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OpenCloudOS-Kernel/tools/perf/util/synthetic-events.c

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// SPDX-License-Identifier: GPL-2.0-only
#include "util/debug.h"
#include "util/dso.h"
#include "util/event.h"
#include "util/evlist.h"
#include "util/machine.h"
#include "util/map.h"
#include "util/map_symbol.h"
#include "util/branch.h"
#include "util/memswap.h"
#include "util/namespaces.h"
#include "util/session.h"
#include "util/stat.h"
#include "util/symbol.h"
#include "util/synthetic-events.h"
#include "util/target.h"
#include "util/time-utils.h"
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <linux/perf_event.h>
#include <asm/bug.h>
#include <perf/evsel.h>
#include <internal/cpumap.h>
#include <perf/cpumap.h>
#include <internal/lib.h> // page_size
#include <internal/threadmap.h>
#include <perf/threadmap.h>
#include <symbol/kallsyms.h>
#include <dirent.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
#include <api/fs/fs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
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 = skip_spaces(name + 5); /* strlen("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.misc = PERF_RECORD_MISC_FORK_EXEC;
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)
{
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, "%"PRI_lx64"-%"PRI_lx64" %s %"PRI_lx64" %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 maps *maps = machine__kernel_maps(machine);
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_kmodule(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)
{
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;
/*
* send mmap only for thread group leader
* see thread__init_map_groups
*/
if (pid == tgid &&
perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
process, machine, mmap_data))
return -1;
return 0;
}
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);
if (rc)
break;
}
}
closedir(tasks);
return rc;
}
int perf_event__synthesize_thread_map(struct perf_tool *tool,
struct perf_thread_map *threads,
perf_event__handler_t process,
struct machine *machine,
bool mmap_data)
{
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,
perf_thread_map__pid(threads, thread), 0,
process, tool, machine,
mmap_data)) {
err = -1;
break;
}
/*
* comm.pid is set to thread group id by
* perf_event__synthesize_comm
*/
if ((int) comm_event->comm.pid != perf_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 == perf_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)) {
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,
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);
}
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;
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->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 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,
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].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++)
zfree(&dirent[i]);
free(dirent);
return err;
}
int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
perf_event__handler_t process __maybe_unused,
struct machine *machine __maybe_unused)
{
return 0;
}
static 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 (map == NULL)
return -1;
kmap = map__kmap(map);
if (!kmap->ref_reloc_sym)
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;
}
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_kernel_mmap(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
int err;
err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
if (err < 0)
return err;
return perf_event__synthesize_extra_kmaps(tool, process, machine);
}
int perf_event__synthesize_thread_map2(struct perf_tool *tool,
struct perf_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 perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
char *comm = perf_thread_map__comm(threads, i);
if (!comm)
comm = (char *) "";
entry->pid = perf_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 perf_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 perf_record_record_cpu_map *mask,
struct perf_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 perf_cpu_map *map)
{
return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
}
static size_t mask_size(struct perf_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 perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long);
}
void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max)
{
size_t size_cpus, size_mask;
bool is_dummy = perf_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 perf_record_cpu_map_data' is:
*
* array = size of 'struct cpu_map_entries' +
* number of cpus * sizeof(u64)
*
* mask = size of 'struct perf_record_record_cpu_map' +
* maximum cpu bit converted to size of longs
*
* and finaly + the size of 'struct perf_record_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 perf_record_cpu_map_data);
*size = PERF_ALIGN(*size, sizeof(u64));
return zalloc(*size);
}
void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_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 perf_record_record_cpu_map *)data->data, map, max);
default:
break;
};
}
static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map)
{
size_t size = sizeof(struct perf_record_cpu_map);
struct perf_record_cpu_map *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 perf_cpu_map *map,
perf_event__handler_t process,
struct machine *machine)
{
struct perf_record_cpu_map *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 perf_record_stat_config *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 perf_record_stat 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 perf_record_stat_round 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);
}
size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
{
size_t sz, result = sizeof(struct perf_record_sample);
if (type & PERF_SAMPLE_IDENTIFIER)
result += sizeof(u64);
if (type & PERF_SAMPLE_IP)
result += sizeof(u64);
if (type & PERF_SAMPLE_TID)
result += sizeof(u64);
if (type & PERF_SAMPLE_TIME)
result += sizeof(u64);
if (type & PERF_SAMPLE_ADDR)
result += sizeof(u64);
if (type & PERF_SAMPLE_ID)
result += sizeof(u64);
if (type & PERF_SAMPLE_STREAM_ID)
result += sizeof(u64);
if (type & PERF_SAMPLE_CPU)
result += sizeof(u64);
if (type & PERF_SAMPLE_PERIOD)
result += sizeof(u64);
if (type & PERF_SAMPLE_READ) {
result += sizeof(u64);
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
result += sizeof(u64);
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
result += sizeof(u64);
/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
if (read_format & PERF_FORMAT_GROUP) {
sz = sample->read.group.nr *
sizeof(struct sample_read_value);
result += sz;
} else {
result += sizeof(u64);
}
}
if (type & PERF_SAMPLE_CALLCHAIN) {
sz = (sample->callchain->nr + 1) * sizeof(u64);
result += sz;
}
if (type & PERF_SAMPLE_RAW) {
result += sizeof(u32);
result += sample->raw_size;
}
if (type & PERF_SAMPLE_BRANCH_STACK) {
sz = sample->branch_stack->nr * sizeof(struct branch_entry);
sz += sizeof(u64);
result += sz;
}
if (type & PERF_SAMPLE_REGS_USER) {
if (sample->user_regs.abi) {
result += sizeof(u64);
sz = hweight64(sample->user_regs.mask) * sizeof(u64);
result += sz;
} else {
result += sizeof(u64);
}
}
if (type & PERF_SAMPLE_STACK_USER) {
sz = sample->user_stack.size;
result += sizeof(u64);
if (sz) {
result += sz;
result += sizeof(u64);
}
}
if (type & PERF_SAMPLE_WEIGHT)
result += sizeof(u64);
if (type & PERF_SAMPLE_DATA_SRC)
result += sizeof(u64);
if (type & PERF_SAMPLE_TRANSACTION)
result += sizeof(u64);
if (type & PERF_SAMPLE_REGS_INTR) {
if (sample->intr_regs.abi) {
result += sizeof(u64);
sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
result += sz;
} else {
result += sizeof(u64);
}
}
if (type & PERF_SAMPLE_PHYS_ADDR)
result += sizeof(u64);
if (type & PERF_SAMPLE_AUX) {
result += sizeof(u64);
result += sample->aux_sample.size;
}
return result;
}
int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
const struct perf_sample *sample)
{
__u64 *array;
size_t sz;
/*
* used for cross-endian analysis. See git commit 65014ab3
* for why this goofiness is needed.
*/
union u64_swap u;
array = event->sample.array;
if (type & PERF_SAMPLE_IDENTIFIER) {
*array = sample->id;
array++;
}
if (type & PERF_SAMPLE_IP) {
*array = sample->ip;
array++;
}
if (type & PERF_SAMPLE_TID) {
u.val32[0] = sample->pid;
u.val32[1] = sample->tid;
*array = u.val64;
array++;
}
if (type & PERF_SAMPLE_TIME) {
*array = sample->time;
array++;
}
if (type & PERF_SAMPLE_ADDR) {
*array = sample->addr;
array++;
}
if (type & PERF_SAMPLE_ID) {
*array = sample->id;
array++;
}
if (type & PERF_SAMPLE_STREAM_ID) {
*array = sample->stream_id;
array++;
}
if (type & PERF_SAMPLE_CPU) {
u.val32[0] = sample->cpu;
u.val32[1] = 0;
*array = u.val64;
array++;
}
if (type & PERF_SAMPLE_PERIOD) {
*array = sample->period;
array++;
}
if (type & PERF_SAMPLE_READ) {
if (read_format & PERF_FORMAT_GROUP)
*array = sample->read.group.nr;
else
*array = sample->read.one.value;
array++;
if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
*array = sample->read.time_enabled;
array++;
}
if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
*array = sample->read.time_running;
array++;
}
/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
if (read_format & PERF_FORMAT_GROUP) {
sz = sample->read.group.nr *
sizeof(struct sample_read_value);
memcpy(array, sample->read.group.values, sz);
array = (void *)array + sz;
} else {
*array = sample->read.one.id;
array++;
}
}
if (type & PERF_SAMPLE_CALLCHAIN) {
sz = (sample->callchain->nr + 1) * sizeof(u64);
memcpy(array, sample->callchain, sz);
array = (void *)array + sz;
}
if (type & PERF_SAMPLE_RAW) {
u.val32[0] = sample->raw_size;
*array = u.val64;
array = (void *)array + sizeof(u32);
memcpy(array, sample->raw_data, sample->raw_size);
array = (void *)array + sample->raw_size;
}
if (type & PERF_SAMPLE_BRANCH_STACK) {
sz = sample->branch_stack->nr * sizeof(struct branch_entry);
sz += sizeof(u64);
memcpy(array, sample->branch_stack, sz);
array = (void *)array + sz;
}
if (type & PERF_SAMPLE_REGS_USER) {
if (sample->user_regs.abi) {
*array++ = sample->user_regs.abi;
sz = hweight64(sample->user_regs.mask) * sizeof(u64);
memcpy(array, sample->user_regs.regs, sz);
array = (void *)array + sz;
} else {
*array++ = 0;
}
}
if (type & PERF_SAMPLE_STACK_USER) {
sz = sample->user_stack.size;
*array++ = sz;
if (sz) {
memcpy(array, sample->user_stack.data, sz);
array = (void *)array + sz;
*array++ = sz;
}
}
if (type & PERF_SAMPLE_WEIGHT) {
*array = sample->weight;
array++;
}
if (type & PERF_SAMPLE_DATA_SRC) {
*array = sample->data_src;
array++;
}
if (type & PERF_SAMPLE_TRANSACTION) {
*array = sample->transaction;
array++;
}
if (type & PERF_SAMPLE_REGS_INTR) {
if (sample->intr_regs.abi) {
*array++ = sample->intr_regs.abi;
sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
memcpy(array, sample->intr_regs.regs, sz);
array = (void *)array + sz;
} else {
*array++ = 0;
}
}
if (type & PERF_SAMPLE_PHYS_ADDR) {
*array = sample->phys_addr;
array++;
}
if (type & PERF_SAMPLE_AUX) {
sz = sample->aux_sample.size;
*array++ = sz;
memcpy(array, sample->aux_sample.data, sz);
array = (void *)array + sz;
}
return 0;
}
int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
struct evlist *evlist, struct machine *machine)
{
union perf_event *ev;
struct evsel *evsel;
size_t nr = 0, i = 0, sz, max_nr, n;
int err;
pr_debug2("Synthesizing id index\n");
max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) /
sizeof(struct id_index_entry);
evlist__for_each_entry(evlist, evsel)
nr += evsel->core.ids;
n = nr > max_nr ? max_nr : nr;
sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry);
ev = zalloc(sz);
if (!ev)
return -ENOMEM;
ev->id_index.header.type = PERF_RECORD_ID_INDEX;
ev->id_index.header.size = sz;
ev->id_index.nr = n;
evlist__for_each_entry(evlist, evsel) {
u32 j;
for (j = 0; j < evsel->core.ids; j++) {
struct id_index_entry *e;
struct perf_sample_id *sid;
if (i >= n) {
err = process(tool, ev, NULL, machine);
if (err)
goto out_err;
nr -= n;
i = 0;
}
e = &ev->id_index.entries[i++];
e->id = evsel->core.id[j];
sid = perf_evlist__id2sid(evlist, e->id);
if (!sid) {
free(ev);
return -ENOENT;
}
e->idx = sid->idx;
e->cpu = sid->cpu;
e->tid = sid->tid;
}
}
sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry);
ev->id_index.header.size = sz;
ev->id_index.nr = nr;
err = process(tool, ev, NULL, machine);
out_err:
free(ev);
return err;
}
int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
struct target *target, struct perf_thread_map *threads,
perf_event__handler_t process, bool data_mmap,
unsigned int nr_threads_synthesize)
{
if (target__has_task(target))
return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
else if (target__has_cpu(target))
return perf_event__synthesize_threads(tool, process,
machine, data_mmap,
nr_threads_synthesize);
/* command specified */
return 0;
}
int machine__synthesize_threads(struct machine *machine, struct target *target,
struct perf_thread_map *threads, bool data_mmap,
unsigned int nr_threads_synthesize)
{
return __machine__synthesize_threads(machine, NULL, target, threads,
perf_event__process, data_mmap,
nr_threads_synthesize);
}
static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
{
struct perf_record_event_update *ev;
size += sizeof(*ev);
size = PERF_ALIGN(size, sizeof(u64));
ev = zalloc(size);
if (ev) {
ev->header.type = PERF_RECORD_EVENT_UPDATE;
ev->header.size = (u16)size;
ev->type = type;
ev->id = id;
}
return ev;
}
int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
perf_event__handler_t process)
{
size_t size = strlen(evsel->unit);
struct perf_record_event_update *ev;
int err;
ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
if (ev == NULL)
return -ENOMEM;
strlcpy(ev->data, evsel->unit, size + 1);
err = process(tool, (union perf_event *)ev, NULL, NULL);
free(ev);
return err;
}
int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
perf_event__handler_t process)
{
struct perf_record_event_update *ev;
struct perf_record_event_update_scale *ev_data;
int err;
ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
if (ev == NULL)
return -ENOMEM;
ev_data = (struct perf_record_event_update_scale *)ev->data;
ev_data->scale = evsel->scale;
err = process(tool, (union perf_event *)ev, NULL, NULL);
free(ev);
return err;
}
int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
perf_event__handler_t process)
{
struct perf_record_event_update *ev;
size_t len = strlen(evsel->name);
int err;
ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
if (ev == NULL)
return -ENOMEM;
strlcpy(ev->data, evsel->name, len + 1);
err = process(tool, (union perf_event *)ev, NULL, NULL);
free(ev);
return err;
}
int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
perf_event__handler_t process)
{
size_t size = sizeof(struct perf_record_event_update);
struct perf_record_event_update *ev;
int max, err;
u16 type;
if (!evsel->core.own_cpus)
return 0;
ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max);
if (!ev)
return -ENOMEM;
ev->header.type = PERF_RECORD_EVENT_UPDATE;
ev->header.size = (u16)size;
ev->type = PERF_EVENT_UPDATE__CPUS;
ev->id = evsel->core.id[0];
cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data,
evsel->core.own_cpus, type, max);
err = process(tool, (union perf_event *)ev, NULL, NULL);
free(ev);
return err;
}
int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
perf_event__handler_t process)
{
struct evsel *evsel;
int err = 0;
evlist__for_each_entry(evlist, evsel) {
err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
evsel->core.id, process);
if (err) {
pr_debug("failed to create perf header attribute\n");
return err;
}
}
return err;
}
static bool has_unit(struct evsel *evsel)
{
return evsel->unit && *evsel->unit;
}
static bool has_scale(struct evsel *evsel)
{
return evsel->scale != 1;
}
int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
perf_event__handler_t process, bool is_pipe)
{
struct evsel *evsel;
int err;
/*
* Synthesize other events stuff not carried within
* attr event - unit, scale, name
*/
evlist__for_each_entry(evsel_list, evsel) {
if (!evsel->supported)
continue;
/*
* Synthesize unit and scale only if it's defined.
*/
if (has_unit(evsel)) {
err = perf_event__synthesize_event_update_unit(tool, evsel, process);
if (err < 0) {
pr_err("Couldn't synthesize evsel unit.\n");
return err;
}
}
if (has_scale(evsel)) {
err = perf_event__synthesize_event_update_scale(tool, evsel, process);
if (err < 0) {
pr_err("Couldn't synthesize evsel evsel.\n");
return err;
}
}
if (evsel->core.own_cpus) {
err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
if (err < 0) {
pr_err("Couldn't synthesize evsel cpus.\n");
return err;
}
}
/*
* Name is needed only for pipe output,
* perf.data carries event names.
*/
if (is_pipe) {
err = perf_event__synthesize_event_update_name(tool, evsel, process);
if (err < 0) {
pr_err("Couldn't synthesize evsel name.\n");
return err;
}
}
}
return 0;
}
int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
u32 ids, u64 *id, perf_event__handler_t process)
{
union perf_event *ev;
size_t size;
int err;
size = sizeof(struct perf_event_attr);
size = PERF_ALIGN(size, sizeof(u64));
size += sizeof(struct perf_event_header);
size += ids * sizeof(u64);
ev = zalloc(size);
if (ev == NULL)
return -ENOMEM;
ev->attr.attr = *attr;
memcpy(ev->attr.id, id, ids * sizeof(u64));
ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
ev->attr.header.size = (u16)size;
if (ev->attr.header.size == size)
err = process(tool, ev, NULL, NULL);
else
err = -E2BIG;
free(ev);
return err;
}
int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
perf_event__handler_t process)
{
union perf_event ev;
struct tracing_data *tdata;
ssize_t size = 0, aligned_size = 0, padding;
struct feat_fd ff;
/*
* We are going to store the size of the data followed
* by the data contents. Since the fd descriptor is a pipe,
* we cannot seek back to store the size of the data once
* we know it. Instead we:
*
* - write the tracing data to the temp file
* - get/write the data size to pipe
* - write the tracing data from the temp file
* to the pipe
*/
tdata = tracing_data_get(&evlist->core.entries, fd, true);
if (!tdata)
return -1;
memset(&ev, 0, sizeof(ev));
ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
size = tdata->size;
aligned_size = PERF_ALIGN(size, sizeof(u64));
padding = aligned_size - size;
ev.tracing_data.header.size = sizeof(ev.tracing_data);
ev.tracing_data.size = aligned_size;
process(tool, &ev, NULL, NULL);
/*
* The put function will copy all the tracing data
* stored in temp file to the pipe.
*/
tracing_data_put(tdata);
ff = (struct feat_fd){ .fd = fd };
if (write_padded(&ff, NULL, 0, padding))
return -1;
return aligned_size;
}
int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
perf_event__handler_t process, struct machine *machine)
{
union perf_event ev;
size_t len;
if (!pos->hit)
return 0;
memset(&ev, 0, sizeof(ev));
len = pos->long_name_len + 1;
len = PERF_ALIGN(len, NAME_ALIGN);
memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
ev.build_id.header.misc = misc;
ev.build_id.pid = machine->pid;
ev.build_id.header.size = sizeof(ev.build_id) + len;
memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
return process(tool, &ev, NULL, machine);
}
int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
struct evlist *evlist, perf_event__handler_t process, bool attrs)
{
int err;
if (attrs) {
err = perf_event__synthesize_attrs(tool, evlist, process);
if (err < 0) {
pr_err("Couldn't synthesize attrs.\n");
return err;
}
}
err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
if (err < 0) {
pr_err("Couldn't synthesize thread map.\n");
return err;
}
err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL);
if (err < 0) {
pr_err("Couldn't synthesize thread map.\n");
return err;
}
err = perf_event__synthesize_stat_config(tool, config, process, NULL);
if (err < 0) {
pr_err("Couldn't synthesize config.\n");
return err;
}
return 0;
}
int __weak perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
struct perf_tool *tool __maybe_unused,
perf_event__handler_t process __maybe_unused,
struct machine *machine __maybe_unused)
{
return 0;
}
extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
struct evlist *evlist, perf_event__handler_t process)
{
struct perf_header *header = &session->header;
struct perf_record_header_feature *fe;
struct feat_fd ff;
size_t sz, sz_hdr;
int feat, ret;
sz_hdr = sizeof(fe->header);
sz = sizeof(union perf_event);
/* get a nice alignment */
sz = PERF_ALIGN(sz, page_size);
memset(&ff, 0, sizeof(ff));
ff.buf = malloc(sz);
if (!ff.buf)
return -ENOMEM;
ff.size = sz - sz_hdr;
ff.ph = &session->header;
for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
if (!feat_ops[feat].synthesize) {
pr_debug("No record header feature for header :%d\n", feat);
continue;
}
ff.offset = sizeof(*fe);
ret = feat_ops[feat].write(&ff, evlist);
if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
pr_debug("Error writing feature\n");
continue;
}
/* ff.buf may have changed due to realloc in do_write() */
fe = ff.buf;
memset(fe, 0, sizeof(*fe));
fe->feat_id = feat;
fe->header.type = PERF_RECORD_HEADER_FEATURE;
fe->header.size = ff.offset;
ret = process(tool, ff.buf, NULL, NULL);
if (ret) {
free(ff.buf);
return ret;
}
}
/* Send HEADER_LAST_FEATURE mark. */
fe = ff.buf;
fe->feat_id = HEADER_LAST_FEATURE;
fe->header.type = PERF_RECORD_HEADER_FEATURE;
fe->header.size = sizeof(*fe);
ret = process(tool, ff.buf, NULL, NULL);
free(ff.buf);
return ret;
}
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