perf tools: Kill event_t typedef, use 'union perf_event' instead

[mirror_ubuntu-bionic-kernel.git] / tools / perf / builtin-record.c

/*
 * builtin-record.c
 *
 * Builtin record command: Record the profile of a workload
 * (or a CPU, or a PID) into the perf.data output file - for
 * later analysis via perf report.
 */
#define _FILE_OFFSET_BITS 64

#include "builtin.h"

#include "perf.h"

#include "util/build-id.h"
#include "util/util.h"
#include "util/parse-options.h"
#include "util/parse-events.h"

#include "util/header.h"
#include "util/event.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/debug.h"
#include "util/session.h"
#include "util/symbol.h"
#include "util/cpumap.h"
#include "util/thread_map.h"

#include <unistd.h>
#include <sched.h>
#include <sys/mman.h>

#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
#define SID(e, x, y) xyarray__entry(e->id, x, y)

enum write_mode_t {
        WRITE_FORCE,
        WRITE_APPEND
};

static u64                      user_interval                   = ULLONG_MAX;
static u64                      default_interval                =      0;
static u64                      sample_type;

static struct cpu_map           *cpus;
static unsigned int             page_size;
static unsigned int             mmap_pages                      =    128;
static unsigned int             user_freq                       = UINT_MAX;
static int                      freq                            =   1000;
static int                      output;
static int                      pipe_output                     =      0;
static const char               *output_name                    = NULL;
static int                      group                           =      0;
static int                      realtime_prio                   =      0;
static bool                     nodelay                         =  false;
static bool                     raw_samples                     =  false;
static bool                     sample_id_all_avail             =   true;
static bool                     system_wide                     =  false;
static pid_t                    target_pid                      =     -1;
static pid_t                    target_tid                      =     -1;
static struct thread_map        *threads;
static pid_t                    child_pid                       =     -1;
static bool                     no_inherit                      =  false;
static enum write_mode_t        write_mode                      = WRITE_FORCE;
static bool                     call_graph                      =  false;
static bool                     inherit_stat                    =  false;
static bool                     no_samples                      =  false;
static bool                     sample_address                  =  false;
static bool                     sample_time                     =  false;
static bool                     no_buildid                      =  false;
static bool                     no_buildid_cache                =  false;
static struct perf_evlist       *evsel_list;

static long                     samples                         =      0;
static u64                      bytes_written                   =      0;

static int                      file_new                        =      1;
static off_t                    post_processing_offset;

static struct perf_session      *session;
static const char               *cpu_list;

static void advance_output(size_t size)
{
        bytes_written += size;
}

static void write_output(void *buf, size_t size)
{
        while (size) {
                int ret = write(output, buf, size);

                if (ret < 0)
                        die("failed to write");

                size -= ret;
                buf += ret;

                bytes_written += ret;
        }
}

static int process_synthesized_event(union perf_event *event,
                                     struct perf_sample *sample __used,
                                     struct perf_session *self __used)
{
        write_output(event, event->header.size);
        return 0;
}

static void mmap_read(struct perf_mmap *md)
{
        unsigned int head = perf_mmap__read_head(md);
        unsigned int old = md->prev;
        unsigned char *data = md->base + page_size;
        unsigned long size;
        void *buf;

        if (old == head)
                return;

        samples++;

        size = head - old;

        if ((old & md->mask) + size != (head & md->mask)) {
                buf = &data[old & md->mask];
                size = md->mask + 1 - (old & md->mask);
                old += size;

                write_output(buf, size);
        }

        buf = &data[old & md->mask];
        size = head - old;
        old += size;

        write_output(buf, size);

        md->prev = old;
        perf_mmap__write_tail(md, old);
}

static volatile int done = 0;
static volatile int signr = -1;

static void sig_handler(int sig)
{
        done = 1;
        signr = sig;
}

static void sig_atexit(void)
{
        if (child_pid > 0)
                kill(child_pid, SIGTERM);

        if (signr == -1 || signr == SIGUSR1)
                return;

        signal(signr, SIG_DFL);
        kill(getpid(), signr);
}

static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
{
        struct perf_header_attr *h_attr;

        if (nr < session->header.attrs) {
                h_attr = session->header.attr[nr];
        } else {
                h_attr = perf_header_attr__new(a);
                if (h_attr != NULL)
                        if (perf_header__add_attr(&session->header, h_attr) < 0) {
                                perf_header_attr__delete(h_attr);
                                h_attr = NULL;
                        }
        }

        return h_attr;
}

static void create_counter(struct perf_evsel *evsel, int cpu)
{
        char *filter = evsel->filter;
        struct perf_event_attr *attr = &evsel->attr;
        struct perf_header_attr *h_attr;
        struct perf_sample_id *sid;
        int thread_index;
        int ret;

        for (thread_index = 0; thread_index < threads->nr; thread_index++) {
                h_attr = get_header_attr(attr, evsel->idx);
                if (h_attr == NULL)
                        die("nomem\n");

                if (!file_new) {
                        if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
                                fprintf(stderr, "incompatible append\n");
                                exit(-1);
                        }
                }

                sid = SID(evsel, cpu, thread_index);
                if (perf_header_attr__add_id(h_attr, sid->id) < 0) {
                        pr_warning("Not enough memory to add id\n");
                        exit(-1);
                }

                if (filter != NULL) {
                        ret = ioctl(FD(evsel, cpu, thread_index),
                                    PERF_EVENT_IOC_SET_FILTER, filter);
                        if (ret) {
                                error("failed to set filter with %d (%s)\n", errno,
                                                strerror(errno));
                                exit(-1);
                        }
                }
        }

        if (!sample_type)
                sample_type = attr->sample_type;
}

static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist)
{
        struct perf_event_attr *attr = &evsel->attr;
        int track = !evsel->idx; /* only the first counter needs these */

        attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
                                  PERF_FORMAT_TOTAL_TIME_RUNNING |
                                  PERF_FORMAT_ID;

        attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;

        if (evlist->nr_entries > 1)
                attr->sample_type |= PERF_SAMPLE_ID;

        /*
         * We default some events to a 1 default interval. But keep
         * it a weak assumption overridable by the user.
         */
        if (!attr->sample_period || (user_freq != UINT_MAX &&
                                     user_interval != ULLONG_MAX)) {
                if (freq) {
                        attr->sample_type       |= PERF_SAMPLE_PERIOD;
                        attr->freq              = 1;
                        attr->sample_freq       = freq;
                } else {
                        attr->sample_period = default_interval;
                }
        }

        if (no_samples)
                attr->sample_freq = 0;

        if (inherit_stat)
                attr->inherit_stat = 1;

        if (sample_address) {
                attr->sample_type       |= PERF_SAMPLE_ADDR;
                attr->mmap_data = track;
        }

        if (call_graph)
                attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;

        if (system_wide)
                attr->sample_type       |= PERF_SAMPLE_CPU;

        if (sample_id_all_avail &&
            (sample_time || system_wide || !no_inherit || cpu_list))
                attr->sample_type       |= PERF_SAMPLE_TIME;

        if (raw_samples) {
                attr->sample_type       |= PERF_SAMPLE_TIME;
                attr->sample_type       |= PERF_SAMPLE_RAW;
                attr->sample_type       |= PERF_SAMPLE_CPU;
        }

        if (nodelay) {
                attr->watermark = 0;
                attr->wakeup_events = 1;
        }

        attr->mmap              = track;
        attr->comm              = track;

        if (target_pid == -1 && target_tid == -1 && !system_wide) {
                attr->disabled = 1;
                attr->enable_on_exec = 1;
        }
}

static void open_counters(struct perf_evlist *evlist)
{
        struct perf_evsel *pos;
        int cpu;

        list_for_each_entry(pos, &evlist->entries, node) {
                struct perf_event_attr *attr = &pos->attr;
                /*
                 * Check if parse_single_tracepoint_event has already asked for
                 * PERF_SAMPLE_TIME.
                 *
                 * XXX this is kludgy but short term fix for problems introduced by
                 * eac23d1c that broke 'perf script' by having different sample_types
                 * when using multiple tracepoint events when we use a perf binary
                 * that tries to use sample_id_all on an older kernel.
                 *
                 * We need to move counter creation to perf_session, support
                 * different sample_types, etc.
                 */
                bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;

                config_attr(pos, evlist);
retry_sample_id:
                attr->sample_id_all = sample_id_all_avail ? 1 : 0;
try_again:
                if (perf_evsel__open(pos, cpus, threads, group, !no_inherit) < 0) {
                        int err = errno;

                        if (err == EPERM || err == EACCES)
                                die("Permission error - are you root?\n"
                                        "\t Consider tweaking"
                                        " /proc/sys/kernel/perf_event_paranoid.\n");
                        else if (err ==  ENODEV && cpu_list) {
                                die("No such device - did you specify"
                                        " an out-of-range profile CPU?\n");
                        } else if (err == EINVAL && sample_id_all_avail) {
                                /*
                                 * Old kernel, no attr->sample_id_type_all field
                                 */
                                sample_id_all_avail = false;
                                if (!sample_time && !raw_samples && !time_needed)
                                        attr->sample_type &= ~PERF_SAMPLE_TIME;

                                goto retry_sample_id;
                        }

                        /*
                         * If it's cycles then fall back to hrtimer
                         * based cpu-clock-tick sw counter, which
                         * is always available even if no PMU support:
                         */
                        if (attr->type == PERF_TYPE_HARDWARE
                                        && attr->config == PERF_COUNT_HW_CPU_CYCLES) {

                                if (verbose)
                                        warning(" ... trying to fall back to cpu-clock-ticks\n");
                                attr->type = PERF_TYPE_SOFTWARE;
                                attr->config = PERF_COUNT_SW_CPU_CLOCK;
                                goto try_again;
                        }
                        printf("\n");
                        error("sys_perf_event_open() syscall returned with %d (%s).  /bin/dmesg may provide additional information.\n",
                              err, strerror(err));

#if defined(__i386__) || defined(__x86_64__)
                        if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
                                die("No hardware sampling interrupt available."
                                    " No APIC? If so then you can boot the kernel"
                                    " with the \"lapic\" boot parameter to"
                                    " force-enable it.\n");
#endif

                        die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
                }
        }

        if (perf_evlist__mmap(evlist, cpus, threads, mmap_pages, false) < 0)
                die("failed to mmap with %d (%s)\n", errno, strerror(errno));

        for (cpu = 0; cpu < cpus->nr; ++cpu) {
                list_for_each_entry(pos, &evlist->entries, node)
                        create_counter(pos, cpu);
        }
}

static int process_buildids(void)
{
        u64 size = lseek(output, 0, SEEK_CUR);

        if (size == 0)
                return 0;

        session->fd = output;
        return __perf_session__process_events(session, post_processing_offset,
                                              size - post_processing_offset,
                                              size, &build_id__mark_dso_hit_ops);
}

static void atexit_header(void)
{
        if (!pipe_output) {
                session->header.data_size += bytes_written;

                if (!no_buildid)
                        process_buildids();
                perf_header__write(&session->header, evsel_list, output, true);
                perf_session__delete(session);
                perf_evlist__delete(evsel_list);
                symbol__exit();
        }
}

static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
{
        int err;
        struct perf_session *psession = data;

        if (machine__is_host(machine))
                return;

        /*
         *As for guest kernel when processing subcommand record&report,
         *we arrange module mmap prior to guest kernel mmap and trigger
         *a preload dso because default guest module symbols are loaded
         *from guest kallsyms instead of /lib/modules/XXX/XXX. This
         *method is used to avoid symbol missing when the first addr is
         *in module instead of in guest kernel.
         */
        err = perf_event__synthesize_modules(process_synthesized_event,
                                             psession, machine);
        if (err < 0)
                pr_err("Couldn't record guest kernel [%d]'s reference"
                       " relocation symbol.\n", machine->pid);

        /*
         * We use _stext for guest kernel because guest kernel's /proc/kallsyms
         * have no _text sometimes.
         */
        err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
                                                 psession, machine, "_text");
        if (err < 0)
                err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
                                                         psession, machine,
                                                         "_stext");
        if (err < 0)
                pr_err("Couldn't record guest kernel [%d]'s reference"
                       " relocation symbol.\n", machine->pid);
}

static struct perf_event_header finished_round_event = {
        .size = sizeof(struct perf_event_header),
        .type = PERF_RECORD_FINISHED_ROUND,
};

static void mmap_read_all(void)
{
        int i;

        for (i = 0; i < cpus->nr; i++) {
                if (evsel_list->mmap[i].base)
                        mmap_read(&evsel_list->mmap[i]);
        }

        if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
                write_output(&finished_round_event, sizeof(finished_round_event));
}

static int __cmd_record(int argc, const char **argv)
{
        int i;
        struct stat st;
        int flags;
        int err;
        unsigned long waking = 0;
        int child_ready_pipe[2], go_pipe[2];
        const bool forks = argc > 0;
        char buf;
        struct machine *machine;

        page_size = sysconf(_SC_PAGE_SIZE);

        atexit(sig_atexit);
        signal(SIGCHLD, sig_handler);
        signal(SIGINT, sig_handler);
        signal(SIGUSR1, sig_handler);

        if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
                perror("failed to create pipes");
                exit(-1);
        }

        if (!output_name) {
                if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
                        pipe_output = 1;
                else
                        output_name = "perf.data";
        }
        if (output_name) {
                if (!strcmp(output_name, "-"))
                        pipe_output = 1;
                else if (!stat(output_name, &st) && st.st_size) {
                        if (write_mode == WRITE_FORCE) {
                                char oldname[PATH_MAX];
                                snprintf(oldname, sizeof(oldname), "%s.old",
                                         output_name);
                                unlink(oldname);
                                rename(output_name, oldname);
                        }
                } else if (write_mode == WRITE_APPEND) {
                        write_mode = WRITE_FORCE;
                }
        }

        flags = O_CREAT|O_RDWR;
        if (write_mode == WRITE_APPEND)
                file_new = 0;
        else
                flags |= O_TRUNC;

        if (pipe_output)
                output = STDOUT_FILENO;
        else
                output = open(output_name, flags, S_IRUSR | S_IWUSR);
        if (output < 0) {
                perror("failed to create output file");
                exit(-1);
        }

        session = perf_session__new(output_name, O_WRONLY,
                                    write_mode == WRITE_FORCE, false, NULL);
        if (session == NULL) {
                pr_err("Not enough memory for reading perf file header\n");
                return -1;
        }

        if (!no_buildid)
                perf_header__set_feat(&session->header, HEADER_BUILD_ID);

        if (!file_new) {
                err = perf_header__read(session, output);
                if (err < 0)
                        goto out_delete_session;
        }

        if (have_tracepoints(&evsel_list->entries))
                perf_header__set_feat(&session->header, HEADER_TRACE_INFO);

        /*
         * perf_session__delete(session) will be called at atexit_header()
         */
        atexit(atexit_header);

        if (forks) {
                child_pid = fork();
                if (child_pid < 0) {
                        perror("failed to fork");
                        exit(-1);
                }

                if (!child_pid) {
                        if (pipe_output)
                                dup2(2, 1);
                        close(child_ready_pipe[0]);
                        close(go_pipe[1]);
                        fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);

                        /*
                         * Do a dummy execvp to get the PLT entry resolved,
                         * so we avoid the resolver overhead on the real
                         * execvp call.
                         */
                        execvp("", (char **)argv);

                        /*
                         * Tell the parent we're ready to go
                         */
                        close(child_ready_pipe[1]);

                        /*
                         * Wait until the parent tells us to go.
                         */
                        if (read(go_pipe[0], &buf, 1) == -1)
                                perror("unable to read pipe");

                        execvp(argv[0], (char **)argv);

                        perror(argv[0]);
                        kill(getppid(), SIGUSR1);
                        exit(-1);
                }

                if (!system_wide && target_tid == -1 && target_pid == -1)
                        threads->map[0] = child_pid;

                close(child_ready_pipe[1]);
                close(go_pipe[0]);
                /*
                 * wait for child to settle
                 */
                if (read(child_ready_pipe[0], &buf, 1) == -1) {
                        perror("unable to read pipe");
                        exit(-1);
                }
                close(child_ready_pipe[0]);
        }

        open_counters(evsel_list);

        perf_session__set_sample_type(session, sample_type);

        if (pipe_output) {
                err = perf_header__write_pipe(output);
                if (err < 0)
                        return err;
        } else if (file_new) {
                err = perf_header__write(&session->header, evsel_list,
                                         output, false);
                if (err < 0)
                        return err;
        }

        post_processing_offset = lseek(output, 0, SEEK_CUR);

        perf_session__set_sample_id_all(session, sample_id_all_avail);

        if (pipe_output) {
                err = perf_event__synthesize_attrs(&session->header,
                                                   process_synthesized_event,
                                                   session);
                if (err < 0) {
                        pr_err("Couldn't synthesize attrs.\n");
                        return err;
                }

                err = perf_event__synthesize_event_types(process_synthesized_event,
                                                         session);
                if (err < 0) {
                        pr_err("Couldn't synthesize event_types.\n");
                        return err;
                }

                if (have_tracepoints(&evsel_list->entries)) {
                        /*
                         * 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(output, evsel_list,
                                                                  process_synthesized_event,
                                                                  session);
                        if (err <= 0) {
                                pr_err("Couldn't record tracing data.\n");
                                return err;
                        }
                        advance_output(err);
                }
        }

        machine = perf_session__find_host_machine(session);
        if (!machine) {
                pr_err("Couldn't find native kernel information.\n");
                return -1;
        }

        err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
                                                 session, machine, "_text");
        if (err < 0)
                err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
                                                         session, machine, "_stext");
        if (err < 0)
                pr_err("Couldn't record kernel reference relocation symbol\n"
                       "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
                       "Check /proc/kallsyms permission or run as root.\n");

        err = perf_event__synthesize_modules(process_synthesized_event,
                                             session, machine);
        if (err < 0)
                pr_err("Couldn't record kernel module information.\n"
                       "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
                       "Check /proc/modules permission or run as root.\n");

        if (perf_guest)
                perf_session__process_machines(session,
                                               perf_event__synthesize_guest_os);

        if (!system_wide)
                perf_event__synthesize_thread(target_tid,
                                              process_synthesized_event,
                                              session);
        else
                perf_event__synthesize_threads(process_synthesized_event,
                                               session);

        if (realtime_prio) {
                struct sched_param param;

                param.sched_priority = realtime_prio;
                if (sched_setscheduler(0, SCHED_FIFO, &param)) {
                        pr_err("Could not set realtime priority.\n");
                        exit(-1);
                }
        }

        /*
         * Let the child rip
         */
        if (forks)
                close(go_pipe[1]);

        for (;;) {
                int hits = samples;
                int thread;

                mmap_read_all();

                if (hits == samples) {
                        if (done)
                                break;
                        err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
                        waking++;
                }

                if (done) {
                        for (i = 0; i < cpus->nr; i++) {
                                struct perf_evsel *pos;

                                list_for_each_entry(pos, &evsel_list->entries, node) {
                                        for (thread = 0;
                                                thread < threads->nr;
                                                thread++)
                                                ioctl(FD(pos, i, thread),
                                                        PERF_EVENT_IOC_DISABLE);
                                }
                        }
                }
        }

        if (quiet || signr == SIGUSR1)
                return 0;

        fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);

        /*
         * Approximate RIP event size: 24 bytes.
         */
        fprintf(stderr,
                "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
                (double)bytes_written / 1024.0 / 1024.0,
                output_name,
                bytes_written / 24);

        return 0;

out_delete_session:
        perf_session__delete(session);
        return err;
}

static const char * const record_usage[] = {
        "perf record [<options>] [<command>]",
        "perf record [<options>] -- <command> [<options>]",
        NULL
};

static bool force, append_file;

const struct option record_options[] = {
        OPT_CALLBACK('e', "event", &evsel_list, "event",
                     "event selector. use 'perf list' to list available events",
                     parse_events),
        OPT_CALLBACK(0, "filter", &evsel_list, "filter",
                     "event filter", parse_filter),
        OPT_INTEGER('p', "pid", &target_pid,
                    "record events on existing process id"),
        OPT_INTEGER('t', "tid", &target_tid,
                    "record events on existing thread id"),
        OPT_INTEGER('r', "realtime", &realtime_prio,
                    "collect data with this RT SCHED_FIFO priority"),
        OPT_BOOLEAN('D', "no-delay", &nodelay,
                    "collect data without buffering"),
        OPT_BOOLEAN('R', "raw-samples", &raw_samples,
                    "collect raw sample records from all opened counters"),
        OPT_BOOLEAN('a', "all-cpus", &system_wide,
                            "system-wide collection from all CPUs"),
        OPT_BOOLEAN('A', "append", &append_file,
                            "append to the output file to do incremental profiling"),
        OPT_STRING('C', "cpu", &cpu_list, "cpu",
                    "list of cpus to monitor"),
        OPT_BOOLEAN('f', "force", &force,
                        "overwrite existing data file (deprecated)"),
        OPT_U64('c', "count", &user_interval, "event period to sample"),
        OPT_STRING('o', "output", &output_name, "file",
                    "output file name"),
        OPT_BOOLEAN('i', "no-inherit", &no_inherit,
                    "child tasks do not inherit counters"),
        OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
        OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
        OPT_BOOLEAN('g', "call-graph", &call_graph,
                    "do call-graph (stack chain/backtrace) recording"),
        OPT_INCR('v', "verbose", &verbose,
                    "be more verbose (show counter open errors, etc)"),
        OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
        OPT_BOOLEAN('s', "stat", &inherit_stat,
                    "per thread counts"),
        OPT_BOOLEAN('d', "data", &sample_address,
                    "Sample addresses"),
        OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"),
        OPT_BOOLEAN('n', "no-samples", &no_samples,
                    "don't sample"),
        OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache,
                    "do not update the buildid cache"),
        OPT_BOOLEAN('B', "no-buildid", &no_buildid,
                    "do not collect buildids in perf.data"),
        OPT_END()
};

int cmd_record(int argc, const char **argv, const char *prefix __used)
{
        int err = -ENOMEM;
        struct perf_evsel *pos;

        evsel_list = perf_evlist__new();
        if (evsel_list == NULL)
                return -ENOMEM;

        argc = parse_options(argc, argv, record_options, record_usage,
                            PARSE_OPT_STOP_AT_NON_OPTION);
        if (!argc && target_pid == -1 && target_tid == -1 &&
                !system_wide && !cpu_list)
                usage_with_options(record_usage, record_options);

        if (force && append_file) {
                fprintf(stderr, "Can't overwrite and append at the same time."
                                " You need to choose between -f and -A");
                usage_with_options(record_usage, record_options);
        } else if (append_file) {
                write_mode = WRITE_APPEND;
        } else {
                write_mode = WRITE_FORCE;
        }

        symbol__init();

        if (no_buildid_cache || no_buildid)
                disable_buildid_cache();

        if (evsel_list->nr_entries == 0 &&
            perf_evlist__add_default(evsel_list) < 0) {
                pr_err("Not enough memory for event selector list\n");
                goto out_symbol_exit;
        }

        if (target_pid != -1)
                target_tid = target_pid;

        threads = thread_map__new(target_pid, target_tid);
        if (threads == NULL) {
                pr_err("Problems finding threads of monitor\n");
                usage_with_options(record_usage, record_options);
        }

        if (target_tid != -1)
                cpus = cpu_map__dummy_new();
        else
                cpus = cpu_map__new(cpu_list);

        if (cpus == NULL)
                usage_with_options(record_usage, record_options);

        list_for_each_entry(pos, &evsel_list->entries, node) {
                if (perf_evsel__alloc_fd(pos, cpus->nr, threads->nr) < 0)
                        goto out_free_fd;
                if (perf_header__push_event(pos->attr.config, event_name(pos)))
                        goto out_free_fd;
        }

        if (perf_evlist__alloc_pollfd(evsel_list, cpus->nr, threads->nr) < 0)
                goto out_free_fd;

        if (user_interval != ULLONG_MAX)
                default_interval = user_interval;
        if (user_freq != UINT_MAX)
                freq = user_freq;

        /*
         * User specified count overrides default frequency.
         */
        if (default_interval)
                freq = 0;
        else if (freq) {
                default_interval = freq;
        } else {
                fprintf(stderr, "frequency and count are zero, aborting\n");
                err = -EINVAL;
                goto out_free_fd;
        }

        err = __cmd_record(argc, argv);

out_free_fd:
        thread_map__delete(threads);
        threads = NULL;
out_symbol_exit:
        symbol__exit();
        return err;
}