1;
if (id > trace->syscalls.max) {
struct syscall *nsyscalls = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc));
if (nsyscalls == NULL)
return -1;
if (trace->syscalls.max != -1) {
memset(nsyscalls + trace->syscalls.max + 1, 0,
(id - trace->syscalls.max) * sizeof(*sc));
} else {
memset(nsyscalls, 0, (id + 1) * sizeof(*sc));
}
trace->syscalls.table = nsyscalls;
trace->syscalls.max = id;
}
sc = trace->syscalls.table + id;
sc->name = name;
sc->fmt = syscall_fmt__find(sc->name);
snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
sc->tp_format = trace_event__tp_format("syscalls", tp_name);
if (IS_ERR(sc->tp_format) && sc->fmt && sc->fmt->alias) {
snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
sc->tp_format = trace_event__tp_format("syscalls", tp_name);
}
if (syscall__alloc_arg_fmts(sc, IS_ERR(sc->tp_format) ? 6 : sc->tp_format->format.nr_fields))
return -1;
if (IS_ERR(sc->tp_format))
return -1;
sc->args = sc->tp_format->format.fields;
/*
* We need to check and discard the first variable '__syscall_nr'
* or 'nr' that mean the syscall number. It is needless here.
* So drop '__syscall_nr' or 'nr' field but does not exist on older kernels.
*/
if (sc->args && (!strcmp(sc->args->name, "__syscall_nr") || !strcmp(sc->args->name, "nr"))) {
sc->args = sc->args->next;
--sc->nr_args;
}
sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");
sc->is_open = !strcmp(name, "open") || !strcmp(name, "openat");
return syscall__set_arg_fmts(sc);
}
static int trace__validate_ev_qualifier(struct trace *trace)
{
int err = 0, i;
size_t nr_allocated;
struct str_node *pos;
trace->ev_qualifier_ids.nr = strlist__nr_entries(trace->ev_qualifier);
trace->ev_qualifier_ids.entries = malloc(trace->ev_qualifier_ids.nr *
sizeof(trace->ev_qualifier_ids.entries[0]));
if (trace->ev_qualifier_ids.entries == NULL) {
fputs("Error:\tNot enough memory for allocating events qualifier ids\n",
trace->output);
err = -EINVAL;
goto out;
}
nr_allocated = trace->ev_qualifier_ids.nr;
i = 0;
strlist__for_each_entry(pos, trace->ev_qualifier) {
const char *sc = pos->s;
int id = syscalltbl__id(trace->sctbl, sc), match_next = -1;
if (id < 0) {
id = syscalltbl__strglobmatch_first(trace->sctbl, sc, &match_next);
if (id >= 0)
goto matches;
if (err == 0) {
fputs("Error:\tInvalid syscall ", trace->output);
err = -EINVAL;
} else {
fputs(", ", trace->output);
}
fputs(sc, trace->output);
}
matches:
trace->ev_qualifier_ids.entries[i++] = id;
if (match_next == -1)
continue;
while (1) {
id = syscalltbl__strglobmatch_next(trace->sctbl, sc, &match_next);
if (id < 0)
break;
if (nr_allocated == trace->ev_qualifier_ids.nr) {
void *entries;
nr_allocated += 8;
entries = realloc(trace->ev_qualifier_ids.entries,
nr_allocated * sizeof(trace->ev_qualifier_ids.entries[0]));
if (entries == NULL) {
err = -ENOMEM;
fputs("\nError:\t Not enough memory for parsing\n", trace->output);
goto out_free;
}
trace->ev_qualifier_ids.entries = entries;
}
trace->ev_qualifier_ids.nr++;
trace->ev_qualifier_ids.entries[i++] = id;
}
}
if (err < 0) {
fputs("\nHint:\ttry 'perf list syscalls:sys_enter_*'"
"\nHint:\tand: 'man syscalls'\n", trace->output);
out_free:
zfree(&trace->ev_qualifier_ids.entries);
trace->ev_qualifier_ids.nr = 0;
}
out:
return err;
}
/*
* args is to be interpreted as a series of longs but we need to handle
* 8-byte unaligned accesses. args points to raw_data within the event
* and raw_data is guaranteed to be 8-byte unaligned because it is
* preceded by raw_size which is a u32. So we need to copy args to a temp
* variable to read it. Most notably this avoids extended load instructions
* on unaligned addresses
*/
unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx)
{
unsigned long val;
unsigned char *p = arg->args + sizeof(unsigned long) * idx;
memcpy(&val, p, sizeof(val));
return val;
}
static size_t syscall__scnprintf_name(struct syscall *sc, char *bf, size_t size,
struct syscall_arg *arg)
{
if (sc->arg_fmt && sc->arg_fmt[arg->idx].name)
return scnprintf(bf, size, "%s: ", sc->arg_fmt[arg->idx].name);
return scnprintf(bf, size, "arg%d: ", arg->idx);
}
static size_t syscall__scnprintf_val(struct syscall *sc, char *bf, size_t size,
struct syscall_arg *arg, unsigned long val)
{
if (sc->arg_fmt && sc->arg_fmt[arg->idx].scnprintf) {
arg->val = val;
if (sc->arg_fmt[arg->idx].parm)
arg->parm = sc->arg_fmt[arg->idx].parm;
return sc->arg_fmt[arg->idx].scnprintf(bf, size, arg);
}
return scnprintf(bf, size, "%ld", val);
}
static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
unsigned char *args, struct trace *trace,
struct thread *thread)
{
size_t printed = 0;
unsigned long val;
u8 bit = 1;
struct syscall_arg arg = {
.args = args,
.idx = 0,
.mask = 0,
.trace = trace,
.thread = thread,
};
struct thread_trace *ttrace = thread__priv(thread);
/*
* Things like fcntl will set this in its 'cmd' formatter to pick the
* right formatter for the return value (an fd? file flags?), which is
* not needed for syscalls that always return a given type, say an fd.
*/
ttrace->ret_scnprintf = NULL;
if (sc->args != NULL) {
struct format_field *field;
for (field = sc->args; field;
field = field->next, ++arg.idx, bit <<= 1) {
if (arg.mask & bit)
continue;
val = syscall_arg__val(&arg, arg.idx);
/*
* Suppress this argument if its value is zero and
* and we don't have a string associated in an
* strarray for it.
*/
if (val == 0 &&
!(sc->arg_fmt &&
(sc->arg_fmt[arg.idx].show_zero ||
sc->arg_fmt[arg.idx].scnprintf == SCA_STRARRAY ||
sc->arg_fmt[arg.idx].scnprintf == SCA_STRARRAYS) &&
sc->arg_fmt[arg.idx].parm))
continue;
printed += scnprintf(bf + printed, size - printed,
"%s%s: ", printed ? ", " : "", field->name);
printed += syscall__scnprintf_val(sc, bf + printed, size - printed, &arg, val);
}
} else if (IS_ERR(sc->tp_format)) {
/*
* If we managed to read the tracepoint /format file, then we
* may end up not having any args, like with gettid(), so only
* print the raw args when we didn't manage to read it.
*/
while (arg.idx < sc->nr_args) {
if (arg.mask & bit)
goto next_arg;
val = syscall_arg__val(&arg, arg.idx);
if (printed)
printed += scnprintf(bf + printed, size - printed, ", ");
printed += syscall__scnprintf_name(sc, bf + printed, size - printed, &arg);
printed += syscall__scnprintf_val(sc, bf + printed, size - printed, &arg, val);
next_arg:
++arg.idx;
bit <<= 1;
}
}
return printed;
}
typedef int (*tracepoint_handler)(struct trace *trace, struct perf_evsel *evsel,
union perf_event *event,
struct perf_sample *sample);
static struct syscall *trace__syscall_info(struct trace *trace,
struct perf_evsel *evsel, int id)
{
if (id < 0) {
/*
* XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried
* before that, leaving at a higher verbosity level till that is
* explained. Reproduced with plain ftrace with:
*
* echo 1 > /t/events/raw_syscalls/sys_exit/enable
* grep "NR -1 " /t/trace_pipe
*
* After generating some load on the machine.
*/
if (verbose > 1) {
static u64 n;
fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n",
id, perf_evsel__name(evsel), ++n);
}
return NULL;
}
if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL) &&
trace__read_syscall_info(trace, id))
goto out_cant_read;
if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL))
goto out_cant_read;
return &trace->syscalls.table[id];
out_cant_read:
if (verbose > 0) {
fprintf(trace->output, "Problems reading syscall %d", id);
if (id <= trace->syscalls.max && trace->syscalls.table[id].name != NULL)
fprintf(trace->output, "(%s)", trace->syscalls.table[id].name);
fputs(" information\n", trace->output);
}
return NULL;
}
static void thread__update_stats(struct thread_trace *ttrace,
int id, struct perf_sample *sample)
{
struct int_node *inode;
struct stats *stats;
u64 duration = 0;
inode = intlist__findnew(ttrace->syscall_stats, id);
if (inode == NULL)
return;
stats = inode->priv;
if (stats == NULL) {
stats = malloc(sizeof(struct stats));
if (stats == NULL)
return;
init_stats(stats);
inode->priv = stats;
}
if (ttrace->entry_time && sample->time > ttrace->entry_time)
duration = sample->time - ttrace->entry_time;
update_stats(stats, duration);
}
static int trace__printf_interrupted_entry(struct trace *trace)
{
struct thread_trace *ttrace;
size_t printed;
if (trace->failure_only || trace->current == NULL)
return 0;
ttrace = thread__priv(trace->current);
if (!ttrace->entry_pending)
return 0;
printed = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);
printed += fprintf(trace->output, "%-70s) ...\n", ttrace->entry_str);
ttrace->entry_pending = false;
return printed;
}
static int trace__fprintf_sample(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample, struct thread *thread)
{
int printed = 0;
if (trace->print_sample) {
double ts = (double)sample->time / NSEC_PER_MSEC;
printed += fprintf(trace->output, "%22s %10.3f %s %d/%d [%d]\n",
perf_evsel__name(evsel), ts,
thread__comm_str(thread),
sample->pid, sample->tid, sample->cpu);
}
return printed;
}
static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
char *msg;
void *args;
size_t printed = 0;
struct thread *thread;
int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
struct syscall *sc = trace__syscall_info(trace, evsel, id);
struct thread_trace *ttrace;
if (sc == NULL)
return -1;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_put;
trace__fprintf_sample(trace, evsel, sample, thread);
args = perf_evsel__sc_tp_ptr(evsel, args, sample);
if (ttrace->entry_str == NULL) {
ttrace->entry_str = malloc(trace__entry_str_size);
if (!ttrace->entry_str)
goto out_put;
}
if (!(trace->duration_filter || trace->summary_only || trace->min_stack))
trace__printf_interrupted_entry(trace);
ttrace->entry_time = sample->time;
msg = ttrace->entry_str;
printed += scnprintf(msg + printed, trace__entry_str_size - printed, "%s(", sc->name);
printed += syscall__scnprintf_args(sc, msg + printed, trace__entry_str_size - printed,
args, trace, thread);
if (sc->is_exit) {
if (!(trace->duration_filter || trace->summary_only || trace->failure_only || trace->min_stack)) {
trace__fprintf_entry_head(trace, thread, 0, false, ttrace->entry_time, trace->output);
fprintf(trace->output, "%-70s)\n", ttrace->entry_str);
}
} else {
ttrace->entry_pending = true;
/* See trace__vfs_getname & trace__sys_exit */
ttrace->filename.pending_open = false;
}
if (trace->current != thread) {
thread__put(trace->current);
trace->current = thread__get(thread);
}
err = 0;
out_put:
thread__put(thread);
return err;
}
static int trace__fprintf_sys_enter(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample)
{
struct thread_trace *ttrace;
struct thread *thread;
int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
struct syscall *sc = trace__syscall_info(trace, evsel, id);
char msg[1024];
void *args;
if (sc == NULL)
return -1;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
ttrace = thread__trace(thread, trace->output);
/*
* We need to get ttrace just to make sure it is there when syscall__scnprintf_args()
* and the rest of the beautifiers accessing it via struct syscall_arg touches it.
*/
if (ttrace == NULL)
goto out_put;
args = perf_evsel__sc_tp_ptr(evsel, args, sample);
syscall__scnprintf_args(sc, msg, sizeof(msg), args, trace, thread);
fprintf(trace->output, "%s", msg);
err = 0;
out_put:
thread__put(thread);
return err;
}
static int trace__resolve_callchain(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample,
struct callchain_cursor *cursor)
{
struct addr_location al;
int max_stack = evsel->attr.sample_max_stack ?
evsel->attr.sample_max_stack :
trace->max_stack;
if (machine__resolve(trace->host, &al, sample) < 0 ||
thread__resolve_callchain(al.thread, cursor, evsel, sample, NULL, NULL, max_stack))
return -1;
return 0;
}
static int trace__fprintf_callchain(struct trace *trace, struct perf_sample *sample)
{
/* TODO: user-configurable print_opts */
const unsigned int print_opts = EVSEL__PRINT_SYM |
EVSEL__PRINT_DSO |
EVSEL__PRINT_UNKNOWN_AS_ADDR;
return sample__fprintf_callchain(sample, 38, print_opts, &callchain_cursor, trace->output);
}
static const char *errno_to_name(struct perf_evsel *evsel, int err)
{
struct perf_env *env = perf_evsel__env(evsel);
const char *arch_name = perf_env__arch(env);
return arch_syscalls__strerrno(arch_name, err);
}
static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
long ret;
u64 duration = 0;
bool duration_calculated = false;
struct thread *thread;
int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1, callchain_ret = 0;
struct syscall *sc = trace__syscall_info(trace, evsel, id);
struct thread_trace *ttrace;
if (sc == NULL)
return -1;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_put;
trace__fprintf_sample(trace, evsel, sample, thread);
if (trace->summary)
thread__update_stats(ttrace, id, sample);
ret = perf_evsel__sc_tp_uint(evsel, ret, sample);
if (sc->is_open && ret >= 0 && ttrace->filename.pending_open) {
trace__set_fd_pathname(thread, ret, ttrace->filename.name);
ttrace->filename.pending_open = false;
++trace->stats.vfs_getname;
}
if (ttrace->entry_time) {
duration = sample->time - ttrace->entry_time;
if (trace__filter_duration(trace, duration))
goto out;
duration_calculated = true;
} else if (trace->duration_filter)
goto out;
if (sample->callchain) {
callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
if (callchain_ret == 0) {
if (callchain_cursor.nr < trace->min_stack)
goto out;
callchain_ret = 1;
}
}
if (trace->summary_only || (ret >= 0 && trace->failure_only))
goto out;
trace__fprintf_entry_head(trace, thread, duration, duration_calculated, ttrace->entry_time, trace->output);
if (ttrace->entry_pending) {
fprintf(trace->output, "%-70s", ttrace->entry_str);
} else {
fprintf(trace->output, " ... [");
color_fprintf(trace->output, PERF_COLOR_YELLOW, "continued");
fprintf(trace->output, "]: %s()", sc->name);
}
if (sc->fmt == NULL) {
if (ret < 0)
goto errno_print;
signed_print:
fprintf(trace->output, ") = %ld", ret);
} else if (ret < 0) {
errno_print: {
char bf[STRERR_BUFSIZE];
const char *emsg = str_error_r(-ret, bf, sizeof(bf)),
*e = errno_to_name(evsel, -ret);
fprintf(trace->output, ") = -1 %s %s", e, emsg);
}
} else if (ret == 0 && sc->fmt->timeout)
fprintf(trace->output, ") = 0 Timeout");
else if (ttrace->ret_scnprintf) {
char bf[1024];
struct syscall_arg arg = {
.val = ret,
.thread = thread,
.trace = trace,
};
ttrace->ret_scnprintf(bf, sizeof(bf), &arg);
ttrace->ret_scnprintf = NULL;
fprintf(trace->output, ") = %s", bf);
} else if (sc->fmt->hexret)
fprintf(trace->output, ") = %#lx", ret);
else if (sc->fmt->errpid) {
struct thread *child = machine__find_thread(trace->host, ret, ret);
if (child != NULL) {
fprintf(trace->output, ") = %ld", ret);
if (child->comm_set)
fprintf(trace->output, " (%s)", thread__comm_str(child));
thread__put(child);
}
} else
goto signed_print;
fputc('\n', trace->output);
if (callchain_ret > 0)
trace__fprintf_callchain(trace, sample);
else if (callchain_ret < 0)
pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
out:
ttrace->entry_pending = false;
err = 0;
out_put:
thread__put(thread);
return err;
}
static int trace__vfs_getname(struct trace *trace, struct perf_evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
struct thread *thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
struct thread_trace *ttrace;
size_t filename_len, entry_str_len, to_move;
ssize_t remaining_space;
char *pos;
const char *filename = perf_evsel__rawptr(evsel, sample, "pathname");
if (!thread)
goto out;
ttrace = thread__priv(thread);
if (!ttrace)
goto out_put;
filename_len = strlen(filename);
if (filename_len == 0)
goto out_put;
if (ttrace->filename.namelen < filename_len) {
char *f = realloc(ttrace->filename.name, filename_len + 1);
if (f == NULL)
goto out_put;
ttrace->filename.namelen = filename_len;
ttrace->filename.name = f;
}
strcpy(ttrace->filename.name, filename);
ttrace->filename.pending_open = true;
if (!ttrace->filename.ptr)
goto out_put;
entry_str_len = strlen(ttrace->entry_str);
remaining_space = trace__entry_str_size - entry_str_len - 1; /* \0 */
if (remaining_space <= 0)
goto out_put;
if (filename_len > (size_t)remaining_space) {
filename += filename_len - remaining_space;
filename_len = remaining_space;
}
to_move = entry_str_len - ttrace->filename.entry_str_pos + 1; /* \0 */
pos = ttrace->entry_str + ttrace->filename.entry_str_pos;
memmove(pos + filename_len, pos, to_move);
memcpy(pos, filename, filename_len);
ttrace->filename.ptr = 0;
ttrace->filename.entry_str_pos = 0;
out_put:
thread__put(thread);
out:
return 0;
}
static int trace__sched_stat_runtime(struct trace *trace, struct perf_evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
double runtime_ms = (double)runtime / NSEC_PER_MSEC;
struct thread *thread = machine__findnew_thread(trace->host,
sample->pid,
sample->tid);
struct thread_trace *ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_dump;
ttrace->runtime_ms += runtime_ms;
trace->runtime_ms += runtime_ms;
out_put:
thread__put(thread);
return 0;
out_dump:
fprintf(trace->output, "%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",
evsel->name,
perf_evsel__strval(evsel, sample, "comm"),
(pid_t)perf_evsel__intval(evsel, sample, "pid"),
runtime,
perf_evsel__intval(evsel, sample, "vruntime"));
goto out_put;
}
static int bpf_output__printer(enum binary_printer_ops op,
unsigned int val, void *extra __maybe_unused, FILE *fp)
{
unsigned char ch = (unsigned char)val;
switch (op) {
case BINARY_PRINT_CHAR_DATA:
return fprintf(fp, "%c", isprint(ch) ? ch : '.');
case BINARY_PRINT_DATA_BEGIN:
case BINARY_PRINT_LINE_BEGIN:
case BINARY_PRINT_ADDR:
case BINARY_PRINT_NUM_DATA:
case BINARY_PRINT_NUM_PAD:
case BINARY_PRINT_SEP:
case BINARY_PRINT_CHAR_PAD:
case BINARY_PRINT_LINE_END:
case BINARY_PRINT_DATA_END:
default:
break;
}
return 0;
}
static void bpf_output__fprintf(struct trace *trace,
struct perf_sample *sample)
{
binary__fprintf(sample->raw_data, sample->raw_size, 8,
bpf_output__printer, NULL, trace->output);
}
static int trace__event_handler(struct trace *trace, struct perf_evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
int callchain_ret = 0;
if (sample->callchain) {
callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
if (callchain_ret == 0) {
if (callchain_cursor.nr < trace->min_stack)
goto out;
callchain_ret = 1;
}
}
trace__printf_interrupted_entry(trace);
trace__fprintf_tstamp(trace, sample->time, trace->output);
if (trace->trace_syscalls)
fprintf(trace->output, "( ): ");
fprintf(trace->output, "%s:", evsel->name);
if (perf_evsel__is_bpf_output(evsel)) {
if (evsel == trace->syscalls.events.augmented)
trace__fprintf_sys_enter(trace, evsel, sample);
else
bpf_output__fprintf(trace, sample);
} else if (evsel->tp_format) {
if (strncmp(evsel->tp_format->name, "sys_enter_", 10) ||
trace__fprintf_sys_enter(trace, evsel, sample)) {
event_format__fprintf(evsel->tp_format, sample->cpu,
sample->raw_data, sample->raw_size,
trace->output);
}
}
fprintf(trace->output, "\n");
if (callchain_ret > 0)
trace__fprintf_callchain(trace, sample);
else if (callchain_ret < 0)
pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
out:
return 0;
}
static void print_location(FILE *f, struct perf_sample *sample,
struct addr_location *al,
bool print_dso, bool print_sym)
{
if ((verbose > 0 || print_dso) && al->map)
fprintf(f, "%s@", al->map->dso->long_name);
if ((verbose > 0 || print_sym) && al->sym)
fprintf(f, "%s+0x%" PRIx64, al->sym->name,
al->addr - al->sym->start);
else if (al->map)
fprintf(f, "0x%" PRIx64, al->addr);
else
fprintf(f, "0x%" PRIx64, sample->addr);
}
static int trace__pgfault(struct trace *trace,
struct perf_evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
struct thread *thread;
struct addr_location al;
char map_type = 'd';
struct thread_trace *ttrace;
int err = -1;
int callchain_ret = 0;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
if (sample->callchain) {
callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
if (callchain_ret == 0) {
if (callchain_cursor.nr < trace->min_stack)
goto out_put;
callchain_ret = 1;
}
}
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_put;
if (evsel->attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)
ttrace->pfmaj++;
else
ttrace->pfmin++;
if (trace->summary_only)
goto out;
thread__find_symbol(thread, sample->cpumode, sample->ip, &al);
trace__fprintf_entry_head(trace, thread, 0, true, sample->time, trace->output);
fprintf(trace->output, "%sfault [",
evsel->attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ?
"maj" : "min");
print_location(trace->output, sample, &al, false, true);
fprintf(trace->output, "] => ");
thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
if (!al.map) {
thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
if (al.map)
map_type = 'x';
else
map_type = '?';
}
print_location(trace->output, sample, &al, true, false);
fprintf(trace->output, " (%c%c)\n", map_type, al.level);
if (callchain_ret > 0)
trace__fprintf_callchain(trace, sample);
else if (callchain_ret < 0)
pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
out:
err = 0;
out_put:
thread__put(thread);
return err;
}
static void trace__set_base_time(struct trace *trace,
struct perf_evsel *evsel,
struct perf_sample *sample)
{
/*
* BPF events were not setting PERF_SAMPLE_TIME, so be more robust
* and don't use sample->time unconditionally, we may end up having
* some other event in the future without PERF_SAMPLE_TIME for good
* reason, i.e. we may not be interested in its timestamps, just in
* it taking place, picking some piece of information when it
* appears in our event stream (vfs_getname comes to mind).
*/
if (trace->base_time == 0 && !trace->full_time &&
(evsel->attr.sample_type & PERF_SAMPLE_TIME))
trace->base_time = sample->time;
}
static int trace__process_sample(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine __maybe_unused)
{
struct trace *trace = container_of(tool, struct trace, tool);
struct thread *thread;
int err = 0;
tracepoint_handler handler = evsel->handler;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
if (thread && thread__is_filtered(thread))
goto out;
trace__set_base_time(trace, evsel, sample);
if (handler) {
++trace->nr_events;
handler(trace, evsel, event, sample);
}
out:
thread__put(thread);
return err;
}
static int trace__record(struct trace *trace, int argc, const char **argv)
{
unsigned int rec_argc, i, j;
const char **rec_argv;
const char * const record_args[] = {
"record",
"-R",
"-m", "1024",
"-c", "1",
};
const char * const sc_args[] = { "-e", };
unsigned int sc_args_nr = ARRAY_SIZE(sc_args);
const char * const majpf_args[] = { "-e", "major-faults" };
unsigned int majpf_args_nr = ARRAY_SIZE(majpf_args);
const char * const minpf_args[] = { "-e", "minor-faults" };
unsigned int minpf_args_nr = ARRAY_SIZE(minpf_args);
/* +1 is for the event string below */
rec_argc = ARRAY_SIZE(record_args) + sc_args_nr + 1 +
majpf_args_nr + minpf_args_nr + argc;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
if (rec_argv == NULL)
return -ENOMEM;
j = 0;
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[j++] = record_args[i];
if (trace->trace_syscalls) {
for (i = 0; i < sc_args_nr; i++)
rec_argv[j++] = sc_args[i];
/* event string may be different for older kernels - e.g., RHEL6 */
if (is_valid_tracepoint("raw_syscalls:sys_enter"))
rec_argv[j++] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";
else if (is_valid_tracepoint("syscalls:sys_enter"))
rec_argv[j++] = "syscalls:sys_enter,syscalls:sys_exit";
else {
pr_err("Neither raw_syscalls nor syscalls events exist.\n");
free(rec_argv);
return -1;
}
}
if (trace->trace_pgfaults & TRACE_PFMAJ)
for (i = 0; i < majpf_args_nr; i++)
rec_argv[j++] = majpf_args[i];
if (trace->trace_pgfaults & TRACE_PFMIN)
for (i = 0; i < minpf_args_nr; i++)
rec_argv[j++] = minpf_args[i];
for (i = 0; i < (unsigned int)argc; i++)
rec_argv[j++] = argv[i];
return cmd_record(j, rec_argv);
}
static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
static bool perf_evlist__add_vfs_getname(struct perf_evlist *evlist)
{
struct perf_evsel *evsel = perf_evsel__newtp("probe", "vfs_getname");
if (IS_ERR(evsel))
return false;
if (perf_evsel__field(evsel, "pathname") == NULL) {
perf_evsel__delete(evsel);
return false;
}
evsel->handler = trace__vfs_getname;
perf_evlist__add(evlist, evsel);
return true;
}
static struct perf_evsel *perf_evsel__new_pgfault(u64 config)
{
struct perf_evsel *evsel;
struct perf_event_attr attr = {
.type = PERF_TYPE_SOFTWARE,
.mmap_data = 1,
};
attr.config = config;
attr.sample_period = 1;
event_attr_init(&attr);
evsel = perf_evsel__new(&attr);
if (evsel)
evsel->handler = trace__pgfault;
return evsel;
}
static void trace__handle_event(struct trace *trace, union perf_event *event, struct perf_sample *sample)
{
const u32 type = event->header.type;
struct perf_evsel *evsel;
if (type != PERF_RECORD_SAMPLE) {
trace__process_event(trace, trace->host, event, sample);
return;
}
evsel = perf_evlist__id2evsel(trace->evlist, sample->id);
if (evsel == NULL) {
fprintf(trace->output, "Unknown tp ID %" PRIu64 ", skipping...\n", sample->id);
return;
}
trace__set_base_time(trace, evsel, sample);
if (evsel->attr.type == PERF_TYPE_TRACEPOINT &&
sample->raw_data == NULL) {
fprintf(trace->output, "%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
perf_evsel__name(evsel), sample->tid,
sample->cpu, sample->raw_size);
} else {
tracepoint_handler handler = evsel->handler;
handler(trace, evsel, event, sample);
}
}
static int trace__add_syscall_newtp(struct trace *trace)
{
int ret = -1;
struct perf_evlist *evlist = trace->evlist;
struct perf_evsel *sys_enter, *sys_exit;
sys_enter = perf_evsel__raw_syscall_newtp("sys_enter", trace__sys_enter);
if (sys_enter == NULL)
goto out;
if (perf_evsel__init_sc_tp_ptr_field(sys_enter, args))
goto out_delete_sys_enter;
sys_exit = perf_evsel__raw_syscall_newtp("sys_exit", trace__sys_exit);
if (sys_exit == NULL)
goto out_delete_sys_enter;
if (perf_evsel__init_sc_tp_uint_field(sys_exit, ret))
goto out_delete_sys_exit;
perf_evsel__config_callchain(sys_enter, &trace->opts, &callchain_param);
perf_evsel__config_callchain(sys_exit, &trace->opts, &callchain_param);
perf_evlist__add(evlist, sys_enter);
perf_evlist__add(evlist, sys_exit);
if (callchain_param.enabled && !trace->kernel_syscallchains) {
/*
* We're interested only in the user space callchain
* leading to the syscall, allow overriding that for
* debugging reasons using --kernel_syscall_callchains
*/
sys_exit->attr.exclude_callchain_kernel = 1;
}
trace->syscalls.events.sys_enter = sys_enter;
trace->syscalls.events.sys_exit = sys_exit;
ret = 0;
out:
return ret;
out_delete_sys_exit:
perf_evsel__delete_priv(sys_exit);
out_delete_sys_enter:
perf_evsel__delete_priv(sys_enter);
goto out;
}
static int trace__set_ev_qualifier_filter(struct trace *trace)
{
int err = -1;
struct perf_evsel *sys_exit;
char *filter = asprintf_expr_inout_ints("id", !trace->not_ev_qualifier,
trace->ev_qualifier_ids.nr,
trace->ev_qualifier_ids.entries);
if (filter == NULL)
goto out_enomem;
if (!perf_evsel__append_tp_filter(trace->syscalls.events.sys_enter,
filter)) {
sys_exit = trace->syscalls.events.sys_exit;
err = perf_evsel__append_tp_filter(sys_exit, filter);
}
free(filter);
out:
return err;
out_enomem:
errno = ENOMEM;
goto out;
}
static int trace__set_filter_loop_pids(struct trace *trace)
{
unsigned int nr = 1;
pid_t pids[32] = {
getpid(),
};
struct thread *thread = machine__find_thread(trace->host, pids[0], pids[0]);
while (thread && nr < ARRAY_SIZE(pids)) {
struct thread *parent = machine__find_thread(trace->host, thread->ppid, thread->ppid);
if (parent == NULL)
break;
if (!strcmp(thread__comm_str(parent), "sshd")) {
pids[nr++] = parent->tid;
break;
}
thread = parent;
}
return perf_evlist__set_filter_pids(trace->evlist, nr, pids);
}
static int trace__run(struct trace *trace, int argc, const char **argv)
{
struct perf_evlist *evlist = trace->evlist;
struct perf_evsel *evsel, *pgfault_maj = NULL, *pgfault_min = NULL;
int err = -1, i;
unsigned long before;
const bool forks = argc > 0;
bool draining = false;
trace->live = true;
if (trace->trace_syscalls && trace__add_syscall_newtp(trace))
goto out_error_raw_syscalls;
if (trace->trace_syscalls)
trace->vfs_getname = perf_evlist__add_vfs_getname(evlist);
if ((trace->trace_pgfaults & TRACE_PFMAJ)) {
pgfault_maj = perf_evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MAJ);
if (pgfault_maj == NULL)
goto out_error_mem;
perf_evsel__config_callchain(pgfault_maj, &trace->opts, &callchain_param);
perf_evlist__add(evlist, pgfault_maj);
}
if ((trace->trace_pgfaults & TRACE_PFMIN)) {
pgfault_min = perf_evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MIN);
if (pgfault_min == NULL)
goto out_error_mem;
perf_evsel__config_callchain(pgfault_min, &trace->opts, &callchain_param);
perf_evlist__add(evlist, pgfault_min);
}
if (trace->sched &&
perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
trace__sched_stat_runtime))
goto out_error_sched_stat_runtime;
/*
* If a global cgroup was set, apply it to all the events without an
* explicit cgroup. I.e.:
*
* trace -G A -e sched:*switch
*
* Will set all raw_syscalls:sys_{enter,exit}, pgfault, vfs_getname, etc
* _and_ sched:sched_switch to the 'A' cgroup, while:
*
* trace -e sched:*switch -G A
*
* will only set the sched:sched_switch event to the 'A' cgroup, all the
* other events (raw_syscalls:sys_{enter,exit}, etc are left "without"
* a cgroup (on the root cgroup, sys wide, etc).
*
* Multiple cgroups:
*
* trace -G A -e sched:*switch -G B
*
* the syscall ones go to the 'A' cgroup, the sched:sched_switch goes
* to the 'B' cgroup.
*
* evlist__set_default_cgroup() grabs a reference of the passed cgroup
* only for the evsels still without a cgroup, i.e. evsel->cgroup == NULL.
*/
if (trace->cgroup)
evlist__set_default_cgroup(trace->evlist, trace->cgroup);
err = perf_evlist__create_maps(evlist, &trace->opts.target);
if (err < 0) {
fprintf(trace->output, "Problems parsing the target to trace, check your options!\n");
goto out_delete_evlist;
}
err = trace__symbols_init(trace, evlist);
if (err < 0) {
fprintf(trace->output, "Problems initializing symbol libraries!\n");
goto out_delete_evlist;
}
perf_evlist__config(evlist, &trace->opts, &callchain_param);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
if (forks) {
err = perf_evlist__prepare_workload(evlist, &trace->opts.target,
argv, false, NULL);
if (err < 0) {
fprintf(trace->output, "Couldn't run the workload!\n");
goto out_delete_evlist;
}
}
err = perf_evlist__open(evlist);
if (err < 0)
goto out_error_open;
err = bpf__apply_obj_config();
if (err) {
char errbuf[BUFSIZ];
bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
pr_err("ERROR: Apply config to BPF failed: %s\n",
errbuf);
goto out_error_open;
}
/*
* Better not use !target__has_task() here because we need to cover the
* case where no threads were specified in the command line, but a
* workload was, and in that case we will fill in the thread_map when
* we fork the workload in perf_evlist__prepare_workload.
*/
if (trace->filter_pids.nr > 0)
err = perf_evlist__set_filter_pids(evlist, trace->filter_pids.nr, trace->filter_pids.entries);
else if (thread_map__pid(evlist->threads, 0) == -1)
err = trace__set_filter_loop_pids(trace);
if (err < 0)
goto out_error_mem;
if (trace->ev_qualifier_ids.nr > 0) {
err = trace__set_ev_qualifier_filter(trace);
if (err < 0)
goto out_errno;
pr_debug("event qualifier tracepoint filter: %s\n",
trace->syscalls.events.sys_exit->filter);
}
err = perf_evlist__apply_filters(evlist, &evsel);
if (err < 0)
goto out_error_apply_filters;
err = perf_evlist__mmap(evlist, trace->opts.mmap_pages);
if (err < 0)
goto out_error_mmap;
if (!target__none(&trace->opts.target) && !trace->opts.initial_delay)
perf_evlist__enable(evlist);
if (forks)
perf_evlist__start_workload(evlist);
if (trace->opts.initial_delay) {
usleep(trace->opts.initial_delay * 1000);
perf_evlist__enable(evlist);
}
trace->multiple_threads = thread_map__pid(evlist->threads, 0) == -1 ||
evlist->threads->nr > 1 ||
perf_evlist__first(evlist)->attr.inherit;
/*
* Now that we already used evsel->attr to ask the kernel to setup the
* events, lets reuse evsel->attr.sample_max_stack as the limit in
* trace__resolve_callchain(), allowing per-event max-stack settings
* to override an explicitely set --max-stack global setting.
*/
evlist__for_each_entry(evlist, evsel) {
if (evsel__has_callchain(evsel) &&
evsel->attr.sample_max_stack == 0)
evsel->attr.sample_max_stack = trace->max_stack;
}
again:
before = trace->nr_events;
for (i = 0; i < evlist->nr_mmaps; i++) {
union perf_event *event;
struct perf_mmap *md;
md = &evlist->mmap[i];
if (perf_mmap__read_init(md) < 0)
continue;
while ((event = perf_mmap__read_event(md)) != NULL) {
struct perf_sample sample;
++trace->nr_events;
err = perf_evlist__parse_sample(evlist, event, &sample);
if (err) {
fprintf(trace->output, "Can't parse sample, err = %d, skipping...\n", err);
goto next_event;
}
trace__handle_event(trace, event, &sample);
next_event:
perf_mmap__consume(md);
if (interrupted)
goto out_disable;
if (done && !draining) {
perf_evlist__disable(evlist);
draining = true;
}
}
perf_mmap__read_done(md);
}
if (trace->nr_events == before) {
int timeout = done ? 100 : -1;
if (!draining && perf_evlist__poll(evlist, timeout) > 0) {
if (perf_evlist__filter_pollfd(evlist, POLLERR | POLLHUP) == 0)
draining = true;
goto again;
}
} else {
goto again;
}
out_disable:
thread__zput(trace->current);
perf_evlist__disable(evlist);
if (!err) {
if (trace->summary)
trace__fprintf_thread_summary(trace, trace->output);
if (trace->show_tool_stats) {
fprintf(trace->output, "Stats:\n "
" vfs_getname : %" PRIu64 "\n"
" proc_getname: %" PRIu64 "\n",
trace->stats.vfs_getname,
trace->stats.proc_getname);
}
}
out_delete_evlist:
trace__symbols__exit(trace);
perf_evlist__delete(evlist);
cgroup__put(trace->cgroup);
trace->evlist = NULL;
trace->live = false;
return err;
{
char errbuf[BUFSIZ];
out_error_sched_stat_runtime:
tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");
goto out_error;
out_error_raw_syscalls:
tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "raw_syscalls", "sys_(enter|exit)");
goto out_error;
out_error_mmap:
perf_evlist__strerror_mmap(evlist, errno, errbuf, sizeof(errbuf));
goto out_error;
out_error_open:
perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
out_error:
fprintf(trace->output, "%s\n", errbuf);
goto out_delete_evlist;
out_error_apply_filters:
fprintf(trace->output,
"Failed to set filter \"%s\" on event %s with %d (%s)\n",
evsel->filter, perf_evsel__name(evsel), errno,
str_error_r(errno, errbuf, sizeof(errbuf)));
goto out_delete_evlist;
}
out_error_mem:
fprintf(trace->output, "Not enough memory to run!\n");
goto out_delete_evlist;
out_errno:
fprintf(trace->output, "errno=%d,%s\n", errno, strerror(errno));
goto out_delete_evlist;
}
static int trace__replay(struct trace *trace)
{
const struct perf_evsel_str_handler handlers[] = {
{ "probe:vfs_getname", trace__vfs_getname, },
};
struct perf_data data = {
.file = {
.path = input_name,
},
.mode = PERF_DATA_MODE_READ,
.force = trace->force,
};
struct perf_session *session;
struct perf_evsel *evsel;
int err = -1;
trace->tool.sample = trace__process_sample;
trace->tool.mmap = perf_event__process_mmap;
trace->tool.mmap2 = perf_event__process_mmap2;
trace->tool.comm = perf_event__process_comm;
trace->tool.exit = perf_event__process_exit;
trace->tool.fork = perf_event__process_fork;
trace->tool.attr = perf_event__process_attr;
trace->tool.tracing_data = perf_event__process_tracing_data;
trace->tool.build_id = perf_event__process_build_id;
trace->tool.namespaces = perf_event__process_namespaces;
trace->tool.ordered_events = true;
trace->tool.ordering_requires_timestamps = true;
/* add tid to output */
trace->multiple_threads = true;
session = perf_session__new(&data, false, &trace->tool);
if (session == NULL)
return -1;
if (trace->opts.target.pid)
symbol_conf.pid_list_str = strdup(trace->opts.target.pid);
if (trace->opts.target.tid)
symbol_conf.tid_list_str = strdup(trace->opts.target.tid);
if (symbol__init(&session->header.env) < 0)
goto out;
trace->host = &session->machines.host;
err = perf_session__set_tracepoints_handlers(session, handlers);
if (err)
goto out;
evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
"raw_syscalls:sys_enter");
/* older kernels have syscalls tp versus raw_syscalls */
if (evsel == NULL)
evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
"syscalls:sys_enter");
if (evsel &&
(perf_evsel__init_raw_syscall_tp(evsel, trace__sys_enter) < 0 ||
perf_evsel__init_sc_tp_ptr_field(evsel, args))) {
pr_err("Error during initialize raw_syscalls:sys_enter event\n");
goto out;
}
evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
"raw_syscalls:sys_exit");
if (evsel == NULL)
evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
"syscalls:sys_exit");
if (evsel &&
(perf_evsel__init_raw_syscall_tp(evsel, trace__sys_exit) < 0 ||
perf_evsel__init_sc_tp_uint_field(evsel, ret))) {
pr_err("Error during initialize raw_syscalls:sys_exit event\n");
goto out;
}
evlist__for_each_entry(session->evlist, evsel) {
if (evsel->attr.type == PERF_TYPE_SOFTWARE &&
(evsel->attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ||
evsel->attr.config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
evsel->attr.config == PERF_COUNT_SW_PAGE_FAULTS))
evsel->handler = trace__pgfault;
}
setup_pager();
err = perf_session__process_events(session);
if (err)
pr_err("Failed to process events, error %d", err);
else if (trace->summary)
trace__fprintf_thread_summary(trace, trace->output);
out:
perf_session__delete(session);
return err;
}
static size_t trace__fprintf_threads_header(FILE *fp)
{
size_t printed;
printed = fprintf(fp, "\n Summary of events:\n\n");
return printed;
}
DEFINE_RESORT_RB(syscall_stats, a->msecs > b->msecs,
struct stats *stats;
double msecs;
int syscall;
)
{
struct int_node *source = rb_entry(nd, struct int_node, rb_node);
struct stats *stats = source->priv;
entry->syscall = source->i;
entry->stats = stats;
entry->msecs = stats ? (u64)stats->n * (avg_stats(stats) / NSEC_PER_MSEC) : 0;
}
static size_t thread__dump_stats(struct thread_trace *ttrace,
struct trace *trace, FILE *fp)
{
size_t printed = 0;
struct syscall *sc;
struct rb_node *nd;
DECLARE_RESORT_RB_INTLIST(syscall_stats, ttrace->syscall_stats);
if (syscall_stats == NULL)
return 0;
printed += fprintf(fp, "\n");
printed += fprintf(fp, " syscall calls total min avg max stddev\n");
printed += fprintf(fp, " (msec) (msec) (msec) (msec) (%%)\n");
printed += fprintf(fp, " --------------- -------- --------- --------- --------- --------- ------\n");
resort_rb__for_each_entry(nd, syscall_stats) {
struct stats *stats = syscall_stats_entry->stats;
if (stats) {
double min = (double)(stats->min) / NSEC_PER_MSEC;
double max = (double)(stats->max) / NSEC_PER_MSEC;
double avg = avg_stats(stats);
double pct;
u64 n = (u64) stats->n;
pct = avg ? 100.0 * stddev_stats(stats)/avg : 0.0;
avg /= NSEC_PER_MSEC;
sc = &trace->syscalls.table[syscall_stats_entry->syscall];
printed += fprintf(fp, " %-15s", sc->name);
printed += fprintf(fp, " %8" PRIu64 " %9.3f %9.3f %9.3f",
n, syscall_stats_entry->msecs, min, avg);
printed += fprintf(fp, " %9.3f %9.2f%%\n", max, pct);
}
}
resort_rb__delete(syscall_stats);
printed += fprintf(fp, "\n\n");
return printed;
}
static size_t trace__fprintf_thread(FILE *fp, struct thread *thread, struct trace *trace)
{
size_t printed = 0;
struct thread_trace *ttrace = thread__priv(thread);
double ratio;
if (ttrace == NULL)
return 0;
ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
printed += fprintf(fp, " %s (%d), ", thread__comm_str(thread), thread->tid);
printed += fprintf(fp, "%lu events, ", ttrace->nr_events);
printed += fprintf(fp, "%.1f%%", ratio);
if (ttrace->pfmaj)
printed += fprintf(fp, ", %lu majfaults", ttrace->pfmaj);
if (ttrace->pfmin)
printed += fprintf(fp, ", %lu minfaults", ttrace->pfmin);
if (trace->sched)
printed += fprintf(fp, ", %.3f msec\n", ttrace->runtime_ms);
else if (fputc('\n', fp) != EOF)
++printed;
printed += thread__dump_stats(ttrace, trace, fp);
return printed;
}
static unsigned long thread__nr_events(struct thread_trace *ttrace)
{
return ttrace ? ttrace->nr_events : 0;
}
DEFINE_RESORT_RB(threads, (thread__nr_events(a->thread->priv) < thread__nr_events(b->thread->priv)),
struct thread *thread;
)
{
entry->thread = rb_entry(nd, struct thread, rb_node);
}
static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
{
size_t printed = trace__fprintf_threads_header(fp);
struct rb_node *nd;
int i;
for (i = 0; i < THREADS__TABLE_SIZE; i++) {
DECLARE_RESORT_RB_MACHINE_THREADS(threads, trace->host, i);
if (threads == NULL) {
fprintf(fp, "%s", "Error sorting output by nr_events!\n");
return 0;
}
resort_rb__for_each_entry(nd, threads)
printed += trace__fprintf_thread(fp, threads_entry->thread, trace);
resort_rb__delete(threads);
}
return printed;
}
static int trace__set_duration(const struct option *opt, const char *str,
int unset __maybe_unused)
{
struct trace *trace = opt->value;
trace->duration_filter = atof(str);
return 0;
}
static int trace__set_filter_pids(const struct option *opt, const char *str,
int unset __maybe_unused)
{
int ret = -1;
size_t i;
struct trace *trace = opt->value;
/*
* FIXME: introduce a intarray class, plain parse csv and create a
* { int nr, int entries[] } struct...
*/
struct intlist *list = intlist__new(str);
if (list == NULL)
return -1;
i = trace->filter_pids.nr = intlist__nr_entries(list) + 1;
trace->filter_pids.entries = calloc(i, sizeof(pid_t));
if (trace->filter_pids.entries == NULL)
goto out;
trace->filter_pids.entries[0] = getpid();
for (i = 1; i < trace->filter_pids.nr; ++i)
trace->filter_pids.entries[i] = intlist__entry(list, i - 1)->i;
intlist__delete(list);
ret = 0;
out:
return ret;
}
static int trace__open_output(struct trace *trace, const char *filename)
{
struct stat st;
if (!stat(filename, &st) && st.st_size) {
char oldname[PATH_MAX];
scnprintf(oldname, sizeof(oldname), "%s.old", filename);
unlink(oldname);
rename(filename, oldname);
}
trace->output = fopen(filename, "w");
return trace->output == NULL ? -errno : 0;
}
static int parse_pagefaults(const struct option *opt, const char *str,
int unset __maybe_unused)
{
int *trace_pgfaults = opt->value;
if (strcmp(str, "all") == 0)
*trace_pgfaults |= TRACE_PFMAJ | TRACE_PFMIN;
else if (strcmp(str, "maj") == 0)
*trace_pgfaults |= TRACE_PFMAJ;
else if (strcmp(str, "min") == 0)
*trace_pgfaults |= TRACE_PFMIN;
else
return -1;
return 0;
}
static void evlist__set_evsel_handler(struct perf_evlist *evlist, void *handler)
{
struct perf_evsel *evsel;
evlist__for_each_entry(evlist, evsel)
evsel->handler = handler;
}
static int evlist__set_syscall_tp_fields(struct perf_evlist *evlist)
{
struct perf_evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
if (evsel->priv || !evsel->tp_format)
continue;
if (strcmp(evsel->tp_format->system, "syscalls"))
continue;
if (perf_evsel__init_syscall_tp(evsel))
return -1;
if (!strncmp(evsel->tp_format->name, "sys_enter_", 10)) {
struct syscall_tp *sc = evsel->priv;
if (__tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64)))
return -1;
} else if (!strncmp(evsel->tp_format->name, "sys_exit_", 9)) {
struct syscall_tp *sc = evsel->priv;
if (__tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap))
return -1;
}
}
return 0;
}
/*
* XXX: Hackish, just splitting the combined -e+--event (syscalls
* (raw_syscalls:{sys_{enter,exit}} + events (tracepoints, HW, SW, etc) to use
* existing facilities unchanged (trace->ev_qualifier + parse_options()).
*
* It'd be better to introduce a parse_options() variant that would return a
* list with the terms it didn't match to an event...
*/
static int trace__parse_events_option(const struct option *opt, const char *str,
int unset __maybe_unused)
{
struct trace *trace = (struct trace *)opt->value;
const char *s = str;
char *sep = NULL, *lists[2] = { NULL, NULL, };
int len = strlen(str) + 1, err = -1, list, idx;
char *strace_groups_dir = system_path(STRACE_GROUPS_DIR);
char group_name[PATH_MAX];
if (strace_groups_dir == NULL)
return -1;
if (*s == '!') {
++s;
trace->not_ev_qualifier = true;
}
while (1) {
if ((sep = strchr(s, ',')) != NULL)
*sep = '\0';
list = 0;
if (syscalltbl__id(trace->sctbl, s) >= 0 ||
syscalltbl__strglobmatch_first(trace->sctbl, s, &idx) >= 0) {
list = 1;
} else {
path__join(group_name, sizeof(group_name), strace_groups_dir, s);
if (access(group_name, R_OK) == 0)
list = 1;
}
if (lists[list]) {
sprintf(lists[list] + strlen(lists[list]), ",%s", s);
} else {
lists[list] = malloc(len);
if (lists[list] == NULL)
goto out;
strcpy(lists[list], s);
}
if (!sep)
break;
*sep = ',';
s = sep + 1;
}
if (lists[1] != NULL) {
struct strlist_config slist_config = {
.dirname = strace_groups_dir,
};
trace->ev_qualifier = strlist__new(lists[1], &slist_config);
if (trace->ev_qualifier == NULL) {
fputs("Not enough memory to parse event qualifier", trace->output);
goto out;
}
if (trace__validate_ev_qualifier(trace))
goto out;
trace->trace_syscalls = true;
}
err = 0;
if (lists[0]) {
struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event",
"event selector. use 'perf list' to list available events",
parse_events_option);
err = parse_events_option(&o, lists[0], 0);
}
out:
if (sep)
*sep = ',';
return err;
}
static int trace__parse_cgroups(const struct option *opt, const char *str, int unset)
{
struct trace *trace = opt->value;
if (!list_empty(&trace->evlist->entries))
return parse_cgroups(opt, str, unset);
trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);
return 0;
}
int cmd_trace(int argc, const char **argv)
{
const char *trace_usage[] = {
"perf trace [<options>] [<command>]",
"perf trace [<options>] -- <command> [<options>]",
"perf trace record [<options>] [<command>]",
"perf trace record [<options>] -- <command> [<options>]",
NULL
};
struct trace trace = {
.syscalls = {
. max = -1,
},
.opts = {
.target = {
.uid = UINT_MAX,
.uses_mmap = true,
},
.user_freq = UINT_MAX,
.user_interval = ULLONG_MAX,
.no_buffering = true,
.mmap_pages = UINT_MAX,
.proc_map_timeout = 500,
},
.output = stderr,
.show_comm = true,
.trace_syscalls = false,
.kernel_syscallchains = false,
.max_stack = UINT_MAX,
};
const char *output_name = NULL;
const struct option trace_options[] = {
OPT_CALLBACK('e', "event", &trace, "event",
"event/syscall selector. use 'perf list' to list available events",
trace__parse_events_option),
OPT_BOOLEAN(0, "comm", &trace.show_comm,
"show the thread COMM next to its id"),
OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),
OPT_CALLBACK(0, "expr", &trace, "expr", "list of syscalls/events to trace",
trace__parse_events_option),
OPT_STRING('o', "output", &output_name, "file", "output file name"),
OPT_STRING('i', "input", &input_name, "file", "Analyze events in file"),
OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
"trace events on existing process id"),
OPT_STRING('t', "tid", &trace.opts.target.tid, "tid",
"trace events on existing thread id"),
OPT_CALLBACK(0, "filter-pids", &trace, "CSV list of pids",
"pids to filter (by the kernel)", trace__set_filter_pids),
OPT_BOOLEAN('a', "all-cpus", &trace.opts.target.system_wide,
"system-wide collection from all CPUs"),
OPT_STRING('C', "cpu", &trace.opts.target.cpu_list, "cpu",
"list of cpus to monitor"),
OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
"child tasks do not inherit counters"),
OPT_CALLBACK('m', "mmap-pages", &trace.opts.mmap_pages, "pages",
"number of mmap data pages",
perf_evlist__parse_mmap_pages),
OPT_STRING('u', "uid", &trace.opts.target.uid_str, "user",
"user to profile"),
OPT_CALLBACK(0, "duration", &trace, "float",
"show only events with duration > N.M ms",
trace__set_duration),
OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
OPT_INCR('v', "verbose", &verbose, "be more verbose"),
OPT_BOOLEAN('T', "time", &trace.full_time,
"Show full timestamp, not time relative to first start"),
OPT_BOOLEAN(0, "failure", &trace.failure_only,
"Show only syscalls that failed"),
OPT_BOOLEAN('s', "summary", &trace.summary_only,
"Show only syscall summary with statistics"),
OPT_BOOLEAN('S', "with-summary", &trace.summary,
"Show all syscalls and summary with statistics"),
OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",
"Trace pagefaults", parse_pagefaults, "maj"),
OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),
OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"),
OPT_CALLBACK(0, "call-graph", &trace.opts,
"record_mode[,record_size]", record_callchain_help,
&record_parse_callchain_opt),
OPT_BOOLEAN(0, "kernel-syscall-graph", &trace.kernel_syscallchains,
"Show the kernel callchains on the syscall exit path"),
OPT_UINTEGER(0, "min-stack", &trace.min_stack,
"Set the minimum stack depth when parsing the callchain, "
"anything below the specified depth will be ignored."),
OPT_UINTEGER(0, "max-stack", &trace.max_stack,
"Set the maximum stack depth when parsing the callchain, "
"anything beyond the specified depth will be ignored. "
"Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
OPT_BOOLEAN(0, "print-sample", &trace.print_sample,
"print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
OPT_UINTEGER(0, "proc-map-timeout", &trace.opts.proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",
trace__parse_cgroups),
OPT_UINTEGER('D', "delay", &trace.opts.initial_delay,
"ms to wait before starting measurement after program "
"start"),
OPT_END()
};
bool __maybe_unused max_stack_user_set = true;
bool mmap_pages_user_set = true;
struct perf_evsel *evsel;
const char * const trace_subcommands[] = { "record", NULL };
int err = -1;
char bf[BUFSIZ];
signal(SIGSEGV, sighandler_dump_stack);
signal(SIGFPE, sighandler_dump_stack);
trace.evlist = perf_evlist__new();
trace.sctbl = syscalltbl__new();
if (trace.evlist == NULL || trace.sctbl == NULL) {
pr_err("Not enough memory to run!\n");
err = -ENOMEM;
goto out;
}
argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) {
usage_with_options_msg(trace_usage, trace_options,
"cgroup monitoring only available in system-wide mode");
}
evsel = bpf__setup_output_event(trace.evlist, "__augmented_syscalls__");
if (IS_ERR(evsel)) {
bpf__strerror_setup_output_event(trace.evlist, PTR_ERR(evsel), bf, sizeof(bf));
pr_err("ERROR: Setup trace syscalls enter failed: %s\n", bf);
goto out;
}
if (evsel) {
if (perf_evsel__init_augmented_syscall_tp(evsel) ||
perf_evsel__init_augmented_syscall_tp_args(evsel))
goto out;
trace.syscalls.events.augmented = evsel;
}
err = bpf__setup_stdout(trace.evlist);
if (err) {
bpf__strerror_setup_stdout(trace.evlist, err, bf, sizeof(bf));
pr_err("ERROR: Setup BPF stdout failed: %s\n", bf);
goto out;
}
err = -1;
if (trace.trace_pgfaults) {
trace.opts.sample_address = true;
trace.opts.sample_time = true;
}
if (trace.opts.mmap_pages == UINT_MAX)
mmap_pages_user_set = false;
if (trace.max_stack == UINT_MAX) {
trace.max_stack = input_name ? PERF_MAX_STACK_DEPTH : sysctl__max_stack();
max_stack_user_set = false;
}
#ifdef HAVE_DWARF_UNWIND_SUPPORT
if ((trace.min_stack || max_stack_user_set) && !callchain_param.enabled) {
record_opts__parse_callchain(&trace.opts, &callchain_param, "dwarf", false);
}
#endif
if (callchain_param.enabled) {
if (!mmap_pages_user_set && geteuid() == 0)
trace.opts.mmap_pages = perf_event_mlock_kb_in_pages() * 4;
symbol_conf.use_callchain = true;
}
if (trace.evlist->nr_entries > 0) {
evlist__set_evsel_handler(trace.evlist, trace__event_handler);
if (evlist__set_syscall_tp_fields(trace.evlist)) {
perror("failed to set syscalls:* tracepoint fields");
goto out;
}
}
if ((argc >= 1) && (strcmp(argv[0], "record") == 0))
return trace__record(&trace, argc-1, &argv[1]);
/* summary_only implies summary option, but don't overwrite summary if set */
if (trace.summary_only)
trace.summary = trace.summary_only;
if (!trace.trace_syscalls && !trace.trace_pgfaults &&
trace.evlist->nr_entries == 0 /* Was --events used? */) {
trace.trace_syscalls = true;
}
if (output_name != NULL) {
err = trace__open_output(&trace, output_name);
if (err < 0) {
perror("failed to create output file");
goto out;
}
}
err = target__validate(&trace.opts.target);
if (err) {
target__strerror(&trace.opts.target, err, bf, sizeof(bf));
fprintf(trace.output, "%s", bf);
goto out_close;
}
err = target__parse_uid(&trace.opts.target);
if (err) {
target__strerror(&trace.opts.target, err, bf, sizeof(bf));
fprintf(trace.output, "%s", bf);
goto out_close;
}
if (!argc && target__none(&trace.opts.target))
trace.opts.target.system_wide = true;
if (input_name)
err = trace__replay(&trace);
else
err = trace__run(&trace, argc, argv);
out_close:
if (output_name != NULL)
fclose(trace.output);
out:
return err;
}
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