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linux-next/tools/perf/builtin-trace.c
Zhouyi Zhou 8e50d384cc perf tools: Fixup mmap event consumption 
The tail position of the event buffer should only be modified after
actually use that event.

If not the event buffer could be invalid before use, and segment fault
occurs when invoking perf top -G.

Signed-off-by: Zhouyi Zhou <yizhouzhou@ict.ac.cn>
Cc: David Ahern <dsahern@gmail.com>
Cc: Zhouyi Zhou <yizhouzhou@ict.ac.cn>
Link: http://lkml.kernel.org/r/1382600613-32177-1-git-send-email-zhouzhouyi@gmail.com
[ Simplified the logic using exit gotos and renamed write_tail method to mmap_consume ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-10-28 16:06:00 -03:00

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#include <traceevent/event-parse.h>
#include "builtin.h"
#include "util/color.h"
#include "util/debug.h"
#include "util/evlist.h"
#include "util/machine.h"
#include "util/session.h"
#include "util/thread.h"
#include "util/parse-options.h"
#include "util/strlist.h"
#include "util/intlist.h"
#include "util/thread_map.h"
#include <libaudit.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <linux/futex.h>
/* For older distros: */
#ifndef MAP_STACK
# define MAP_STACK 0x20000
#endif
#ifndef MADV_HWPOISON
# define MADV_HWPOISON 100
#endif
#ifndef MADV_MERGEABLE
# define MADV_MERGEABLE 12
#endif
#ifndef MADV_UNMERGEABLE
# define MADV_UNMERGEABLE 13
#endif
static size_t syscall_arg__scnprintf_hex(char *bf, size_t size,
unsigned long arg,
u8 arg_idx __maybe_unused,
u8 *arg_mask __maybe_unused)
{
return scnprintf(bf, size, "%#lx", arg);
}
#define SCA_HEX syscall_arg__scnprintf_hex
static size_t syscall_arg__scnprintf_whence(char *bf, size_t size,
unsigned long arg,
u8 arg_idx __maybe_unused,
u8 *arg_mask __maybe_unused)
{
int whence = arg;
switch (whence) {
#define P_WHENCE(n) case SEEK_##n: return scnprintf(bf, size, #n)
P_WHENCE(SET);
P_WHENCE(CUR);
P_WHENCE(END);
#ifdef SEEK_DATA
P_WHENCE(DATA);
#endif
#ifdef SEEK_HOLE
P_WHENCE(HOLE);
#endif
#undef P_WHENCE
default: break;
}
return scnprintf(bf, size, "%#x", whence);
}
#define SCA_WHENCE syscall_arg__scnprintf_whence
static size_t syscall_arg__scnprintf_mmap_prot(char *bf, size_t size,
unsigned long arg,
u8 arg_idx __maybe_unused,
u8 *arg_mask __maybe_unused)
{
int printed = 0, prot = arg;
if (prot == PROT_NONE)
return scnprintf(bf, size, "NONE");
#define P_MMAP_PROT(n) \
if (prot & PROT_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
prot &= ~PROT_##n; \
}
P_MMAP_PROT(EXEC);
P_MMAP_PROT(READ);
P_MMAP_PROT(WRITE);
#ifdef PROT_SEM
P_MMAP_PROT(SEM);
#endif
P_MMAP_PROT(GROWSDOWN);
P_MMAP_PROT(GROWSUP);
#undef P_MMAP_PROT
if (prot)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", prot);
return printed;
}
#define SCA_MMAP_PROT syscall_arg__scnprintf_mmap_prot
static size_t syscall_arg__scnprintf_mmap_flags(char *bf, size_t size,
unsigned long arg, u8 arg_idx __maybe_unused,
u8 *arg_mask __maybe_unused)
{
int printed = 0, flags = arg;
#define P_MMAP_FLAG(n) \
if (flags & MAP_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
flags &= ~MAP_##n; \
}
P_MMAP_FLAG(SHARED);
P_MMAP_FLAG(PRIVATE);
#ifdef MAP_32BIT
P_MMAP_FLAG(32BIT);
#endif
P_MMAP_FLAG(ANONYMOUS);
P_MMAP_FLAG(DENYWRITE);
P_MMAP_FLAG(EXECUTABLE);
P_MMAP_FLAG(FILE);
P_MMAP_FLAG(FIXED);
P_MMAP_FLAG(GROWSDOWN);
#ifdef MAP_HUGETLB
P_MMAP_FLAG(HUGETLB);
#endif
P_MMAP_FLAG(LOCKED);
P_MMAP_FLAG(NONBLOCK);
P_MMAP_FLAG(NORESERVE);
P_MMAP_FLAG(POPULATE);
P_MMAP_FLAG(STACK);
#ifdef MAP_UNINITIALIZED
P_MMAP_FLAG(UNINITIALIZED);
#endif
#undef P_MMAP_FLAG
if (flags)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
return printed;
}
#define SCA_MMAP_FLAGS syscall_arg__scnprintf_mmap_flags
static size_t syscall_arg__scnprintf_madvise_behavior(char *bf, size_t size,
unsigned long arg, u8 arg_idx __maybe_unused,
u8 *arg_mask __maybe_unused)
{
int behavior = arg;
switch (behavior) {
#define P_MADV_BHV(n) case MADV_##n: return scnprintf(bf, size, #n)
P_MADV_BHV(NORMAL);
P_MADV_BHV(RANDOM);
P_MADV_BHV(SEQUENTIAL);
P_MADV_BHV(WILLNEED);
P_MADV_BHV(DONTNEED);
P_MADV_BHV(REMOVE);
P_MADV_BHV(DONTFORK);
P_MADV_BHV(DOFORK);
P_MADV_BHV(HWPOISON);
#ifdef MADV_SOFT_OFFLINE
P_MADV_BHV(SOFT_OFFLINE);
#endif
P_MADV_BHV(MERGEABLE);
P_MADV_BHV(UNMERGEABLE);
#ifdef MADV_HUGEPAGE
P_MADV_BHV(HUGEPAGE);
#endif
#ifdef MADV_NOHUGEPAGE
P_MADV_BHV(NOHUGEPAGE);
#endif
#ifdef MADV_DONTDUMP
P_MADV_BHV(DONTDUMP);
#endif
#ifdef MADV_DODUMP
P_MADV_BHV(DODUMP);
#endif
#undef P_MADV_PHV
default: break;
}
return scnprintf(bf, size, "%#x", behavior);
}
#define SCA_MADV_BHV syscall_arg__scnprintf_madvise_behavior
static size_t syscall_arg__scnprintf_futex_op(char *bf, size_t size, unsigned long arg,
u8 arg_idx __maybe_unused, u8 *arg_mask)
{
enum syscall_futex_args {
SCF_UADDR = (1 << 0),
SCF_OP = (1 << 1),
SCF_VAL = (1 << 2),
SCF_TIMEOUT = (1 << 3),
SCF_UADDR2 = (1 << 4),
SCF_VAL3 = (1 << 5),
};
int op = arg;
int cmd = op & FUTEX_CMD_MASK;
size_t printed = 0;
switch (cmd) {
#define P_FUTEX_OP(n) case FUTEX_##n: printed = scnprintf(bf, size, #n);
P_FUTEX_OP(WAIT); *arg_mask |= SCF_VAL3|SCF_UADDR2; break;
P_FUTEX_OP(WAKE); *arg_mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break;
P_FUTEX_OP(FD); *arg_mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break;
P_FUTEX_OP(REQUEUE); *arg_mask |= SCF_VAL3|SCF_TIMEOUT; break;
P_FUTEX_OP(CMP_REQUEUE); *arg_mask |= SCF_TIMEOUT; break;
P_FUTEX_OP(CMP_REQUEUE_PI); *arg_mask |= SCF_TIMEOUT; break;
P_FUTEX_OP(WAKE_OP); break;
P_FUTEX_OP(LOCK_PI); *arg_mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break;
P_FUTEX_OP(UNLOCK_PI); *arg_mask |= SCF_VAL3|SCF_UADDR2|SCF_TIMEOUT; break;
P_FUTEX_OP(TRYLOCK_PI); *arg_mask |= SCF_VAL3|SCF_UADDR2; break;
P_FUTEX_OP(WAIT_BITSET); *arg_mask |= SCF_UADDR2; break;
P_FUTEX_OP(WAKE_BITSET); *arg_mask |= SCF_UADDR2; break;
P_FUTEX_OP(WAIT_REQUEUE_PI); break;
default: printed = scnprintf(bf, size, "%#x", cmd); break;
}
if (op & FUTEX_PRIVATE_FLAG)
printed += scnprintf(bf + printed, size - printed, "|PRIV");
if (op & FUTEX_CLOCK_REALTIME)
printed += scnprintf(bf + printed, size - printed, "|CLKRT");
return printed;
}
#define SCA_FUTEX_OP syscall_arg__scnprintf_futex_op
static size_t syscall_arg__scnprintf_open_flags(char *bf, size_t size,
unsigned long arg,
u8 arg_idx, u8 *arg_mask)
{
int printed = 0, flags = arg;
if (!(flags & O_CREAT))
*arg_mask |= 1 << (arg_idx + 1); /* Mask the mode parm */
if (flags == 0)
return scnprintf(bf, size, "RDONLY");
#define P_FLAG(n) \
if (flags & O_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
flags &= ~O_##n; \
}
P_FLAG(APPEND);
P_FLAG(ASYNC);
P_FLAG(CLOEXEC);
P_FLAG(CREAT);
P_FLAG(DIRECT);
P_FLAG(DIRECTORY);
P_FLAG(EXCL);
P_FLAG(LARGEFILE);
P_FLAG(NOATIME);
P_FLAG(NOCTTY);
#ifdef O_NONBLOCK
P_FLAG(NONBLOCK);
#elif O_NDELAY
P_FLAG(NDELAY);
#endif
#ifdef O_PATH
P_FLAG(PATH);
#endif
P_FLAG(RDWR);
#ifdef O_DSYNC
if ((flags & O_SYNC) == O_SYNC)
printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", "SYNC");
else {
P_FLAG(DSYNC);
}
#else
P_FLAG(SYNC);
#endif
P_FLAG(TRUNC);
P_FLAG(WRONLY);
#undef P_FLAG
if (flags)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
return printed;
}
#define SCA_OPEN_FLAGS syscall_arg__scnprintf_open_flags
static struct syscall_fmt {
const char *name;
const char *alias;
size_t (*arg_scnprintf[6])(char *bf, size_t size, unsigned long arg, u8 arg_idx, u8 *arg_mask);
bool errmsg;
bool timeout;
bool hexret;
} syscall_fmts[] = {
{ .name = "access", .errmsg = true, },
{ .name = "arch_prctl", .errmsg = true, .alias = "prctl", },
{ .name = "brk", .hexret = true,
.arg_scnprintf = { [0] = SCA_HEX, /* brk */ }, },
{ .name = "mmap", .hexret = true, },
{ .name = "connect", .errmsg = true, },
{ .name = "fstat", .errmsg = true, .alias = "newfstat", },
{ .name = "fstatat", .errmsg = true, .alias = "newfstatat", },
{ .name = "futex", .errmsg = true,
.arg_scnprintf = { [1] = SCA_FUTEX_OP, /* op */ }, },
{ .name = "ioctl", .errmsg = true,
.arg_scnprintf = { [2] = SCA_HEX, /* arg */ }, },
{ .name = "lseek", .errmsg = true,
.arg_scnprintf = { [2] = SCA_WHENCE, /* whence */ }, },
{ .name = "lstat", .errmsg = true, .alias = "newlstat", },
{ .name = "madvise", .errmsg = true,
.arg_scnprintf = { [0] = SCA_HEX, /* start */
[2] = SCA_MADV_BHV, /* behavior */ }, },
{ .name = "mmap", .hexret = true,
.arg_scnprintf = { [0] = SCA_HEX, /* addr */
[2] = SCA_MMAP_PROT, /* prot */
[3] = SCA_MMAP_FLAGS, /* flags */ }, },
{ .name = "mprotect", .errmsg = true,
.arg_scnprintf = { [0] = SCA_HEX, /* start */
[2] = SCA_MMAP_PROT, /* prot */ }, },
{ .name = "mremap", .hexret = true,
.arg_scnprintf = { [0] = SCA_HEX, /* addr */
[4] = SCA_HEX, /* new_addr */ }, },
{ .name = "munmap", .errmsg = true,
.arg_scnprintf = { [0] = SCA_HEX, /* addr */ }, },
{ .name = "open", .errmsg = true,
.arg_scnprintf = { [1] = SCA_OPEN_FLAGS, /* flags */ }, },
{ .name = "open_by_handle_at", .errmsg = true,
.arg_scnprintf = { [2] = SCA_OPEN_FLAGS, /* flags */ }, },
{ .name = "openat", .errmsg = true,
.arg_scnprintf = { [2] = SCA_OPEN_FLAGS, /* flags */ }, },
{ .name = "poll", .errmsg = true, .timeout = true, },
{ .name = "ppoll", .errmsg = true, .timeout = true, },
{ .name = "pread", .errmsg = true, .alias = "pread64", },
{ .name = "pwrite", .errmsg = true, .alias = "pwrite64", },
{ .name = "read", .errmsg = true, },
{ .name = "recvfrom", .errmsg = true, },
{ .name = "select", .errmsg = true, .timeout = true, },
{ .name = "socket", .errmsg = true, },
{ .name = "stat", .errmsg = true, .alias = "newstat", },
{ .name = "uname", .errmsg = true, .alias = "newuname", },
};
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);
}
struct syscall {
struct event_format *tp_format;
const char *name;
bool filtered;
struct syscall_fmt *fmt;
size_t (**arg_scnprintf)(char *bf, size_t size,
unsigned long arg, u8 arg_idx, u8 *args_mask);
};
static size_t fprintf_duration(unsigned long t, FILE *fp)
{
double duration = (double)t / NSEC_PER_MSEC;
size_t printed = fprintf(fp, "(");
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, "): ");
}
struct thread_trace {
u64 entry_time;
u64 exit_time;
bool entry_pending;
unsigned long nr_events;
char *entry_str;
double runtime_ms;
};
static struct thread_trace *thread_trace__new(void)
{
return zalloc(sizeof(struct thread_trace));
}
static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
{
struct thread_trace *ttrace;
if (thread == NULL)
goto fail;
if (thread->priv == NULL)
thread->priv = thread_trace__new();
if (thread->priv == NULL)
goto fail;
ttrace = thread->priv;
++ttrace->nr_events;
return ttrace;
fail:
color_fprintf(fp, PERF_COLOR_RED,
"WARNING: not enough memory, dropping samples!\n");
return NULL;
}
struct trace {
struct perf_tool tool;
int audit_machine;
struct {
int max;
struct syscall *table;
} syscalls;
struct perf_record_opts opts;
struct machine host;
u64 base_time;
FILE *output;
unsigned long nr_events;
struct strlist *ev_qualifier;
bool not_ev_qualifier;
struct intlist *tid_list;
struct intlist *pid_list;
bool sched;
bool multiple_threads;
double duration_filter;
double runtime_ms;
};
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);
}
static bool done = false;
static void sig_handler(int sig __maybe_unused)
{
done = true;
}
static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
u64 duration, u64 tstamp, FILE *fp)
{
size_t printed = trace__fprintf_tstamp(trace, tstamp, fp);
printed += fprintf_duration(duration, fp);
if (trace->multiple_threads)
printed += fprintf(fp, "%d ", thread->tid);
return printed;
}
static int trace__process_event(struct trace *trace, struct machine *machine,
union perf_event *event)
{
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);
default:
ret = machine__process_event(machine, event);
break;
}
return ret;
}
static int trace__tool_process(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine)
{
struct trace *trace = container_of(tool, struct trace, tool);
return trace__process_event(trace, machine, event);
}
static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
{
int err = symbol__init();
if (err)
return err;
machine__init(&trace->host, "", HOST_KERNEL_ID);
machine__create_kernel_maps(&trace->host);
if (perf_target__has_task(&trace->opts.target)) {
err = perf_event__synthesize_thread_map(&trace->tool, evlist->threads,
trace__tool_process,
&trace->host);
} else {
err = perf_event__synthesize_threads(&trace->tool, trace__tool_process,
&trace->host);
}
if (err)
symbol__exit();
return err;
}
static int syscall__set_arg_fmts(struct syscall *sc)
{
struct format_field *field;
int idx = 0;
sc->arg_scnprintf = calloc(sc->tp_format->format.nr_fields - 1, sizeof(void *));
if (sc->arg_scnprintf == NULL)
return -1;
for (field = sc->tp_format->format.fields->next; field; field = field->next) {
if (sc->fmt && sc->fmt->arg_scnprintf[idx])
sc->arg_scnprintf[idx] = sc->fmt->arg_scnprintf[idx];
else if (field->flags & FIELD_IS_POINTER)
sc->arg_scnprintf[idx] = syscall_arg__scnprintf_hex;
++idx;
}
return 0;
}
static int trace__read_syscall_info(struct trace *trace, int id)
{
char tp_name[128];
struct syscall *sc;
const char *name = audit_syscall_to_name(id, trace->audit_machine);
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;
if (trace->ev_qualifier) {
bool in = strlist__find(trace->ev_qualifier, name) != NULL;
if (!(in ^ trace->not_ev_qualifier)) {
sc->filtered = true;
/*
* No need to do read tracepoint information since this will be
* filtered out.
*/
return 0;
}
}
sc->fmt = syscall_fmt__find(sc->name);
snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
sc->tp_format = event_format__new("syscalls", tp_name);
if (sc->tp_format == NULL && sc->fmt && sc->fmt->alias) {
snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
sc->tp_format = event_format__new("syscalls", tp_name);
}
if (sc->tp_format == NULL)
return -1;
return syscall__set_arg_fmts(sc);
}
static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
unsigned long *args)
{
int i = 0;
size_t printed = 0;
if (sc->tp_format != NULL) {
struct format_field *field;
u8 mask = 0, bit = 1;
for (field = sc->tp_format->format.fields->next; field;
field = field->next, ++i, bit <<= 1) {
if (mask & bit)
continue;
printed += scnprintf(bf + printed, size - printed,
"%s%s: ", printed ? ", " : "", field->name);
if (sc->arg_scnprintf && sc->arg_scnprintf[i]) {
printed += sc->arg_scnprintf[i](bf + printed, size - printed,
args[i], i, &mask);
} else {
printed += scnprintf(bf + printed, size - printed,
"%ld", args[i]);
}
}
} else {
while (i < 6) {
printed += scnprintf(bf + printed, size - printed,
"%sarg%d: %ld",
printed ? ", " : "", i, args[i]);
++i;
}
}
return printed;
}
typedef int (*tracepoint_handler)(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample);
static struct syscall *trace__syscall_info(struct trace *trace,
struct perf_evsel *evsel,
struct perf_sample *sample)
{
int id = perf_evsel__intval(evsel, sample, "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) {
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 int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample)
{
char *msg;
void *args;
size_t printed = 0;
struct thread *thread;
struct syscall *sc = trace__syscall_info(trace, evsel, sample);
struct thread_trace *ttrace;
if (sc == NULL)
return -1;
if (sc->filtered)
return 0;
thread = machine__findnew_thread(&trace->host, sample->pid,
sample->tid);
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
return -1;
args = perf_evsel__rawptr(evsel, sample, "args");
if (args == NULL) {
fprintf(trace->output, "Problems reading syscall arguments\n");
return -1;
}
ttrace = thread->priv;
if (ttrace->entry_str == NULL) {
ttrace->entry_str = malloc(1024);
if (!ttrace->entry_str)
return -1;
}
ttrace->entry_time = sample->time;
msg = ttrace->entry_str;
printed += scnprintf(msg + printed, 1024 - printed, "%s(", sc->name);
printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed, args);
if (!strcmp(sc->name, "exit_group") || !strcmp(sc->name, "exit")) {
if (!trace->duration_filter) {
trace__fprintf_entry_head(trace, thread, 1, sample->time, trace->output);
fprintf(trace->output, "%-70s\n", ttrace->entry_str);
}
} else
ttrace->entry_pending = true;
return 0;
}
static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample)
{
int ret;
u64 duration = 0;
struct thread *thread;
struct syscall *sc = trace__syscall_info(trace, evsel, sample);
struct thread_trace *ttrace;
if (sc == NULL)
return -1;
if (sc->filtered)
return 0;
thread = machine__findnew_thread(&trace->host, sample->pid,
sample->tid);
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
return -1;
ret = perf_evsel__intval(evsel, sample, "ret");
ttrace = thread->priv;
ttrace->exit_time = sample->time;
if (ttrace->entry_time) {
duration = sample->time - ttrace->entry_time;
if (trace__filter_duration(trace, duration))
goto out;
} else if (trace->duration_filter)
goto out;
trace__fprintf_entry_head(trace, thread, duration, sample->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) {
signed_print:
fprintf(trace->output, ") = %d", ret);
} else if (ret < 0 && sc->fmt->errmsg) {
char bf[256];
const char *emsg = strerror_r(-ret, bf, sizeof(bf)),
*e = audit_errno_to_name(-ret);
fprintf(trace->output, ") = -1 %s %s", e, emsg);
} else if (ret == 0 && sc->fmt->timeout)
fprintf(trace->output, ") = 0 Timeout");
else if (sc->fmt->hexret)
fprintf(trace->output, ") = %#x", ret);
else
goto signed_print;
fputc('\n', trace->output);
out:
ttrace->entry_pending = false;
return 0;
}
static int trace__sched_stat_runtime(struct trace *trace, struct perf_evsel *evsel,
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;
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"));
return 0;
}
static bool skip_sample(struct trace *trace, struct perf_sample *sample)
{
if ((trace->pid_list && intlist__find(trace->pid_list, sample->pid)) ||
(trace->tid_list && intlist__find(trace->tid_list, sample->tid)))
return false;
if (trace->pid_list || trace->tid_list)
return true;
return false;
}
static int trace__process_sample(struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine __maybe_unused)
{
struct trace *trace = container_of(tool, struct trace, tool);
int err = 0;
tracepoint_handler handler = evsel->handler.func;
if (skip_sample(trace, sample))
return 0;
if (trace->base_time == 0)
trace->base_time = sample->time;
if (handler)
handler(trace, evsel, sample);
return err;
}
static bool
perf_session__has_tp(struct perf_session *session, const char *name)
{
struct perf_evsel *evsel;
evsel = perf_evlist__find_tracepoint_by_name(session->evlist, name);
return evsel != NULL;
}
static int parse_target_str(struct trace *trace)
{
if (trace->opts.target.pid) {
trace->pid_list = intlist__new(trace->opts.target.pid);
if (trace->pid_list == NULL) {
pr_err("Error parsing process id string\n");
return -EINVAL;
}
}
if (trace->opts.target.tid) {
trace->tid_list = intlist__new(trace->opts.target.tid);
if (trace->tid_list == NULL) {
pr_err("Error parsing thread id string\n");
return -EINVAL;
}
}
return 0;
}
static int trace__run(struct trace *trace, int argc, const char **argv)
{
struct perf_evlist *evlist = perf_evlist__new();
struct perf_evsel *evsel;
int err = -1, i;
unsigned long before;
const bool forks = argc > 0;
if (evlist == NULL) {
fprintf(trace->output, "Not enough memory to run!\n");
goto out;
}
if (perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_enter", trace__sys_enter) ||
perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_exit", trace__sys_exit)) {
fprintf(trace->output, "Couldn't read the raw_syscalls tracepoints information!\n");
goto out_delete_evlist;
}
if (trace->sched &&
perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
trace__sched_stat_runtime)) {
fprintf(trace->output, "Couldn't read the sched_stat_runtime tracepoint information!\n");
goto out_delete_evlist;
}
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_maps;
}
perf_evlist__config(evlist, &trace->opts);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
if (forks) {
err = perf_evlist__prepare_workload(evlist, &trace->opts.target,
argv, false, false);
if (err < 0) {
fprintf(trace->output, "Couldn't run the workload!\n");
goto out_delete_maps;
}
}
err = perf_evlist__open(evlist);
if (err < 0) {
fprintf(trace->output, "Couldn't create the events: %s\n", strerror(errno));
goto out_delete_maps;
}
err = perf_evlist__mmap(evlist, UINT_MAX, false);
if (err < 0) {
fprintf(trace->output, "Couldn't mmap the events: %s\n", strerror(errno));
goto out_close_evlist;
}
perf_evlist__enable(evlist);
if (forks)
perf_evlist__start_workload(evlist);
trace->multiple_threads = evlist->threads->map[0] == -1 || evlist->threads->nr > 1;
again:
before = trace->nr_events;
for (i = 0; i < evlist->nr_mmaps; i++) {
union perf_event *event;
while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
const u32 type = event->header.type;
tracepoint_handler handler;
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;
}
if (trace->base_time == 0)
trace->base_time = sample.time;
if (type != PERF_RECORD_SAMPLE) {
trace__process_event(trace, &trace->host, event);
continue;
}
evsel = perf_evlist__id2evsel(evlist, sample.id);
if (evsel == NULL) {
fprintf(trace->output, "Unknown tp ID %" PRIu64 ", skipping...\n", sample.id);
goto next_event;
}
if (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);
goto next_event;
}
handler = evsel->handler.func;
handler(trace, evsel, &sample);
next_event:
perf_evlist__mmap_consume(evlist, i);
if (done)
goto out_unmap_evlist;
}
}
if (trace->nr_events == before) {
if (done)
goto out_unmap_evlist;
poll(evlist->pollfd, evlist->nr_fds, -1);
}
if (done)
perf_evlist__disable(evlist);
goto again;
out_unmap_evlist:
perf_evlist__munmap(evlist);
out_close_evlist:
perf_evlist__close(evlist);
out_delete_maps:
perf_evlist__delete_maps(evlist);
out_delete_evlist:
perf_evlist__delete(evlist);
out:
return err;
}
static int trace__replay(struct trace *trace)
{
const struct perf_evsel_str_handler handlers[] = {
{ "raw_syscalls:sys_enter", trace__sys_enter, },
{ "raw_syscalls:sys_exit", trace__sys_exit, },
};
struct perf_session *session;
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.ordered_samples = true;
trace->tool.ordering_requires_timestamps = true;
/* add tid to output */
trace->multiple_threads = true;
if (symbol__init() < 0)
return -1;
session = perf_session__new(input_name, O_RDONLY, 0, false,
&trace->tool);
if (session == NULL)
return -ENOMEM;
err = perf_session__set_tracepoints_handlers(session, handlers);
if (err)
goto out;
if (!perf_session__has_tp(session, "raw_syscalls:sys_enter")) {
pr_err("Data file does not have raw_syscalls:sys_enter events\n");
goto out;
}
if (!perf_session__has_tp(session, "raw_syscalls:sys_exit")) {
pr_err("Data file does not have raw_syscalls:sys_exit events\n");
goto out;
}
err = parse_target_str(trace);
if (err != 0)
goto out;
setup_pager();
err = perf_session__process_events(session, &trace->tool);
if (err)
pr_err("Failed to process events, error %d", err);
out:
perf_session__delete(session);
return err;
}
static size_t trace__fprintf_threads_header(FILE *fp)
{
size_t printed;
printed = fprintf(fp, "\n _____________________________________________________________________\n");
printed += fprintf(fp," __) Summary of events (__\n\n");
printed += fprintf(fp," [ task - pid ] [ events ] [ ratio ] [ runtime ]\n");
printed += fprintf(fp," _____________________________________________________________________\n\n");
return printed;
}
static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
{
size_t printed = trace__fprintf_threads_header(fp);
struct rb_node *nd;
for (nd = rb_first(&trace->host.threads); nd; nd = rb_next(nd)) {
struct thread *thread = rb_entry(nd, struct thread, rb_node);
struct thread_trace *ttrace = thread->priv;
const char *color;
double ratio;
if (ttrace == NULL)
continue;
ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
color = PERF_COLOR_NORMAL;
if (ratio > 50.0)
color = PERF_COLOR_RED;
else if (ratio > 25.0)
color = PERF_COLOR_GREEN;
else if (ratio > 5.0)
color = PERF_COLOR_YELLOW;
printed += color_fprintf(fp, color, "%20s", thread->comm);
printed += fprintf(fp, " - %-5d :%11lu [", thread->tid, ttrace->nr_events);
printed += color_fprintf(fp, color, "%5.1f%%", ratio);
printed += fprintf(fp, " ] %10.3f ms\n", ttrace->runtime_ms);
}
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__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;
}
int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
{
const char * const trace_usage[] = {
"perf trace [<options>] [<command>]",
"perf trace [<options>] -- <command> [<options>]",
NULL
};
struct trace trace = {
.audit_machine = audit_detect_machine(),
.syscalls = {
. max = -1,
},
.opts = {
.target = {
.uid = UINT_MAX,
.uses_mmap = true,
},
.user_freq = UINT_MAX,
.user_interval = ULLONG_MAX,
.no_delay = true,
.mmap_pages = 1024,
},
.output = stdout,
};
const char *output_name = NULL;
const char *ev_qualifier_str = NULL;
const struct option trace_options[] = {
OPT_STRING('e', "expr", &ev_qualifier_str, "expr",
"list of events to trace"),
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_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_UINTEGER('m', "mmap-pages", &trace.opts.mmap_pages,
"number of mmap data 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_END()
};
int err;
char bf[BUFSIZ];
argc = parse_options(argc, argv, trace_options, trace_usage, 0);
if (output_name != NULL) {
err = trace__open_output(&trace, output_name);
if (err < 0) {
perror("failed to create output file");
goto out;
}
}
if (ev_qualifier_str != NULL) {
const char *s = ev_qualifier_str;
trace.not_ev_qualifier = *s == '!';
if (trace.not_ev_qualifier)
++s;
trace.ev_qualifier = strlist__new(true, s);
if (trace.ev_qualifier == NULL) {
fputs("Not enough memory to parse event qualifier",
trace.output);
err = -ENOMEM;
goto out_close;
}
}
err = perf_target__validate(&trace.opts.target);
if (err) {
perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
fprintf(trace.output, "%s", bf);
goto out_close;
}
err = perf_target__parse_uid(&trace.opts.target);
if (err) {
perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
fprintf(trace.output, "%s", bf);
goto out_close;
}
if (!argc && perf_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);
if (trace.sched && !err)
trace__fprintf_thread_summary(&trace, trace.output);
out_close:
if (output_name != NULL)
fclose(trace.output);
out:
return err;
}
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