1 files changed, 1124 insertions, 0 deletions

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
new file mode 100644
index 00000000..3b75b2e2
--- /dev/null
+++ b/tools/perf/builtin-timechart.c
@@ -0,0 +1,1124 @@
+/*
+ * 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 const char	*input_name;
+static const char	*output_name = "output.svg";
+
+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 = malloc(sizeof(struct per_pid));
+	assert(cursor != NULL);
+	memset(cursor, 0, sizeof(struct per_pid));
+	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 = malloc(sizeof(struct per_pidcomm));
+	assert(c != NULL);
+	memset(c, 0, sizeof(struct per_pidcomm));
+	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 = malloc(sizeof(struct per_pidcomm));
+		assert(c != NULL);
+		memset(c, 0, sizeof(struct per_pidcomm));
+		p->current = c;
+		c->next = p->all;
+		p->all = c;
+	}
+
+	sample = malloc(sizeof(struct cpu_sample));
+	assert(sample != NULL);
+	memset(sample, 0, sizeof(struct cpu_sample));
+	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 __used,
+			      union perf_event *event,
+			      struct perf_sample *sample __used,
+			      struct machine *machine __used)
+{
+	pid_set_comm(event->comm.tid, event->comm.comm);
+	return 0;
+}
+
+static int process_fork_event(struct perf_tool *tool __used,
+			      union perf_event *event,
+			      struct perf_sample *sample __used,
+			      struct machine *machine __used)
+{
+	pid_fork(event->fork.pid, event->fork.ppid, event->fork.time);
+	return 0;
+}
+
+static int process_exit_event(struct perf_tool *tool __used,
+			      union perf_event *event,
+			      struct perf_sample *sample __used,
+			      struct machine *machine __used)
+{
+	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;
+	pwr = malloc(sizeof(struct power_event));
+	if (!pwr)
+		return;
+	memset(pwr, 0, sizeof(struct power_event));
+
+	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;
+	pwr = malloc(sizeof(struct power_event));
+
+	if (new_freq > 8000000) /* detect invalid data */
+		return;
+
+	if (!pwr)
+		return;
+	memset(pwr, 0, sizeof(struct power_event));
+
+	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 wake_event *we;
+	struct per_pid *p;
+	struct wakeup_entry *wake = (void *)te;
+
+	we = malloc(sizeof(struct wake_event));
+	if (!we)
+		return;
+
+	memset(we, 0, sizeof(struct wake_event));
+	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 __used,
+				union perf_event *event __used,
+				struct perf_sample *sample,
+				struct perf_evsel *evsel,
+				struct machine *machine __used)
+{
+	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++) {
+		pwr = malloc(sizeof(struct power_event));
+		if (!pwr)
+			return;
+		memset(pwr, 0, sizeof(struct power_event));
+
+		/* C state */
+#if 0
+		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 = malloc(sizeof(struct power_event));
+		if (!pwr)
+			return;
+		memset(pwr, 0, sizeof(struct power_event));
+
+		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)
+{
+	struct process_filter *filt;
+	int pid;
+
+	pid = strtoull(string, NULL, 10);
+	filt = malloc(sizeof(struct process_filter));
+	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 struct perf_tool perf_timechart = {
+	.comm			= process_comm_event,
+	.fork			= process_fork_event,
+	.exit			= process_exit_event,
+	.sample			= process_sample_event,
+	.ordered_samples	= true,
+};
+
+static int __cmd_timechart(void)
+{
+	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 const char * const timechart_usage[] = {
+	"perf timechart [<options>] {record}",
+	NULL
+};
+
+#ifdef SUPPORT_OLD_POWER_EVENTS
+static 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
+
+static 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",
+};
+
+static int __cmd_record(int argc, const char **argv)
+{
+	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 __used, const char *arg, int __used unset)
+{
+	if (arg)
+		add_process_filter(arg);
+	return 0;
+}
+
+static 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()
+};
+
+
+int cmd_timechart(int argc, const char **argv, const char *prefix __used)
+{
+	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();
+}