Version:  2.6.32 2.6.33 2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9

Architecture:  x86 arm avr32 blackfin m68k m68knommu microblaze mips powerpc sh

   /*
    * builtin-timechart.c - make an svg timechart of system activity
    *
    * (C) Copyright 2009 Intel Corporation
    *
    * Authors:
    *     Arjan van de Ven <arjan@linux.intel.com>
    *
    * 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 *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 *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(output_name);
 }
 

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