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linux-zen-server/tools/perf/util/synthetic-events.c

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// SPDX-License-Identifier: GPL-2.0-only
#include "util/cgroup.h"
#include "util/data.h"
#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 <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 <api/io.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, pid_t tid, char *comm, size_t len,
pid_t *tgid, pid_t *ppid, bool *kernel)
{
char bf[4096];
int fd;
size_t size = 0;
ssize_t n;
char *name, *tgids, *ppids, *vmpeak, *threads;
*tgid = -1;
*ppid = -1;
if (pid)
snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid);
else
snprintf(bf, sizeof(bf), "/proc/%d/status", tid);
fd = open(bf, O_RDONLY);
if (fd < 0) {
pr_debug("couldn't open %s\n", bf);
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",
tid);
return -1;
}
bf[n] = '\0';
name = strstr(bf, "Name:");
tgids = strstr(name ?: bf, "Tgid:");
ppids = strstr(tgids ?: bf, "PPid:");
vmpeak = strstr(ppids ?: bf, "VmPeak:");
if (vmpeak)
threads = NULL;
else
threads = strstr(ppids ?: bf, "Threads:");
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", tid);
}
if (tgids) {
tgids += 5; /* strlen("Tgid:") */
*tgid = atoi(tgids);
} else {
pr_debug("Tgid: string not found for pid %d\n", tid);
}
if (ppids) {
ppids += 5; /* strlen("PPid:") */
*ppid = atoi(ppids);
} else {
pr_debug("PPid: string not found for pid %d\n", tid);
}
if (!vmpeak && threads)
*kernel = true;
else
*kernel = false;
return 0;
}
static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid,
struct machine *machine,
pid_t *tgid, pid_t *ppid, bool *kernel)
{
size_t size;
*ppid = -1;
memset(&event->comm, 0, sizeof(event->comm));
if (machine__is_host(machine)) {
if (perf_event__get_comm_ids(pid, tid, event->comm.comm,
sizeof(event->comm.comm),
tgid, ppid, kernel) != 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 = tid;
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;
bool kernel_thread;
if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid,
&kernel_thread) != 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;
}
static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
u32 *prot, u32 *flags, __u64 *offset,
u32 *maj, u32 *min,
__u64 *inode,
ssize_t pathname_size, char *pathname)
{
__u64 temp;
int ch;
char *start_pathname = pathname;
if (io__get_hex(io, start) != '-')
return false;
if (io__get_hex(io, end) != ' ')
return false;
/* map protection and flags bits */
*prot = 0;
ch = io__get_char(io);
if (ch == 'r')
*prot |= PROT_READ;
else if (ch != '-')
return false;
ch = io__get_char(io);
if (ch == 'w')
*prot |= PROT_WRITE;
else if (ch != '-')
return false;
ch = io__get_char(io);
if (ch == 'x')
*prot |= PROT_EXEC;
else if (ch != '-')
return false;
ch = io__get_char(io);
if (ch == 's')
*flags = MAP_SHARED;
else if (ch == 'p')
*flags = MAP_PRIVATE;
else
return false;
if (io__get_char(io) != ' ')
return false;
if (io__get_hex(io, offset) != ' ')
return false;
if (io__get_hex(io, &temp) != ':')
return false;
*maj = temp;
if (io__get_hex(io, &temp) != ' ')
return false;
*min = temp;
ch = io__get_dec(io, inode);
if (ch != ' ') {
*pathname = '\0';
return ch == '\n';
}
do {
ch = io__get_char(io);
} while (ch == ' ');
while (true) {
if (ch < 0)
return false;
if (ch == '\0' || ch == '\n' ||
(pathname + 1 - start_pathname) >= pathname_size) {
*pathname = '\0';
return true;
}
*pathname++ = ch;
ch = io__get_char(io);
}
}
static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
struct machine *machine,
bool is_kernel)
{
struct build_id bid;
struct nsinfo *nsi;
struct nscookie nc;
struct dso *dso = NULL;
struct dso_id id;
int rc;
if (is_kernel) {
rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
goto out;
}
id.maj = event->maj;
id.min = event->min;
id.ino = event->ino;
id.ino_generation = event->ino_generation;
dso = dsos__findnew_id(&machine->dsos, event->filename, &id);
if (dso && dso->has_build_id) {
bid = dso->bid;
rc = 0;
goto out;
}
nsi = nsinfo__new(event->pid);
nsinfo__mountns_enter(nsi, &nc);
rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
nsinfo__mountns_exit(&nc);
nsinfo__put(nsi);
out:
if (rc == 0) {
memcpy(event->build_id, bid.data, sizeof(bid.data));
event->build_id_size = (u8) bid.size;
event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
event->__reserved_1 = 0;
event->__reserved_2 = 0;
if (dso && !dso->has_build_id)
dso__set_build_id(dso, &bid);
} else {
if (event->filename[0] == '/') {
pr_debug2("Failed to read build ID for %s\n",
event->filename);
}
}
dso__put(dso);
}
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 long long t;
char bf[BUFSIZ];
struct io io;
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(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
machine->root_dir, pid, pid);
io.fd = open(bf, O_RDONLY, 0);
if (io.fd < 0) {
/*
* We raced with a task exiting - just return:
*/
pr_debug("couldn't open %s\n", bf);
return -1;
}
io__init(&io, io.fd, bf, sizeof(bf));
event->header.type = PERF_RECORD_MMAP2;
t = rdclock();
while (!io.eof) {
static const char anonstr[] = "//anon";
size_t size, aligned_size;
/* ensure null termination since stack will be reused. */
event->mmap2.filename[0] = '\0';
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
if (!read_proc_maps_line(&io,
&event->mmap2.start,
&event->mmap2.len,
&event->mmap2.prot,
&event->mmap2.flags,
&event->mmap2.pgoff,
&event->mmap2.maj,
&event->mmap2.min,
&event->mmap2.ino,
sizeof(event->mmap2.filename),
event->mmap2.filename))
continue;
if ((rdclock() - t) > timeout) {
pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
"You may want to increase "
"the time limit by --proc-map-timeout\n",
machine->root_dir, pid, pid);
truncation = true;
goto out;
}
event->mmap2.ino_generation = 0;
/*
* 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;
if ((event->mmap2.prot & PROT_EXEC) == 0) {
if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
continue;
event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
}
out:
if (truncation)
event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
if (!strcmp(event->mmap2.filename, ""))
strcpy(event->mmap2.filename, anonstr);
if (hugetlbfs_mnt_len &&
!strncmp(event->mmap2.filename, hugetlbfs_mnt,
hugetlbfs_mnt_len)) {
strcpy(event->mmap2.filename, anonstr);
event->mmap2.flags |= MAP_HUGETLB;
}
size = strlen(event->mmap2.filename) + 1;
aligned_size = PERF_ALIGN(size, sizeof(u64));
event->mmap2.len -= event->mmap.start;
event->mmap2.header.size = (sizeof(event->mmap2) -
(sizeof(event->mmap2.filename) - aligned_size));
memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
(aligned_size - size));
event->mmap2.header.size += machine->id_hdr_size;
event->mmap2.pid = tgid;
event->mmap2.tid = pid;
if (symbol_conf.buildid_mmap2)
perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
rc = -1;
break;
}
if (truncation)
break;
}
close(io.fd);
return rc;
}
#ifdef HAVE_FILE_HANDLE
static int perf_event__synthesize_cgroup(struct perf_tool *tool,
union perf_event *event,
char *path, size_t mount_len,
perf_event__handler_t process,
struct machine *machine)
{
size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
size_t path_len = strlen(path) - mount_len + 1;
struct {
struct file_handle fh;
uint64_t cgroup_id;
} handle;
int mount_id;
while (path_len % sizeof(u64))
path[mount_len + path_len++] = '\0';
memset(&event->cgroup, 0, event_size);
event->cgroup.header.type = PERF_RECORD_CGROUP;
event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
handle.fh.handle_bytes = sizeof(handle.cgroup_id);
if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
pr_debug("stat failed: %s\n", path);
return -1;
}
event->cgroup.id = handle.cgroup_id;
strncpy(event->cgroup.path, path + mount_len, path_len);
memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
pr_debug("process synth event failed\n");
return -1;
}
return 0;
}
static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
union perf_event *event,
char *path, size_t mount_len,
perf_event__handler_t process,
struct machine *machine)
{
size_t pos = strlen(path);
DIR *d;
struct dirent *dent;
int ret = 0;
if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
process, machine) < 0)
return -1;
d = opendir(path);
if (d == NULL) {
pr_debug("failed to open directory: %s\n", path);
return -1;
}
while ((dent = readdir(d)) != NULL) {
if (dent->d_type != DT_DIR)
continue;
if (!strcmp(dent->d_name, ".") ||
!strcmp(dent->d_name, ".."))
continue;
/* any sane path should be less than PATH_MAX */
if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
continue;
if (path[pos - 1] != '/')
strcat(path, "/");
strcat(path, dent->d_name);
ret = perf_event__walk_cgroup_tree(tool, event, path,
mount_len, process, machine);
if (ret < 0)
break;
path[pos] = '\0';
}
closedir(d);
return ret;
}
int perf_event__synthesize_cgroups(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
union perf_event event;
char cgrp_root[PATH_MAX];
size_t mount_len; /* length of mount point in the path */
if (!tool || !tool->cgroup_events)
return 0;
if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
pr_debug("cannot find cgroup mount point\n");
return -1;
}
mount_len = strlen(cgrp_root);
/* make sure the path starts with a slash (after mount point) */
strcat(cgrp_root, "/");
if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
process, machine) < 0)
return -1;
return 0;
}
#else
int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
perf_event__handler_t process __maybe_unused,
struct machine *machine __maybe_unused)
{
return -1;
}
#endif
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;
size_t size = symbol_conf.buildid_mmap2 ?
sizeof(event->mmap2) : sizeof(event->mmap);
event = zalloc(size + machine->id_hdr_size);
if (event == NULL) {
pr_debug("Not enough memory synthesizing mmap event "
"for kernel modules\n");
return -1;
}
/*
* 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;
maps__for_each_entry(maps, pos) {
if (!__map__is_kmodule(pos))
continue;
if (symbol_conf.buildid_mmap2) {
size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
event->mmap2.header.type = PERF_RECORD_MMAP2;
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.start = pos->start;
event->mmap2.len = pos->end - pos->start;
event->mmap2.pid = machine->pid;
memcpy(event->mmap2.filename, pos->dso->long_name,
pos->dso->long_name_len + 1);
perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
} else {
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 filter_task(const struct dirent *dirent)
{
return isdigit(dirent->d_name[0]);
}
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 needs_mmap, bool mmap_data)
{
char filename[PATH_MAX];
struct dirent **dirent;
pid_t tgid, ppid;
int rc = 0;
int i, n;
/* 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_maps()
*/
if (pid == tgid && needs_mmap &&
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);
n = scandir(filename, &dirent, filter_task, NULL);
if (n < 0)
return n;
for (i = 0; i < n; i++) {
char *end;
pid_t _pid;
bool kernel_thread = false;
_pid = strtol(dirent[i]->d_name, &end, 10);
if (*end)
continue;
/* some threads may exit just after scan, ignore it */
if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
&tgid, &ppid, &kernel_thread) != 0)
continue;
rc = -1;
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 && !kernel_thread && needs_mmap) {
/* process the parent's maps too */
rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
process, machine, mmap_data);
if (rc)
break;
}
}
for (i = 0; i < n; i++)
zfree(&dirent[i]);
free(dirent);
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 needs_mmap, 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,
needs_mmap, 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,
needs_mmap, 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 needs_mmap,
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, needs_mmap, 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 needs_mmap;
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->needs_mmap, 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 needs_mmap, 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, filter_task, NULL);
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,
needs_mmap, 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].needs_mmap = needs_mmap;
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)
{
union perf_event *event;
size_t size = symbol_conf.buildid_mmap2 ?
sizeof(event->mmap2) : sizeof(event->mmap);
struct map *map = machine__kernel_map(machine);
struct kmap *kmap;
int err;
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(size + 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;
}
if (symbol_conf.buildid_mmap2) {
size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
size = PERF_ALIGN(size, sizeof(u64));
event->mmap2.header.type = PERF_RECORD_MMAP2;
event->mmap2.header.size = (sizeof(event->mmap2) -
(sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
event->mmap2.start = map->start;
event->mmap2.len = map->end - event->mmap.start;
event->mmap2.pid = machine->pid;
perf_record_mmap2__read_build_id(&event->mmap2, machine, true);
} else {
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;
}
struct synthesize_cpu_map_data {
const struct perf_cpu_map *map;
int nr;
int min_cpu;
int max_cpu;
int has_any_cpu;
int type;
size_t size;
struct perf_record_cpu_map_data *data;
};
static void synthesize_cpus(struct synthesize_cpu_map_data *data)
{
data->data->type = PERF_CPU_MAP__CPUS;
data->data->cpus_data.nr = data->nr;
for (int i = 0; i < data->nr; i++)
data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
}
static void synthesize_mask(struct synthesize_cpu_map_data *data)
{
int idx;
struct perf_cpu cpu;
/* Due to padding, the 4bytes per entry mask variant is always smaller. */
data->data->type = PERF_CPU_MAP__MASK;
data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
data->data->mask32_data.long_size = 4;
perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
int bit_word = cpu.cpu / 32;
u32 bit_mask = 1U << (cpu.cpu & 31);
data->data->mask32_data.mask[bit_word] |= bit_mask;
}
}
static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
{
data->data->type = PERF_CPU_MAP__RANGE_CPUS;
data->data->range_cpu_data.any_cpu = data->has_any_cpu;
data->data->range_cpu_data.start_cpu = data->min_cpu;
data->data->range_cpu_data.end_cpu = data->max_cpu;
}
static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
size_t header_size)
{
size_t size_cpus, size_mask;
syn_data->nr = perf_cpu_map__nr(syn_data->map);
syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
/* A consecutive range of CPUs can be encoded using a range. */
assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
syn_data->size = header_size + sizeof(u64);
return zalloc(syn_data->size);
}
size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
/* Due to padding, the 4bytes per entry mask variant is always smaller. */
size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
if (syn_data->has_any_cpu || size_cpus < size_mask) {
/* Follow the CPU map encoding. */
syn_data->type = PERF_CPU_MAP__CPUS;
syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
return zalloc(syn_data->size);
}
/* Encode using a bitmask. */
syn_data->type = PERF_CPU_MAP__MASK;
syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
return zalloc(syn_data->size);
}
static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
{
switch (data->type) {
case PERF_CPU_MAP__CPUS:
synthesize_cpus(data);
break;
case PERF_CPU_MAP__MASK:
synthesize_mask(data);
break;
case PERF_CPU_MAP__RANGE_CPUS:
synthesize_range_cpus(data);
break;
default:
break;
}
}
static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
{
struct synthesize_cpu_map_data syn_data = { .map = map };
struct perf_record_cpu_map *event;
event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header));
if (!event)
return NULL;
syn_data.data = &event->data;
event->header.type = PERF_RECORD_CPU_MAP;
event->header.size = syn_data.size;
cpu_map_data__synthesize(&syn_data);
return event;
}
int perf_event__synthesize_cpu_map(struct perf_tool *tool,
const 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,
struct perf_cpu 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.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_value_size(read_format);
result += sz * sample->read.group.nr;
} else {
result += sizeof(u64);
if (read_format & PERF_FORMAT_LOST)
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);
/* nr, hw_idx */
sz += 2 * 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_TYPE)
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_CGROUP)
result += sizeof(u64);
if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
result += sizeof(u64);
if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
result += sizeof(u64);
if (type & PERF_SAMPLE_AUX) {
result += sizeof(u64);
result += sample->aux_sample.size;
}
return result;
}
void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
__u64 *array, u64 type __maybe_unused)
{
*array = data->weight;
}
static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
const struct perf_sample *sample)
{
size_t sz = sample_read_value_size(read_format);
struct sample_read_value *v = sample->read.group.values;
sample_read_group__for_each(v, sample->read.group.nr, read_format) {
/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
memcpy(array, v, sz);
array = (void *)array + sz;
}
return array;
}
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) {
array = copy_read_group_values(array, read_format,
sample);
} else {
*array = sample->read.one.id;
array++;
if (read_format & PERF_FORMAT_LOST) {
*array = sample->read.one.lost;
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);
/* nr, hw_idx */
sz += 2 * 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_TYPE) {
arch_perf_synthesize_sample_weight(sample, array, type);
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_CGROUP) {
*array = sample->cgroup;
array++;
}
if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
*array = sample->data_page_size;
array++;
}
if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
*array = sample->code_page_size;
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_sample(__u64 *array, u64 type, const struct perf_sample *sample)
{
__u64 *start = array;
/*
* used for cross-endian analysis. See git commit 65014ab3
* for why this goofiness is needed.
*/
union u64_swap u;
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_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_IDENTIFIER) {
*array = sample->id;
array++;
}
return (void *)array - (void *)start;
}
int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
struct evlist *evlist, struct machine *machine, size_t from)
{
union perf_event *ev;
struct evsel *evsel;
size_t nr = 0, i = 0, sz, max_nr, n, pos;
size_t e1_sz = sizeof(struct id_index_entry);
size_t e2_sz = sizeof(struct id_index_entry_2);
size_t etot_sz = e1_sz + e2_sz;
bool e2_needed = false;
int err;
max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
pos = 0;
evlist__for_each_entry(evlist, evsel) {
if (pos++ < from)
continue;
nr += evsel->core.ids;
}
if (!nr)
return 0;
pr_debug2("Synthesizing id index\n");
n = nr > max_nr ? max_nr : nr;
sz = sizeof(struct perf_record_id_index) + n * etot_sz;
ev = zalloc(sz);
if (!ev)
return -ENOMEM;
sz = sizeof(struct perf_record_id_index) + n * e1_sz;
ev->id_index.header.type = PERF_RECORD_ID_INDEX;
ev->id_index.nr = n;
pos = 0;
evlist__for_each_entry(evlist, evsel) {
u32 j;
if (pos++ < from)
continue;
for (j = 0; j < evsel->core.ids; j++, i++) {
struct id_index_entry *e;
struct id_index_entry_2 *e2;
struct perf_sample_id *sid;
if (i >= n) {
ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
err = process(tool, ev, NULL, machine);
if (err)
goto out_err;
nr -= n;
i = 0;
e2_needed = false;
}
e = &ev->id_index.entries[i];
e->id = evsel->core.id[j];
sid = evlist__id2sid(evlist, e->id);
if (!sid) {
free(ev);
return -ENOENT;
}
e->idx = sid->idx;
e->cpu = sid->cpu.cpu;
e->tid = sid->tid;
if (sid->machine_pid)
e2_needed = true;
e2 = (void *)ev + sz;
e2[i].machine_pid = sid->machine_pid;
e2[i].vcpu = sid->vcpu.cpu;
}
}
sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
ev->id_index.nr = nr;
err = process(tool, ev, NULL, machine);
out_err:
free(ev);
return err;
}
int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
struct evlist *evlist, struct machine *machine)
{
return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
}
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 needs_mmap,
bool data_mmap, unsigned int nr_threads_synthesize)
{
/*
* When perf runs in non-root PID namespace, and the namespace's proc FS
* is not mounted, nsinfo__is_in_root_namespace() returns false.
* In this case, the proc FS is coming for the parent namespace, thus
* perf tool will wrongly gather process info from its parent PID
* namespace.
*
* To avoid the confusion that the perf tool runs in a child PID
* namespace but it synthesizes thread info from its parent PID
* namespace, returns failure with warning.
*/
if (!nsinfo__is_in_root_namespace()) {
pr_err("Perf runs in non-root PID namespace but it tries to ");
pr_err("gather process info from its parent PID namespace.\n");
pr_err("Please mount the proc file system properly, e.g. ");
pr_err("add the option '--mount-proc' for unshare command.\n");
return -EPERM;
}
if (target__has_task(target))
return perf_event__synthesize_thread_map(tool, threads, process, machine,
needs_mmap, data_mmap);
else if (target__has_cpu(target))
return perf_event__synthesize_threads(tool, process, machine,
needs_mmap, 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 needs_mmap,
bool data_mmap, unsigned int nr_threads_synthesize)
{
return __machine__synthesize_threads(machine, NULL, target, threads,
perf_event__process, needs_mmap,
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->unit, 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->scale.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->name, 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)
{
struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
struct perf_record_event_update *ev;
int err;
ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64));
if (!ev)
return -ENOMEM;
syn_data.data = &ev->cpus.cpus;
ev->header.type = PERF_RECORD_EVENT_UPDATE;
ev->header.size = (u16)syn_data.size;
ev->type = PERF_EVENT_UPDATE__CPUS;
ev->id = evsel->core.id[0];
cpu_map_data__synthesize(&syn_data);
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;
}
#ifdef HAVE_LIBTRACEEVENT
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;
}
#endif
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);
ev.build_id.size = min(pos->bid.size, sizeof(pos->bid.data));
memcpy(&ev.build_id.build_id, pos->bid.data, ev.build_id.size);
ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
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.user_requested_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;
}
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;
}
int perf_event__synthesize_for_pipe(struct perf_tool *tool,
struct perf_session *session,
struct perf_data *data,
perf_event__handler_t process)
{
int err;
int ret = 0;
struct evlist *evlist = session->evlist;
/*
* We need to synthesize events first, because some
* features works on top of them (on report side).
*/
err = perf_event__synthesize_attrs(tool, evlist, process);
if (err < 0) {
pr_err("Couldn't synthesize attrs.\n");
return err;
}
ret += err;
err = perf_event__synthesize_features(tool, session, evlist, process);
if (err < 0) {
pr_err("Couldn't synthesize features.\n");
return err;
}
ret += err;
#ifdef HAVE_LIBTRACEEVENT
if (have_tracepoints(&evlist->core.entries)) {
int fd = perf_data__fd(data);
/*
* FIXME err <= 0 here actually means that
* there were no tracepoints so its not really
* an error, just that we don't need to
* synthesize anything. We really have to
* return this more properly and also
* propagate errors that now are calling die()
*/
err = perf_event__synthesize_tracing_data(tool, fd, evlist,
process);
if (err <= 0) {
pr_err("Couldn't record tracing data.\n");
return err;
}
ret += err;
}
#else
(void)data;
#endif
return ret;
}
int parse_synth_opt(char *synth)
{
char *p, *q;
int ret = 0;
if (synth == NULL)
return -1;
for (q = synth; (p = strsep(&q, ",")); p = q) {
if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
return 0;
if (!strcasecmp(p, "all"))
return PERF_SYNTH_ALL;
if (!strcasecmp(p, "task"))
ret |= PERF_SYNTH_TASK;
else if (!strcasecmp(p, "mmap"))
ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
else if (!strcasecmp(p, "cgroup"))
ret |= PERF_SYNTH_CGROUP;
else
return -1;
}
return ret;
}
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