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-rw-r--r--tools/perf/util/synthetic-events.c2406
1 files changed, 2406 insertions, 0 deletions
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
new file mode 100644
index 000000000..cccd293b5
--- /dev/null
+++ b/tools/perf/util/synthetic-events.c
@@ -0,0 +1,2406 @@
+// 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;
+}
+
+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->bid.data, sizeof(pos->bid.data));
+ 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.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;
+
+ 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;
+ }
+
+ 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;
+}