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linux/tools/perf/util/event.c

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// SPDX-License-Identifier: GPL-2.0
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
#include <api/fs/fs.h>
#include <linux/perf_event.h>
#include "event.h"
#include "debug.h"
#include "hist.h"
#include "machine.h"
#include "sort.h"
#include "string2.h"
#include "strlist.h"
#include "thread.h"
#include "thread_map.h"
#include "sane_ctype.h"
#include "symbol/kallsyms.h"
#include "asm/bug.h"
#include "stat.h"
static const char *perf_event__names[] = {
[0] = "TOTAL",
[PERF_RECORD_MMAP] = "MMAP",
[PERF_RECORD_MMAP2] = "MMAP2",
[PERF_RECORD_LOST] = "LOST",
[PERF_RECORD_COMM] = "COMM",
[PERF_RECORD_EXIT] = "EXIT",
[PERF_RECORD_THROTTLE] = "THROTTLE",
[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
[PERF_RECORD_FORK] = "FORK",
[PERF_RECORD_READ] = "READ",
[PERF_RECORD_SAMPLE] = "SAMPLE",
[PERF_RECORD_AUX] = "AUX",
[PERF_RECORD_ITRACE_START] = "ITRACE_START",
[PERF_RECORD_LOST_SAMPLES] = "LOST_SAMPLES",
[PERF_RECORD_SWITCH] = "SWITCH",
[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
[PERF_RECORD_NAMESPACES] = "NAMESPACES",
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
[PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
[PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
[PERF_RECORD_ID_INDEX] = "ID_INDEX",
[PERF_RECORD_AUXTRACE_INFO] = "AUXTRACE_INFO",
[PERF_RECORD_AUXTRACE] = "AUXTRACE",
[PERF_RECORD_AUXTRACE_ERROR] = "AUXTRACE_ERROR",
[PERF_RECORD_THREAD_MAP] = "THREAD_MAP",
[PERF_RECORD_CPU_MAP] = "CPU_MAP",
[PERF_RECORD_STAT_CONFIG] = "STAT_CONFIG",
[PERF_RECORD_STAT] = "STAT",
[PERF_RECORD_STAT_ROUND] = "STAT_ROUND",
[PERF_RECORD_EVENT_UPDATE] = "EVENT_UPDATE",
[PERF_RECORD_TIME_CONV] = "TIME_CONV",
[PERF_RECORD_HEADER_FEATURE] = "FEATURE",
};
static const char *perf_ns__names[] = {
[NET_NS_INDEX] = "net",
[UTS_NS_INDEX] = "uts",
[IPC_NS_INDEX] = "ipc",
[PID_NS_INDEX] = "pid",
[USER_NS_INDEX] = "user",
[MNT_NS_INDEX] = "mnt",
[CGROUP_NS_INDEX] = "cgroup",
};
const char *perf_event__name(unsigned int id)
{
if (id >= ARRAY_SIZE(perf_event__names))
return "INVALID";
if (!perf_event__names[id])
return "UNKNOWN";
return perf_event__names[id];
}
static const char *perf_ns__name(unsigned int id)
{
if (id >= ARRAY_SIZE(perf_ns__names))
return "UNKNOWN";
return perf_ns__names[id];
}
static int perf_tool__process_synth_event(struct perf_tool *tool,
union perf_event *event,
struct machine *machine,
perf_event__handler_t process)
{
struct perf_sample synth_sample = {
.pid = -1,
.tid = -1,
.time = -1,
.stream_id = -1,
.cpu = -1,
.period = 1,
.cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
};
return process(tool, event, &synth_sample, machine);
};
/*
* Assumes that the first 4095 bytes of /proc/pid/stat contains
* the comm, tgid and ppid.
*/
static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
pid_t *tgid, pid_t *ppid)
{
char filename[PATH_MAX];
char bf[4096];
int fd;
size_t size = 0;
ssize_t n;
char *name, *tgids, *ppids;
*tgid = -1;
*ppid = -1;
snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
fd = open(filename, O_RDONLY);
if (fd < 0) {
pr_debug("couldn't open %s\n", filename);
return -1;
}
n = read(fd, bf, sizeof(bf) - 1);
close(fd);
if (n <= 0) {
pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
pid);
return -1;
}
bf[n] = '\0';
name = strstr(bf, "Name:");
tgids = strstr(bf, "Tgid:");
ppids = strstr(bf, "PPid:");
if (name) {
char *nl;
name += 5; /* strlen("Name:") */
name = ltrim(name);
nl = strchr(name, '\n');
if (nl)
*nl = '\0';
size = strlen(name);
if (size >= len)
size = len - 1;
memcpy(comm, name, size);
comm[size] = '\0';
} else {
pr_debug("Name: string not found for pid %d\n", pid);
}
if (tgids) {
tgids += 5; /* strlen("Tgid:") */
*tgid = atoi(tgids);
} else {
pr_debug("Tgid: string not found for pid %d\n", pid);
}
if (ppids) {
ppids += 5; /* strlen("PPid:") */
*ppid = atoi(ppids);
} else {
pr_debug("PPid: string not found for pid %d\n", pid);
}
return 0;
}
static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
struct machine *machine,
pid_t *tgid, pid_t *ppid)
{
size_t size;
*ppid = -1;
memset(&event->comm, 0, sizeof(event->comm));
if (machine__is_host(machine)) {
if (perf_event__get_comm_ids(pid, event->comm.comm,
sizeof(event->comm.comm),
tgid, ppid) != 0) {
return -1;
}
} else {
*tgid = machine->pid;
}
if (*tgid < 0)
return -1;
event->comm.pid = *tgid;
event->comm.header.type = PERF_RECORD_COMM;
size = strlen(event->comm.comm) + 1;
size = PERF_ALIGN(size, sizeof(u64));
memset(event->comm.comm + size, 0, machine->id_hdr_size);
event->comm.header.size = (sizeof(event->comm) -
(sizeof(event->comm.comm) - size) +
machine->id_hdr_size);
event->comm.tid = pid;
return 0;
}
pid_t perf_event__synthesize_comm(struct perf_tool *tool,
union perf_event *event, pid_t pid,
perf_event__handler_t process,
struct machine *machine)
{
pid_t tgid, ppid;
if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
return -1;
if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
return -1;
return tgid;
}
static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
struct perf_ns_link_info *ns_link_info)
{
struct stat64 st;
char proc_ns[128];
sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
if (stat64(proc_ns, &st) == 0) {
ns_link_info->dev = st.st_dev;
ns_link_info->ino = st.st_ino;
}
}
int perf_event__synthesize_namespaces(struct perf_tool *tool,
union perf_event *event,
pid_t pid, pid_t tgid,
perf_event__handler_t process,
struct machine *machine)
{
u32 idx;
struct perf_ns_link_info *ns_link_info;
if (!tool || !tool->namespace_events)
return 0;
memset(&event->namespaces, 0, (sizeof(event->namespaces) +
(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
machine->id_hdr_size));
event->namespaces.pid = tgid;
event->namespaces.tid = pid;
event->namespaces.nr_namespaces = NR_NAMESPACES;
ns_link_info = event->namespaces.link_info;
for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
perf_event__get_ns_link_info(pid, perf_ns__name(idx),
&ns_link_info[idx]);
event->namespaces.header.type = PERF_RECORD_NAMESPACES;
event->namespaces.header.size = (sizeof(event->namespaces) +
(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
machine->id_hdr_size);
if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
return -1;
return 0;
}
static int perf_event__synthesize_fork(struct perf_tool *tool,
union perf_event *event,
pid_t pid, pid_t tgid, pid_t ppid,
perf_event__handler_t process,
struct machine *machine)
{
memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
/*
* for main thread set parent to ppid from status file. For other
* threads set parent pid to main thread. ie., assume main thread
* spawns all threads in a process
*/
if (tgid == pid) {
event->fork.ppid = ppid;
event->fork.ptid = ppid;
} else {
event->fork.ppid = tgid;
event->fork.ptid = tgid;
}
event->fork.pid = tgid;
event->fork.tid = pid;
event->fork.header.type = PERF_RECORD_FORK;
event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
return -1;
return 0;
}
int perf_event__synthesize_mmap_events(struct perf_tool *tool,
union perf_event *event,
pid_t pid, pid_t tgid,
perf_event__handler_t process,
struct machine *machine,
bool mmap_data,
unsigned int proc_map_timeout)
{
char filename[PATH_MAX];
FILE *fp;
unsigned long long t;
bool truncation = false;
unsigned long long timeout = proc_map_timeout * 1000000ULL;
int rc = 0;
const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
if (machine__is_default_guest(machine))
return 0;
snprintf(filename, sizeof(filename), "%s/proc/%d/task/%d/maps",
machine->root_dir, pid, pid);
fp = fopen(filename, "r");
if (fp == NULL) {
/*
* We raced with a task exiting - just return:
*/
pr_debug("couldn't open %s\n", filename);
return -1;
}
event->header.type = PERF_RECORD_MMAP2;
t = rdclock();
while (1) {
char bf[BUFSIZ];
char prot[5];
char execname[PATH_MAX];
char anonstr[] = "//anon";
unsigned int ino;
size_t size;
ssize_t n;
if (fgets(bf, sizeof(bf), fp) == NULL)
break;
if ((rdclock() - t) > timeout) {
pr_warning("Reading %s time out. "
"You may want to increase "
"the time limit by --proc-map-timeout\n",
filename);
truncation = true;
goto out;
}
/* ensure null termination since stack will be reused. */
strcpy(execname, "");
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %[^\n]\n",
&event->mmap2.start, &event->mmap2.len, prot,
&event->mmap2.pgoff, &event->mmap2.maj,
&event->mmap2.min,
&ino, execname);
/*
* Anon maps don't have the execname.
*/
if (n < 7)
continue;
event->mmap2.ino = (u64)ino;
/*
* Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
*/
if (machine__is_host(machine))
event->header.misc = PERF_RECORD_MISC_USER;
else
event->header.misc = PERF_RECORD_MISC_GUEST_USER;
/* map protection and flags bits */
event->mmap2.prot = 0;
event->mmap2.flags = 0;
if (prot[0] == 'r')
event->mmap2.prot |= PROT_READ;
if (prot[1] == 'w')
event->mmap2.prot |= PROT_WRITE;
if (prot[2] == 'x')
event->mmap2.prot |= PROT_EXEC;
if (prot[3] == 's')
event->mmap2.flags |= MAP_SHARED;
else
event->mmap2.flags |= MAP_PRIVATE;
if (prot[2] != 'x') {
if (!mmap_data || prot[0] != 'r')
continue;
event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
}
out:
if (truncation)
event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
if (!strcmp(execname, ""))
strcpy(execname, anonstr);
if (hugetlbfs_mnt_len &&
!strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
strcpy(execname, anonstr);
event->mmap2.flags |= MAP_HUGETLB;
}
size = strlen(execname) + 1;
memcpy(event->mmap2.filename, execname, size);
size = PERF_ALIGN(size, sizeof(u64));
event->mmap2.len -= event->mmap.start;
event->mmap2.header.size = (sizeof(event->mmap2) -
(sizeof(event->mmap2.filename) - size));
memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
event->mmap2.header.size += machine->id_hdr_size;
event->mmap2.pid = tgid;
event->mmap2.tid = pid;
if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
rc = -1;
break;
}
if (truncation)
break;
}
fclose(fp);
return rc;
}
int perf_event__synthesize_modules(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
int rc = 0;
struct map *pos;
struct map_groups *kmaps = &machine->kmaps;
struct maps *maps = &kmaps->maps[MAP__FUNCTION];
union perf_event *event = zalloc((sizeof(event->mmap) +
machine->id_hdr_size));
if (event == NULL) {
pr_debug("Not enough memory synthesizing mmap event "
"for kernel modules\n");
return -1;
}
event->header.type = PERF_RECORD_MMAP;
/*
* kernel uses 0 for user space maps, see kernel/perf_event.c
* __perf_event_mmap
*/
if (machine__is_host(machine))
event->header.misc = PERF_RECORD_MISC_KERNEL;
else
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
for (pos = maps__first(maps); pos; pos = map__next(pos)) {
size_t size;
if (__map__is_kernel(pos))
continue;
size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
event->mmap.header.type = PERF_RECORD_MMAP;
event->mmap.header.size = (sizeof(event->mmap) -
(sizeof(event->mmap.filename) - size));
memset(event->mmap.filename + size, 0, machine->id_hdr_size);
event->mmap.header.size += machine->id_hdr_size;
event->mmap.start = pos->start;
event->mmap.len = pos->end - pos->start;
event->mmap.pid = machine->pid;
memcpy(event->mmap.filename, pos->dso->long_name,
pos->dso->long_name_len + 1);
if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
rc = -1;
break;
}
}
free(event);
return rc;
}
static int __event__synthesize_thread(union perf_event *comm_event,
union perf_event *mmap_event,
union perf_event *fork_event,
union perf_event *namespaces_event,
pid_t pid, int full,
perf_event__handler_t process,
struct perf_tool *tool,
struct machine *machine,
bool mmap_data,
unsigned int proc_map_timeout)
{
char filename[PATH_MAX];
DIR *tasks;
struct dirent *dirent;
pid_t tgid, ppid;
int rc = 0;
/* special case: only send one comm event using passed in pid */
if (!full) {
tgid = perf_event__synthesize_comm(tool, comm_event, pid,
process, machine);
if (tgid == -1)
return -1;
if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
tgid, process, machine) < 0)
return -1;
return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
process, machine, mmap_data,
proc_map_timeout);
}
if (machine__is_default_guest(machine))
return 0;
snprintf(filename, sizeof(filename), "%s/proc/%d/task",
machine->root_dir, pid);
tasks = opendir(filename);
if (tasks == NULL) {
pr_debug("couldn't open %s\n", filename);
return 0;
}
while ((dirent = readdir(tasks)) != NULL) {
char *end;
pid_t _pid;
_pid = strtol(dirent->d_name, &end, 10);
if (*end)
continue;
rc = -1;
if (perf_event__prepare_comm(comm_event, _pid, machine,
&tgid, &ppid) != 0)
break;
if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
ppid, process, machine) < 0)
break;
if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
tgid, process, machine) < 0)
break;
/*
* Send the prepared comm event
*/
if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
break;
rc = 0;
if (_pid == pid) {
/* process the parent's maps too */
rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
process, machine, mmap_data, proc_map_timeout);
if (rc)
break;
}
}
closedir(tasks);
return rc;
}
int perf_event__synthesize_thread_map(struct perf_tool *tool,
struct thread_map *threads,
perf_event__handler_t process,
struct machine *machine,
bool mmap_data,
unsigned int proc_map_timeout)
{
union perf_event *comm_event, *mmap_event, *fork_event;
union perf_event *namespaces_event;
int err = -1, thread, j;
comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
if (comm_event == NULL)
goto out;
mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
if (mmap_event == NULL)
goto out_free_comm;
fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
if (fork_event == NULL)
goto out_free_mmap;
namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
machine->id_hdr_size);
if (namespaces_event == NULL)
goto out_free_fork;
err = 0;
for (thread = 0; thread < threads->nr; ++thread) {
if (__event__synthesize_thread(comm_event, mmap_event,
fork_event, namespaces_event,
thread_map__pid(threads, thread), 0,
process, tool, machine,
mmap_data, proc_map_timeout)) {
err = -1;
break;
}
/*
* comm.pid is set to thread group id by
* perf_event__synthesize_comm
*/
if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
bool need_leader = true;
/* is thread group leader in thread_map? */
for (j = 0; j < threads->nr; ++j) {
if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
need_leader = false;
break;
}
}
/* if not, generate events for it */
if (need_leader &&
__event__synthesize_thread(comm_event, mmap_event,
fork_event, namespaces_event,
comm_event->comm.pid, 0,
process, tool, machine,
mmap_data, proc_map_timeout)) {
err = -1;
break;
}
}
}
free(namespaces_event);
out_free_fork:
free(fork_event);
out_free_mmap:
free(mmap_event);
out_free_comm:
free(comm_event);
out:
return err;
}
static int __perf_event__synthesize_threads(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine,
bool mmap_data,
unsigned int proc_map_timeout,
struct dirent **dirent,
int start,
int num)
{
union perf_event *comm_event, *mmap_event, *fork_event;
union perf_event *namespaces_event;
int err = -1;
char *end;
pid_t pid;
int i;
comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
if (comm_event == NULL)
goto out;
mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
if (mmap_event == NULL)
goto out_free_comm;
fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
if (fork_event == NULL)
goto out_free_mmap;
namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
machine->id_hdr_size);
if (namespaces_event == NULL)
goto out_free_fork;
for (i = start; i < start + num; i++) {
if (!isdigit(dirent[i]->d_name[0]))
continue;
pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
/* only interested in proper numerical dirents */
if (*end)
continue;
/*
* We may race with exiting thread, so don't stop just because
* one thread couldn't be synthesized.
*/
__event__synthesize_thread(comm_event, mmap_event, fork_event,
namespaces_event, pid, 1, process,
tool, machine, mmap_data,
proc_map_timeout);
}
err = 0;
free(namespaces_event);
out_free_fork:
free(fork_event);
out_free_mmap:
free(mmap_event);
out_free_comm:
free(comm_event);
out:
return err;
}
struct synthesize_threads_arg {
struct perf_tool *tool;
perf_event__handler_t process;
struct machine *machine;
bool mmap_data;
unsigned int proc_map_timeout;
struct dirent **dirent;
int num;
int start;
};
static void *synthesize_threads_worker(void *arg)
{
struct synthesize_threads_arg *args = arg;
__perf_event__synthesize_threads(args->tool, args->process,
args->machine, args->mmap_data,
args->proc_map_timeout, args->dirent,
args->start, args->num);
return NULL;
}
int perf_event__synthesize_threads(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine,
bool mmap_data,
unsigned int proc_map_timeout,
unsigned int nr_threads_synthesize)
{
struct synthesize_threads_arg *args = NULL;
pthread_t *synthesize_threads = NULL;
char proc_path[PATH_MAX];
struct dirent **dirent;
int num_per_thread;
int m, n, i, j;
int thread_nr;
int base = 0;
int err = -1;
if (machine__is_default_guest(machine))
return 0;
snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
n = scandir(proc_path, &dirent, 0, alphasort);
if (n < 0)
return err;
if (nr_threads_synthesize == UINT_MAX)
thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
else
thread_nr = nr_threads_synthesize;
if (thread_nr <= 1) {
err = __perf_event__synthesize_threads(tool, process,
machine, mmap_data,
proc_map_timeout,
dirent, base, n);
goto free_dirent;
}
if (thread_nr > n)
thread_nr = n;
synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
if (synthesize_threads == NULL)
goto free_dirent;
args = calloc(sizeof(*args), thread_nr);
if (args == NULL)
goto free_threads;
num_per_thread = n / thread_nr;
m = n % thread_nr;
for (i = 0; i < thread_nr; i++) {
args[i].tool = tool;
args[i].process = process;
args[i].machine = machine;
args[i].mmap_data = mmap_data;
args[i].proc_map_timeout = proc_map_timeout;
args[i].dirent = dirent;
}
for (i = 0; i < m; i++) {
args[i].num = num_per_thread + 1;
args[i].start = i * args[i].num;
}
if (i != 0)
base = args[i-1].start + args[i-1].num;
for (j = i; j < thread_nr; j++) {
args[j].num = num_per_thread;
args[j].start = base + (j - i) * args[i].num;
}
for (i = 0; i < thread_nr; i++) {
if (pthread_create(&synthesize_threads[i], NULL,
synthesize_threads_worker, &args[i]))
goto out_join;
}
err = 0;
out_join:
for (i = 0; i < thread_nr; i++)
pthread_join(synthesize_threads[i], NULL);
free(args);
free_threads:
free(synthesize_threads);
free_dirent:
for (i = 0; i < n; i++)
free(dirent[i]);
free(dirent);
return err;
}
struct process_symbol_args {
const char *name;
u64 start;
};
static int find_symbol_cb(void *arg, const char *name, char type,
u64 start)
{
struct process_symbol_args *args = arg;
/*
* Must be a function or at least an alias, as in PARISC64, where "_text" is
* an 'A' to the same address as "_stext".
*/
if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
type == 'A') || strcmp(name, args->name))
return 0;
args->start = start;
return 1;
}
int kallsyms__get_function_start(const char *kallsyms_filename,
const char *symbol_name, u64 *addr)
{
struct process_symbol_args args = { .name = symbol_name, };
if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
return -1;
*addr = args.start;
return 0;
}
int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
size_t size;
struct map *map = machine__kernel_map(machine);
struct kmap *kmap;
int err;
union perf_event *event;
if (symbol_conf.kptr_restrict)
return -1;
if (map == NULL)
return -1;
/*
* We should get this from /sys/kernel/sections/.text, but till that is
* available use this, and after it is use this as a fallback for older
* kernels.
*/
event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
if (event == NULL) {
pr_debug("Not enough memory synthesizing mmap event "
"for kernel modules\n");
return -1;
}
if (machine__is_host(machine)) {
/*
* kernel uses PERF_RECORD_MISC_USER for user space maps,
* see kernel/perf_event.c __perf_event_mmap
*/
event->header.misc = PERF_RECORD_MISC_KERNEL;
} else {
event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
}
kmap = map__kmap(map);
size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
size = PERF_ALIGN(size, sizeof(u64));
event->mmap.header.type = PERF_RECORD_MMAP;
event->mmap.header.size = (sizeof(event->mmap) -
(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
event->mmap.pgoff = kmap->ref_reloc_sym->addr;
event->mmap.start = map->start;
event->mmap.len = map->end - event->mmap.start;
event->mmap.pid = machine->pid;
err = perf_tool__process_synth_event(tool, event, machine, process);
free(event);
return err;
}
int perf_event__synthesize_thread_map2(struct perf_tool *tool,
struct thread_map *threads,
perf_event__handler_t process,
struct machine *machine)
{
union perf_event *event;
int i, err, size;
size = sizeof(event->thread_map);
size += threads->nr * sizeof(event->thread_map.entries[0]);
event = zalloc(size);
if (!event)
return -ENOMEM;
event->header.type = PERF_RECORD_THREAD_MAP;
event->header.size = size;
event->thread_map.nr = threads->nr;
for (i = 0; i < threads->nr; i++) {
struct thread_map_event_entry *entry = &event->thread_map.entries[i];
char *comm = thread_map__comm(threads, i);
if (!comm)
comm = (char *) "";
entry->pid = thread_map__pid(threads, i);
strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
}
err = process(tool, event, NULL, machine);
free(event);
return err;
}
static void synthesize_cpus(struct cpu_map_entries *cpus,
struct cpu_map *map)
{
int i;
cpus->nr = map->nr;
for (i = 0; i < map->nr; i++)
cpus->cpu[i] = map->map[i];
}
static void synthesize_mask(struct cpu_map_mask *mask,
struct cpu_map *map, int max)
{
int i;
mask->nr = BITS_TO_LONGS(max);
mask->long_size = sizeof(long);
for (i = 0; i < map->nr; i++)
set_bit(map->map[i], mask->mask);
}
static size_t cpus_size(struct cpu_map *map)
{
return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
}
static size_t mask_size(struct cpu_map *map, int *max)
{
int i;
*max = 0;
for (i = 0; i < map->nr; i++) {
/* bit possition of the cpu is + 1 */
int bit = map->map[i] + 1;
if (bit > *max)
*max = bit;
}
return sizeof(struct cpu_map_mask) + BITS_TO_LONGS(*max) * sizeof(long);
}
void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max)
{
size_t size_cpus, size_mask;
bool is_dummy = cpu_map__empty(map);
/*
* Both array and mask data have variable size based
* on the number of cpus and their actual values.
* The size of the 'struct cpu_map_data' is:
*
* array = size of 'struct cpu_map_entries' +
* number of cpus * sizeof(u64)
*
* mask = size of 'struct cpu_map_mask' +
* maximum cpu bit converted to size of longs
*
* and finaly + the size of 'struct cpu_map_data'.
*/
size_cpus = cpus_size(map);
size_mask = mask_size(map, max);
if (is_dummy || (size_cpus < size_mask)) {
*size += size_cpus;
*type = PERF_CPU_MAP__CPUS;
} else {
*size += size_mask;
*type = PERF_CPU_MAP__MASK;
}
*size += sizeof(struct cpu_map_data);
return zalloc(*size);
}
void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map,
u16 type, int max)
{
data->type = type;
switch (type) {
case PERF_CPU_MAP__CPUS:
synthesize_cpus((struct cpu_map_entries *) data->data, map);
break;
case PERF_CPU_MAP__MASK:
synthesize_mask((struct cpu_map_mask *) data->data, map, max);
default:
break;
};
}
static struct cpu_map_event* cpu_map_event__new(struct cpu_map *map)
{
size_t size = sizeof(struct cpu_map_event);
struct cpu_map_event *event;
int max;
u16 type;
event = cpu_map_data__alloc(map, &size, &type, &max);
if (!event)
return NULL;
event->header.type = PERF_RECORD_CPU_MAP;
event->header.size = size;
event->data.type = type;
cpu_map_data__synthesize(&event->data, map, type, max);
return event;
}
int perf_event__synthesize_cpu_map(struct perf_tool *tool,
struct cpu_map *map,
perf_event__handler_t process,
struct machine *machine)
{
struct cpu_map_event *event;
int err;
event = cpu_map_event__new(map);
if (!event)
return -ENOMEM;
err = process(tool, (union perf_event *) event, NULL, machine);
free(event);
return err;
}
int perf_event__synthesize_stat_config(struct perf_tool *tool,
struct perf_stat_config *config,
perf_event__handler_t process,
struct machine *machine)
{
struct stat_config_event *event;
int size, i = 0, err;
size = sizeof(*event);
size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
event = zalloc(size);
if (!event)
return -ENOMEM;
event->header.type = PERF_RECORD_STAT_CONFIG;
event->header.size = size;
event->nr = PERF_STAT_CONFIG_TERM__MAX;
#define ADD(__term, __val) \
event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \
event->data[i].val = __val; \
i++;
ADD(AGGR_MODE, config->aggr_mode)
ADD(INTERVAL, config->interval)
ADD(SCALE, config->scale)
WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
"stat config terms unbalanced\n");
#undef ADD
err = process(tool, (union perf_event *) event, NULL, machine);
free(event);
return err;
}
int perf_event__synthesize_stat(struct perf_tool *tool,
u32 cpu, u32 thread, u64 id,
struct perf_counts_values *count,
perf_event__handler_t process,
struct machine *machine)
{
struct stat_event event;
event.header.type = PERF_RECORD_STAT;
event.header.size = sizeof(event);
event.header.misc = 0;
event.id = id;
event.cpu = cpu;
event.thread = thread;
event.val = count->val;
event.ena = count->ena;
event.run = count->run;
return process(tool, (union perf_event *) &event, NULL, machine);
}
int perf_event__synthesize_stat_round(struct perf_tool *tool,
u64 evtime, u64 type,
perf_event__handler_t process,
struct machine *machine)
{
struct stat_round_event event;
event.header.type = PERF_RECORD_STAT_ROUND;
event.header.size = sizeof(event);
event.header.misc = 0;
event.time = evtime;
event.type = type;
return process(tool, (union perf_event *) &event, NULL, machine);
}
void perf_event__read_stat_config(struct perf_stat_config *config,
struct stat_config_event *event)
{
unsigned i;
for (i = 0; i < event->nr; i++) {
switch (event->data[i].tag) {
#define CASE(__term, __val) \
case PERF_STAT_CONFIG_TERM__##__term: \
config->__val = event->data[i].val; \
break;
CASE(AGGR_MODE, aggr_mode)
CASE(SCALE, scale)
CASE(INTERVAL, interval)
#undef CASE
default:
pr_warning("unknown stat config term %" PRIu64 "\n",
event->data[i].tag);
}
}
}
size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
{
const char *s;
if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
s = " exec";
else
s = "";
return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
}
size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp)
{
size_t ret = 0;
struct perf_ns_link_info *ns_link_info;
u32 nr_namespaces, idx;
ns_link_info = event->namespaces.link_info;
nr_namespaces = event->namespaces.nr_namespaces;
ret += fprintf(fp, " %d/%d - nr_namespaces: %u\n\t\t[",
event->namespaces.pid,
event->namespaces.tid,
nr_namespaces);
for (idx = 0; idx < nr_namespaces; idx++) {
if (idx && (idx % 4 == 0))
ret += fprintf(fp, "\n\t\t ");
ret += fprintf(fp, "%u/%s: %" PRIu64 "/%#" PRIx64 "%s", idx,
perf_ns__name(idx), (u64)ns_link_info[idx].dev,
(u64)ns_link_info[idx].ino,
((idx + 1) != nr_namespaces) ? ", " : "]\n");
}
return ret;
}
int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_comm_event(machine, event, sample);
}
int perf_event__process_namespaces(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_namespaces_event(machine, event, sample);
}
int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_lost_event(machine, event, sample);
}
int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine)
{
return machine__process_aux_event(machine, event);
}
int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine)
{
return machine__process_itrace_start_event(machine, event);
}
int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_lost_samples_event(machine, event, sample);
}
int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine)
{
return machine__process_switch_event(machine, event);
}
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
{
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
event->mmap.pid, event->mmap.tid, event->mmap.start,
event->mmap.len, event->mmap.pgoff,
(event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
event->mmap.filename);
}
size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
{
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
" %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
event->mmap2.min, event->mmap2.ino,
event->mmap2.ino_generation,
(event->mmap2.prot & PROT_READ) ? 'r' : '-',
(event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
(event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
(event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
event->mmap2.filename);
}
size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp)
{
struct thread_map *threads = thread_map__new_event(&event->thread_map);
size_t ret;
ret = fprintf(fp, " nr: ");
if (threads)
ret += thread_map__fprintf(threads, fp);
else
ret += fprintf(fp, "failed to get threads from event\n");
thread_map__put(threads);
return ret;
}
size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp)
{
struct cpu_map *cpus = cpu_map__new_data(&event->cpu_map.data);
size_t ret;
ret = fprintf(fp, ": ");
if (cpus)
ret += cpu_map__fprintf(cpus, fp);
else
ret += fprintf(fp, "failed to get cpumap from event\n");
cpu_map__put(cpus);
return ret;
}
int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_mmap_event(machine, event, sample);
}
int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_mmap2_event(machine, event, sample);
}
size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
{
return fprintf(fp, "(%d:%d):(%d:%d)\n",
event->fork.pid, event->fork.tid,
event->fork.ppid, event->fork.ptid);
}
int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_fork_event(machine, event, sample);
}
int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_exit_event(machine, event, sample);
}
size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
{
return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s%s]\n",
event->aux.aux_offset, event->aux.aux_size,
event->aux.flags,
event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "",
event->aux.flags & PERF_AUX_FLAG_PARTIAL ? "P" : "");
}
size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
{
return fprintf(fp, " pid: %u tid: %u\n",
event->itrace_start.pid, event->itrace_start.tid);
}
size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
{
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
const char *in_out = out ? "OUT" : "IN ";
if (event->header.type == PERF_RECORD_SWITCH)
return fprintf(fp, " %s\n", in_out);
return fprintf(fp, " %s %s pid/tid: %5u/%-5u\n",
in_out, out ? "next" : "prev",
event->context_switch.next_prev_pid,
event->context_switch.next_prev_tid);
}
static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
{
return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
}
size_t perf_event__fprintf(union perf_event *event, FILE *fp)
{
size_t ret = fprintf(fp, "PERF_RECORD_%s",
perf_event__name(event->header.type));
switch (event->header.type) {
case PERF_RECORD_COMM:
ret += perf_event__fprintf_comm(event, fp);
break;
case PERF_RECORD_FORK:
case PERF_RECORD_EXIT:
ret += perf_event__fprintf_task(event, fp);
break;
case PERF_RECORD_MMAP:
ret += perf_event__fprintf_mmap(event, fp);
break;
case PERF_RECORD_NAMESPACES:
ret += perf_event__fprintf_namespaces(event, fp);
break;
case PERF_RECORD_MMAP2:
ret += perf_event__fprintf_mmap2(event, fp);
break;
case PERF_RECORD_AUX:
ret += perf_event__fprintf_aux(event, fp);
break;
case PERF_RECORD_ITRACE_START:
ret += perf_event__fprintf_itrace_start(event, fp);
break;
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
ret += perf_event__fprintf_switch(event, fp);
break;
case PERF_RECORD_LOST:
ret += perf_event__fprintf_lost(event, fp);
break;
default:
ret += fprintf(fp, "\n");
}
return ret;
}
int perf_event__process(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
return machine__process_event(machine, event, sample);
}
void thread__find_addr_map(struct thread *thread, u8 cpumode,
enum map_type type, u64 addr,
struct addr_location *al)
{
struct map_groups *mg = thread->mg;
struct machine *machine = mg->machine;
bool load_map = false;
al->machine = machine;
al->thread = thread;
al->addr = addr;
al->cpumode = cpumode;
al->filtered = 0;
if (machine == NULL) {
al->map = NULL;
return;
}
if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
al->level = 'k';
mg = &machine->kmaps;
load_map = true;
} else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
al->level = '.';
} else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
al->level = 'g';
mg = &machine->kmaps;
load_map = true;
} else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
al->level = 'u';
} else {
al->level = 'H';
al->map = NULL;
if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
!perf_guest)
al->filtered |= (1 << HIST_FILTER__GUEST);
if ((cpumode == PERF_RECORD_MISC_USER ||
cpumode == PERF_RECORD_MISC_KERNEL) &&
!perf_host)
al->filtered |= (1 << HIST_FILTER__HOST);
return;
}
try_again:
al->map = map_groups__find(mg, type, al->addr);
if (al->map == NULL) {
/*
* If this is outside of all known maps, and is a negative
* address, try to look it up in the kernel dso, as it might be
* a vsyscall or vdso (which executes in user-mode).
*
* XXX This is nasty, we should have a symbol list in the
* "[vdso]" dso, but for now lets use the old trick of looking
* in the whole kernel symbol list.
*/
if (cpumode == PERF_RECORD_MISC_USER && machine &&
mg != &machine->kmaps &&
machine__kernel_ip(machine, al->addr)) {
mg = &machine->kmaps;
load_map = true;
goto try_again;
}
} else {
/*
* Kernel maps might be changed when loading symbols so loading
* must be done prior to using kernel maps.
*/
if (load_map)
map__load(al->map);
al->addr = al->map->map_ip(al->map, al->addr);
}
}
void thread__find_addr_location(struct thread *thread,
u8 cpumode, enum map_type type, u64 addr,
struct addr_location *al)
{
thread__find_addr_map(thread, cpumode, type, addr, al);
if (al->map != NULL)
al->sym = map__find_symbol(al->map, al->addr);
else
al->sym = NULL;
}
/*
* Callers need to drop the reference to al->thread, obtained in
* machine__findnew_thread()
*/
int machine__resolve(struct machine *machine, struct addr_location *al,
struct perf_sample *sample)
{
struct thread *thread = machine__findnew_thread(machine, sample->pid,
sample->tid);
if (thread == NULL)
return -1;
dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, al);
dump_printf(" ...... dso: %s\n",
al->map ? al->map->dso->long_name :
al->level == 'H' ? "[hypervisor]" : "<not found>");
if (thread__is_filtered(thread))
al->filtered |= (1 << HIST_FILTER__THREAD);
al->sym = NULL;
al->cpu = sample->cpu;
al->socket = -1;
al->srcline = NULL;
if (al->cpu >= 0) {
struct perf_env *env = machine->env;
if (env && env->cpu)
al->socket = env->cpu[al->cpu].socket_id;
}
if (al->map) {
struct dso *dso = al->map->dso;
if (symbol_conf.dso_list &&
(!dso || !(strlist__has_entry(symbol_conf.dso_list,
dso->short_name) ||
(dso->short_name != dso->long_name &&
strlist__has_entry(symbol_conf.dso_list,
dso->long_name))))) {
al->filtered |= (1 << HIST_FILTER__DSO);
}
al->sym = map__find_symbol(al->map, al->addr);
}
if (symbol_conf.sym_list &&
(!al->sym || !strlist__has_entry(symbol_conf.sym_list,
al->sym->name))) {
al->filtered |= (1 << HIST_FILTER__SYMBOL);
}
return 0;
}
/*
* The preprocess_sample method will return with reference counts for the
* in it, when done using (and perhaps getting ref counts if needing to
* keep a pointer to one of those entries) it must be paired with
* addr_location__put(), so that the refcounts can be decremented.
*/
void addr_location__put(struct addr_location *al)
{
thread__zput(al->thread);
}
bool is_bts_event(struct perf_event_attr *attr)
{
return attr->type == PERF_TYPE_HARDWARE &&
(attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
attr->sample_period == 1;
}
bool sample_addr_correlates_sym(struct perf_event_attr *attr)
{
if (attr->type == PERF_TYPE_SOFTWARE &&
(attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
return true;
if (is_bts_event(attr))
return true;
return false;
}
void thread__resolve(struct thread *thread, struct addr_location *al,
struct perf_sample *sample)
{
thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->addr, al);
if (!al->map)
thread__find_addr_map(thread, sample->cpumode, MAP__VARIABLE,
sample->addr, al);
al->cpu = sample->cpu;
al->sym = NULL;
if (al->map)
al->sym = map__find_symbol(al->map, al->addr);
}
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