builtin-timechart.c

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/*
 * builtin-timechart.c - make an svg timechart of system activity
 *
 * (C) Copyright 2009 Intel Corporation
 *
 * Authors:
 *     Arjan van de Ven <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */

#include "builtin.h"

#include "util/util.h"

#include "util/color.h"
#include <linux/list.h>
#include "util/cache.h"
#include "util/evsel.h"
#include <linux/rbtree.h>
#include "util/symbol.h"
#include "util/callchain.h"
#include "util/strlist.h"

#include "perf.h"
#include "util/header.h"
#include "util/parse-options.h"
#include "util/parse-events.h"
#include "util/event.h"
#include "util/session.h"
#include "util/svghelper.h"
#include "util/tool.h"

#define SUPPORT_OLD_POWER_EVENTS 1
#define PWR_EVENT_EXIT -1


static unsigned int numcpus;
static u64      min_freq;   /* Lowest CPU frequency seen */
static u64      max_freq;   /* Highest CPU frequency seen */
static u64      turbo_frequency;

static u64      first_time, last_time;

static bool     power_only;


struct per_pid;
struct per_pidcomm;

struct cpu_sample;
struct power_event;
struct wake_event;

struct sample_wrapper;

/*
 * Datastructure layout:
 * We keep an list of "pid"s, matching the kernels notion of a task struct.
 * Each "pid" entry, has a list of "comm"s.
 *  this is because we want to track different programs different, while
 *  exec will reuse the original pid (by design).
 * Each comm has a list of samples that will be used to draw
 * final graph.
 */

struct per_pid {
    struct per_pid *next;

    int     pid;
    int     ppid;

    u64     start_time;
    u64     end_time;
    u64     total_time;
    int     display;

    struct per_pidcomm *all;
    struct per_pidcomm *current;
};


struct per_pidcomm {
    struct per_pidcomm *next;

    u64     start_time;
    u64     end_time;
    u64     total_time;

    int     Y;
    int     display;

    long        state;
    u64     state_since;

    char        *comm;

    struct cpu_sample *samples;
};

struct sample_wrapper {
    struct sample_wrapper *next;

    u64     timestamp;
    unsigned char   data[0];
};

#define TYPE_NONE   0
#define TYPE_RUNNING    1
#define TYPE_WAITING    2
#define TYPE_BLOCKED    3

struct cpu_sample {
    struct cpu_sample *next;

    u64 start_time;
    u64 end_time;
    int type;
    int cpu;
};

static struct per_pid *all_data;

#define CSTATE 1
#define PSTATE 2

struct power_event {
    struct power_event *next;
    int type;
    int state;
    u64 start_time;
    u64 end_time;
    int cpu;
};

struct wake_event {
    struct wake_event *next;
    int waker;
    int wakee;
    u64 time;
};

static struct power_event    *power_events;
static struct wake_event     *wake_events;

struct process_filter;
struct process_filter {
    char            *name;
    int         pid;
    struct process_filter   *next;
};

static struct process_filter *process_filter;


static struct per_pid *find_create_pid(int pid)
{
    struct per_pid *cursor = all_data;

    while (cursor) {
        if (cursor->pid == pid)
            return cursor;
        cursor = cursor->next;
    }
    cursor = zalloc(sizeof(*cursor));
    assert(cursor != NULL);
    cursor->pid = pid;
    cursor->next = all_data;
    all_data = cursor;
    return cursor;
}

static void pid_set_comm(int pid, char *comm)
{
    struct per_pid *p;
    struct per_pidcomm *c;
    p = find_create_pid(pid);
    c = p->all;
    while (c) {
        if (c->comm && strcmp(c->comm, comm) == 0) {
            p->current = c;
            return;
        }
        if (!c->comm) {
            c->comm = strdup(comm);
            p->current = c;
            return;
        }
        c = c->next;
    }
    c = zalloc(sizeof(*c));
    assert(c != NULL);
    c->comm = strdup(comm);
    p->current = c;
    c->next = p->all;
    p->all = c;
}

static void pid_fork(int pid, int ppid, u64 timestamp)
{
    struct per_pid *p, *pp;
    p = find_create_pid(pid);
    pp = find_create_pid(ppid);
    p->ppid = ppid;
    if (pp->current && pp->current->comm && !p->current)
        pid_set_comm(pid, pp->current->comm);

    p->start_time = timestamp;
    if (p->current) {
        p->current->start_time = timestamp;
        p->current->state_since = timestamp;
    }
}

static void pid_exit(int pid, u64 timestamp)
{
    struct per_pid *p;
    p = find_create_pid(pid);
    p->end_time = timestamp;
    if (p->current)
        p->current->end_time = timestamp;
}

static void
pid_put_sample(int pid, int type, unsigned int cpu, u64 start, u64 end)
{
    struct per_pid *p;
    struct per_pidcomm *c;
    struct cpu_sample *sample;

    p = find_create_pid(pid);
    c = p->current;
    if (!c) {
        c = zalloc(sizeof(*c));
        assert(c != NULL);
        p->current = c;
        c->next = p->all;
        p->all = c;
    }

    sample = zalloc(sizeof(*sample));
    assert(sample != NULL);
    sample->start_time = start;
    sample->end_time = end;
    sample->type = type;
    sample->next = c->samples;
    sample->cpu = cpu;
    c->samples = sample;

    if (sample->type == TYPE_RUNNING && end > start && start > 0) {
        c->total_time += (end-start);
        p->total_time += (end-start);
    }

    if (c->start_time == 0 || c->start_time > start)
        c->start_time = start;
    if (p->start_time == 0 || p->start_time > start)
        p->start_time = start;
}

#define MAX_CPUS 4096

static u64 cpus_cstate_start_times[MAX_CPUS];
static int cpus_cstate_state[MAX_CPUS];
static u64 cpus_pstate_start_times[MAX_CPUS];
static u64 cpus_pstate_state[MAX_CPUS];

static int process_comm_event(struct perf_tool *tool __maybe_unused,
                  union perf_event *event,
                  struct perf_sample *sample __maybe_unused,
                  struct machine *machine __maybe_unused)
{
    pid_set_comm(event->comm.tid, event->comm.comm);
    return 0;
}

static int process_fork_event(struct perf_tool *tool __maybe_unused,
                  union perf_event *event,
                  struct perf_sample *sample __maybe_unused,
                  struct machine *machine __maybe_unused)
{
    pid_fork(event->fork.pid, event->fork.ppid, event->fork.time);
    return 0;
}

static int process_exit_event(struct perf_tool *tool __maybe_unused,
                  union perf_event *event,
                  struct perf_sample *sample __maybe_unused,
                  struct machine *machine __maybe_unused)
{
    pid_exit(event->fork.pid, event->fork.time);
    return 0;
}

struct trace_entry {
    unsigned short      type;
    unsigned char       flags;
    unsigned char       preempt_count;
    int         pid;
    int         lock_depth;
};

#ifdef SUPPORT_OLD_POWER_EVENTS
static int use_old_power_events;
struct power_entry_old {
    struct trace_entry te;
    u64 type;
    u64 value;
    u64 cpu_id;
};
#endif

struct power_processor_entry {
    struct trace_entry te;
    u32 state;
    u32 cpu_id;
};

#define TASK_COMM_LEN 16
struct wakeup_entry {
    struct trace_entry te;
    char comm[TASK_COMM_LEN];
    int   pid;
    int   prio;
    int   success;
};

/*
 * trace_flag_type is an enumeration that holds different
 * states when a trace occurs. These are:
 *  IRQS_OFF            - interrupts were disabled
 *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
 *  NEED_RESCED         - reschedule is requested
 *  HARDIRQ             - inside an interrupt handler
 *  SOFTIRQ             - inside a softirq handler
 */
enum trace_flag_type {
    TRACE_FLAG_IRQS_OFF     = 0x01,
    TRACE_FLAG_IRQS_NOSUPPORT   = 0x02,
    TRACE_FLAG_NEED_RESCHED     = 0x04,
    TRACE_FLAG_HARDIRQ      = 0x08,
    TRACE_FLAG_SOFTIRQ      = 0x10,
};



struct sched_switch {
    struct trace_entry te;
    char prev_comm[TASK_COMM_LEN];
    int  prev_pid;
    int  prev_prio;
    long prev_state; /* Arjan weeps. */
    char next_comm[TASK_COMM_LEN];
    int  next_pid;
    int  next_prio;
};

static void c_state_start(int cpu, u64 timestamp, int state)
{
    cpus_cstate_start_times[cpu] = timestamp;
    cpus_cstate_state[cpu] = state;
}

static void c_state_end(int cpu, u64 timestamp)
{
    struct power_event *pwr = zalloc(sizeof(*pwr));

    if (!pwr)
        return;

    pwr->state = cpus_cstate_state[cpu];
    pwr->start_time = cpus_cstate_start_times[cpu];
    pwr->end_time = timestamp;
    pwr->cpu = cpu;
    pwr->type = CSTATE;
    pwr->next = power_events;

    power_events = pwr;
}

static void p_state_change(int cpu, u64 timestamp, u64 new_freq)
{
    struct power_event *pwr;

    if (new_freq > 8000000) /* detect invalid data */
        return;

    pwr = zalloc(sizeof(*pwr));
    if (!pwr)
        return;

    pwr->state = cpus_pstate_state[cpu];
    pwr->start_time = cpus_pstate_start_times[cpu];
    pwr->end_time = timestamp;
    pwr->cpu = cpu;
    pwr->type = PSTATE;
    pwr->next = power_events;

    if (!pwr->start_time)
        pwr->start_time = first_time;

    power_events = pwr;

    cpus_pstate_state[cpu] = new_freq;
    cpus_pstate_start_times[cpu] = timestamp;

    if ((u64)new_freq > max_freq)
        max_freq = new_freq;

    if (new_freq < min_freq || min_freq == 0)
        min_freq = new_freq;

    if (new_freq == max_freq - 1000)
            turbo_frequency = max_freq;
}

static void
sched_wakeup(int cpu, u64 timestamp, int pid, struct trace_entry *te)
{
    struct per_pid *p;
    struct wakeup_entry *wake = (void *)te;
    struct wake_event *we = zalloc(sizeof(*we));

    if (!we)
        return;

    we->time = timestamp;
    we->waker = pid;

    if ((te->flags & TRACE_FLAG_HARDIRQ) || (te->flags & TRACE_FLAG_SOFTIRQ))
        we->waker = -1;

    we->wakee = wake->pid;
    we->next = wake_events;
    wake_events = we;
    p = find_create_pid(we->wakee);

    if (p && p->current && p->current->state == TYPE_NONE) {
        p->current->state_since = timestamp;
        p->current->state = TYPE_WAITING;
    }
    if (p && p->current && p->current->state == TYPE_BLOCKED) {
        pid_put_sample(p->pid, p->current->state, cpu, p->current->state_since, timestamp);
        p->current->state_since = timestamp;
        p->current->state = TYPE_WAITING;
    }
}

static void sched_switch(int cpu, u64 timestamp, struct trace_entry *te)
{
    struct per_pid *p = NULL, *prev_p;
    struct sched_switch *sw = (void *)te;


    prev_p = find_create_pid(sw->prev_pid);

    p = find_create_pid(sw->next_pid);

    if (prev_p->current && prev_p->current->state != TYPE_NONE)
        pid_put_sample(sw->prev_pid, TYPE_RUNNING, cpu, prev_p->current->state_since, timestamp);
    if (p && p->current) {
        if (p->current->state != TYPE_NONE)
            pid_put_sample(sw->next_pid, p->current->state, cpu, p->current->state_since, timestamp);

        p->current->state_since = timestamp;
        p->current->state = TYPE_RUNNING;
    }

    if (prev_p->current) {
        prev_p->current->state = TYPE_NONE;
        prev_p->current->state_since = timestamp;
        if (sw->prev_state & 2)
            prev_p->current->state = TYPE_BLOCKED;
        if (sw->prev_state == 0)
            prev_p->current->state = TYPE_WAITING;
    }
}


static int process_sample_event(struct perf_tool *tool __maybe_unused,
                union perf_event *event __maybe_unused,
                struct perf_sample *sample,
                struct perf_evsel *evsel,
                struct machine *machine __maybe_unused)
{
    struct trace_entry *te;

    if (evsel->attr.sample_type & PERF_SAMPLE_TIME) {
        if (!first_time || first_time > sample->time)
            first_time = sample->time;
        if (last_time < sample->time)
            last_time = sample->time;
    }

    te = (void *)sample->raw_data;
    if ((evsel->attr.sample_type & PERF_SAMPLE_RAW) && sample->raw_size > 0) {
        char *event_str;
#ifdef SUPPORT_OLD_POWER_EVENTS
        struct power_entry_old *peo;
        peo = (void *)te;
#endif
        /*
         * FIXME: use evsel, its already mapped from id to perf_evsel,
         * remove perf_header__find_event infrastructure bits.
         * Mapping all these "power:cpu_idle" strings to the tracepoint
         * ID and then just comparing against evsel->attr.config.
         *
         * e.g.:
         *
         * if (evsel->attr.config == power_cpu_idle_id)
         */
        event_str = perf_header__find_event(te->type);

        if (!event_str)
            return 0;

        if (sample->cpu > numcpus)
            numcpus = sample->cpu;

        if (strcmp(event_str, "power:cpu_idle") == 0) {
            struct power_processor_entry *ppe = (void *)te;
            if (ppe->state == (u32)PWR_EVENT_EXIT)
                c_state_end(ppe->cpu_id, sample->time);
            else
                c_state_start(ppe->cpu_id, sample->time,
                          ppe->state);
        }
        else if (strcmp(event_str, "power:cpu_frequency") == 0) {
            struct power_processor_entry *ppe = (void *)te;
            p_state_change(ppe->cpu_id, sample->time, ppe->state);
        }

        else if (strcmp(event_str, "sched:sched_wakeup") == 0)
            sched_wakeup(sample->cpu, sample->time, sample->pid, te);

        else if (strcmp(event_str, "sched:sched_switch") == 0)
            sched_switch(sample->cpu, sample->time, te);

#ifdef SUPPORT_OLD_POWER_EVENTS
        if (use_old_power_events) {
            if (strcmp(event_str, "power:power_start") == 0)
                c_state_start(peo->cpu_id, sample->time,
                          peo->value);

            else if (strcmp(event_str, "power:power_end") == 0)
                c_state_end(sample->cpu, sample->time);

            else if (strcmp(event_str,
                    "power:power_frequency") == 0)
                p_state_change(peo->cpu_id, sample->time,
                           peo->value);
        }
#endif
    }
    return 0;
}

/*
 * After the last sample we need to wrap up the current C/P state
 * and close out each CPU for these.
 */
static void end_sample_processing(void)
{
    u64 cpu;
    struct power_event *pwr;

    for (cpu = 0; cpu <= numcpus; cpu++) {
        /* C state */
#if 0
        pwr = zalloc(sizeof(*pwr));
        if (!pwr)
            return;

        pwr->state = cpus_cstate_state[cpu];
        pwr->start_time = cpus_cstate_start_times[cpu];
        pwr->end_time = last_time;
        pwr->cpu = cpu;
        pwr->type = CSTATE;
        pwr->next = power_events;

        power_events = pwr;
#endif
        /* P state */

        pwr = zalloc(sizeof(*pwr));
        if (!pwr)
            return;

        pwr->state = cpus_pstate_state[cpu];
        pwr->start_time = cpus_pstate_start_times[cpu];
        pwr->end_time = last_time;
        pwr->cpu = cpu;
        pwr->type = PSTATE;
        pwr->next = power_events;

        if (!pwr->start_time)
            pwr->start_time = first_time;
        if (!pwr->state)
            pwr->state = min_freq;
        power_events = pwr;
    }
}

/*
 * Sort the pid datastructure
 */
static void sort_pids(void)
{
    struct per_pid *new_list, *p, *cursor, *prev;
    /* sort by ppid first, then by pid, lowest to highest */

    new_list = NULL;

    while (all_data) {
        p = all_data;
        all_data = p->next;
        p->next = NULL;

        if (new_list == NULL) {
            new_list = p;
            p->next = NULL;
            continue;
        }
        prev = NULL;
        cursor = new_list;
        while (cursor) {
            if (cursor->ppid > p->ppid ||
                (cursor->ppid == p->ppid && cursor->pid > p->pid)) {
                /* must insert before */
                if (prev) {
                    p->next = prev->next;
                    prev->next = p;
                    cursor = NULL;
                    continue;
                } else {
                    p->next = new_list;
                    new_list = p;
                    cursor = NULL;
                    continue;
                }
            }

            prev = cursor;
            cursor = cursor->next;
            if (!cursor)
                prev->next = p;
        }
    }
    all_data = new_list;
}


static void draw_c_p_states(void)
{
    struct power_event *pwr;
    pwr = power_events;

    /*
     * two pass drawing so that the P state bars are on top of the C state blocks
     */
    while (pwr) {
        if (pwr->type == CSTATE)
            svg_cstate(pwr->cpu, pwr->start_time, pwr->end_time, pwr->state);
        pwr = pwr->next;
    }

    pwr = power_events;
    while (pwr) {
        if (pwr->type == PSTATE) {
            if (!pwr->state)
                pwr->state = min_freq;
            svg_pstate(pwr->cpu, pwr->start_time, pwr->end_time, pwr->state);
        }
        pwr = pwr->next;
    }
}

static void draw_wakeups(void)
{
    struct wake_event *we;
    struct per_pid *p;
    struct per_pidcomm *c;

    we = wake_events;
    while (we) {
        int from = 0, to = 0;
        char *task_from = NULL, *task_to = NULL;

        /* locate the column of the waker and wakee */
        p = all_data;
        while (p) {
            if (p->pid == we->waker || p->pid == we->wakee) {
                c = p->all;
                while (c) {
                    if (c->Y && c->start_time <= we->time && c->end_time >= we->time) {
                        if (p->pid == we->waker && !from) {
                            from = c->Y;
                            task_from = strdup(c->comm);
                        }
                        if (p->pid == we->wakee && !to) {
                            to = c->Y;
                            task_to = strdup(c->comm);
                        }
                    }
                    c = c->next;
                }
                c = p->all;
                while (c) {
                    if (p->pid == we->waker && !from) {
                        from = c->Y;
                        task_from = strdup(c->comm);
                    }
                    if (p->pid == we->wakee && !to) {
                        to = c->Y;
                        task_to = strdup(c->comm);
                    }
                    c = c->next;
                }
            }
            p = p->next;
        }

        if (!task_from) {
            task_from = malloc(40);
            sprintf(task_from, "[%i]", we->waker);
        }
        if (!task_to) {
            task_to = malloc(40);
            sprintf(task_to, "[%i]", we->wakee);
        }

        if (we->waker == -1)
            svg_interrupt(we->time, to);
        else if (from && to && abs(from - to) == 1)
            svg_wakeline(we->time, from, to);
        else
            svg_partial_wakeline(we->time, from, task_from, to, task_to);
        we = we->next;

        free(task_from);
        free(task_to);
    }
}

static void draw_cpu_usage(void)
{
    struct per_pid *p;
    struct per_pidcomm *c;
    struct cpu_sample *sample;
    p = all_data;
    while (p) {
        c = p->all;
        while (c) {
            sample = c->samples;
            while (sample) {
                if (sample->type == TYPE_RUNNING)
                    svg_process(sample->cpu, sample->start_time, sample->end_time, "sample", c->comm);

                sample = sample->next;
            }
            c = c->next;
        }
        p = p->next;
    }
}

static void draw_process_bars(void)
{
    struct per_pid *p;
    struct per_pidcomm *c;
    struct cpu_sample *sample;
    int Y = 0;

    Y = 2 * numcpus + 2;

    p = all_data;
    while (p) {
        c = p->all;
        while (c) {
            if (!c->display) {
                c->Y = 0;
                c = c->next;
                continue;
            }

            svg_box(Y, c->start_time, c->end_time, "process");
            sample = c->samples;
            while (sample) {
                if (sample->type == TYPE_RUNNING)
                    svg_sample(Y, sample->cpu, sample->start_time, sample->end_time);
                if (sample->type == TYPE_BLOCKED)
                    svg_box(Y, sample->start_time, sample->end_time, "blocked");
                if (sample->type == TYPE_WAITING)
                    svg_waiting(Y, sample->start_time, sample->end_time);
                sample = sample->next;
            }

            if (c->comm) {
                char comm[256];
                if (c->total_time > 5000000000) /* 5 seconds */
                    sprintf(comm, "%s:%i (%2.2fs)", c->comm, p->pid, c->total_time / 1000000000.0);
                else
                    sprintf(comm, "%s:%i (%3.1fms)", c->comm, p->pid, c->total_time / 1000000.0);

                svg_text(Y, c->start_time, comm);
            }
            c->Y = Y;
            Y++;
            c = c->next;
        }
        p = p->next;
    }
}

static void add_process_filter(const char *string)
{
    int pid = strtoull(string, NULL, 10);
    struct process_filter *filt = malloc(sizeof(*filt));

    if (!filt)
        return;

    filt->name = strdup(string);
    filt->pid  = pid;
    filt->next = process_filter;

    process_filter = filt;
}

static int passes_filter(struct per_pid *p, struct per_pidcomm *c)
{
    struct process_filter *filt;
    if (!process_filter)
        return 1;

    filt = process_filter;
    while (filt) {
        if (filt->pid && p->pid == filt->pid)
            return 1;
        if (strcmp(filt->name, c->comm) == 0)
            return 1;
        filt = filt->next;
    }
    return 0;
}

static int determine_display_tasks_filtered(void)
{
    struct per_pid *p;
    struct per_pidcomm *c;
    int count = 0;

    p = all_data;
    while (p) {
        p->display = 0;
        if (p->start_time == 1)
            p->start_time = first_time;

        /* no exit marker, task kept running to the end */
        if (p->end_time == 0)
            p->end_time = last_time;

        c = p->all;

        while (c) {
            c->display = 0;

            if (c->start_time == 1)
                c->start_time = first_time;

            if (passes_filter(p, c)) {
                c->display = 1;
                p->display = 1;
                count++;
            }

            if (c->end_time == 0)
                c->end_time = last_time;

            c = c->next;
        }
        p = p->next;
    }
    return count;
}

static int determine_display_tasks(u64 threshold)
{
    struct per_pid *p;
    struct per_pidcomm *c;
    int count = 0;

    if (process_filter)
        return determine_display_tasks_filtered();

    p = all_data;
    while (p) {
        p->display = 0;
        if (p->start_time == 1)
            p->start_time = first_time;

        /* no exit marker, task kept running to the end */
        if (p->end_time == 0)
            p->end_time = last_time;
        if (p->total_time >= threshold && !power_only)
            p->display = 1;

        c = p->all;

        while (c) {
            c->display = 0;

            if (c->start_time == 1)
                c->start_time = first_time;

            if (c->total_time >= threshold && !power_only) {
                c->display = 1;
                count++;
            }

            if (c->end_time == 0)
                c->end_time = last_time;

            c = c->next;
        }
        p = p->next;
    }
    return count;
}



#define TIME_THRESH 10000000

static void write_svg_file(const char *filename)
{
    u64 i;
    int count;

    numcpus++;


    count = determine_display_tasks(TIME_THRESH);

    /* We'd like to show at least 15 tasks; be less picky if we have fewer */
    if (count < 15)
        count = determine_display_tasks(TIME_THRESH / 10);

    open_svg(filename, numcpus, count, first_time, last_time);

    svg_time_grid();
    svg_legenda();

    for (i = 0; i < numcpus; i++)
        svg_cpu_box(i, max_freq, turbo_frequency);

    draw_cpu_usage();
    draw_process_bars();
    draw_c_p_states();
    draw_wakeups();

    svg_close();
}

static int __cmd_timechart(const char *input_name, const char *output_name)
{
    struct perf_tool perf_timechart = {
        .comm        = process_comm_event,
        .fork        = process_fork_event,
        .exit        = process_exit_event,
        .sample      = process_sample_event,
        .ordered_samples = true,
    };
    struct perf_session *session = perf_session__new(input_name, O_RDONLY,
                             0, false, &perf_timechart);
    int ret = -EINVAL;

    if (session == NULL)
        return -ENOMEM;

    if (!perf_session__has_traces(session, "timechart record"))
        goto out_delete;

    ret = perf_session__process_events(session, &perf_timechart);
    if (ret)
        goto out_delete;

    end_sample_processing();

    sort_pids();

    write_svg_file(output_name);

    pr_info("Written %2.1f seconds of trace to %s.\n",
        (last_time - first_time) / 1000000000.0, output_name);
out_delete:
    perf_session__delete(session);
    return ret;
}

static int __cmd_record(int argc, const char **argv)
{
#ifdef SUPPORT_OLD_POWER_EVENTS
    const char * const record_old_args[] = {
        "record", "-a", "-R", "-f", "-c", "1",
        "-e", "power:power_start",
        "-e", "power:power_end",
        "-e", "power:power_frequency",
        "-e", "sched:sched_wakeup",
        "-e", "sched:sched_switch",
    };
#endif
    const char * const record_new_args[] = {
        "record", "-a", "-R", "-f", "-c", "1",
        "-e", "power:cpu_frequency",
        "-e", "power:cpu_idle",
        "-e", "sched:sched_wakeup",
        "-e", "sched:sched_switch",
    };
    unsigned int rec_argc, i, j;
    const char **rec_argv;
    const char * const *record_args = record_new_args;
    unsigned int record_elems = ARRAY_SIZE(record_new_args);

#ifdef SUPPORT_OLD_POWER_EVENTS
    if (!is_valid_tracepoint("power:cpu_idle") &&
        is_valid_tracepoint("power:power_start")) {
        use_old_power_events = 1;
        record_args = record_old_args;
        record_elems = ARRAY_SIZE(record_old_args);
    }
#endif

    rec_argc = record_elems + argc - 1;
    rec_argv = calloc(rec_argc + 1, sizeof(char *));

    if (rec_argv == NULL)
        return -ENOMEM;

    for (i = 0; i < record_elems; i++)
        rec_argv[i] = strdup(record_args[i]);

    for (j = 1; j < (unsigned int)argc; j++, i++)
        rec_argv[i] = argv[j];

    return cmd_record(i, rec_argv, NULL);
}

static int
parse_process(const struct option *opt __maybe_unused, const char *arg,
          int __maybe_unused unset)
{
    if (arg)
        add_process_filter(arg);
    return 0;
}

int cmd_timechart(int argc, const char **argv,
          const char *prefix __maybe_unused)
{
    const char *input_name;
    const char *output_name = "output.svg";
    const struct option options[] = {
    OPT_STRING('i', "input", &input_name, "file", "input file name"),
    OPT_STRING('o', "output", &output_name, "file", "output file name"),
    OPT_INTEGER('w', "width", &svg_page_width, "page width"),
    OPT_BOOLEAN('P', "power-only", &power_only, "output power data only"),
    OPT_CALLBACK('p', "process", NULL, "process",
              "process selector. Pass a pid or process name.",
               parse_process),
    OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
            "Look for files with symbols relative to this directory"),
    OPT_END()
    };
    const char * const timechart_usage[] = {
        "perf timechart [<options>] {record}",
        NULL
    };

    argc = parse_options(argc, argv, options, timechart_usage,
            PARSE_OPT_STOP_AT_NON_OPTION);

    symbol__init();

    if (argc && !strncmp(argv[0], "rec", 3))
        return __cmd_record(argc, argv);
    else if (argc)
        usage_with_options(timechart_usage, options);

    setup_pager();

    return __cmd_timechart(input_name, output_name);
}