#!/usr/bin/python
#
# Cpu task migration overview toy
#
# Copyright (C) 2010 Frederic Weisbecker <fweisbec@gmail.com>
#
# perf script event handlers have been generated by perf script -g python
#
# This software is distributed under the terms of the GNU General
# Public License ("GPL") version 2 as published by the Free Software
# Foundation.
from __future__ import print_function

import os
import sys

from collections import defaultdict
try:
    from UserList import UserList
except ImportError:
    # Python 3: UserList moved to the collections package
    from collections import UserList

sys.path.append(os.environ['PERF_EXEC_PATH'] + \
	'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
sys.path.append('scripts/python/Perf-Trace-Util/lib/Perf/Trace')

from perf_trace_context import *
from Core import *
from SchedGui import *


threads = { 0 : "idle"}

def thread_name(pid):
	return "%s:%d" % (threads[pid], pid)

class RunqueueEventUnknown:
	@staticmethod
	def color():
		return None

	def __repr__(self):
		return "unknown"

class RunqueueEventSleep:
	@staticmethod
	def color():
		return (0, 0, 0xff)

	def __init__(self, sleeper):
		self.sleeper = sleeper

	def __repr__(self):
		return "%s gone to sleep" % thread_name(self.sleeper)

class RunqueueEventWakeup:
	@staticmethod
	def color():
		return (0xff, 0xff, 0)

	def __init__(self, wakee):
		self.wakee = wakee

	def __repr__(self):
		return "%s woke up" % thread_name(self.wakee)

class RunqueueEventFork:
	@staticmethod
	def color():
		return (0, 0xff, 0)

	def __init__(self, child):
		self.child = child

	def __repr__(self):
		return "new forked task %s" % thread_name(self.child)

class RunqueueMigrateIn:
	@staticmethod
	def color():
		return (0, 0xf0, 0xff)

	def __init__(self, new):
		self.new = new

	def __repr__(self):
		return "task migrated in %s" % thread_name(self.new)

class RunqueueMigrateOut:
	@staticmethod
	def color():
		return (0xff, 0, 0xff)

	def __init__(self, old):
		self.old = old

	def __repr__(self):
		return "task migrated out %s" % thread_name(self.old)

class RunqueueSnapshot:
	def __init__(self, tasks = [0], event = RunqueueEventUnknown()):
		self.tasks = tuple(tasks)
		self.event = event

	def sched_switch(self, prev, prev_state, next):
		event = RunqueueEventUnknown()

		if taskState(prev_state) == "R" and next in self.tasks \
			and prev in self.tasks:
			return self

		if taskState(prev_state) != "R":
			event = RunqueueEventSleep(prev)

		next_tasks = list(self.tasks[:])
		if prev in self.tasks:
			if taskState(prev_state) != "R":
				next_tasks.remove(prev)
		elif taskState(prev_state) == "R":
			next_tasks.append(prev)

		if next not in next_tasks:
			next_tasks.append(next)

		return RunqueueSnapshot(next_tasks, event)

	def migrate_out(self, old):
		if old not in self.tasks:
			return self
		next_tasks = [task for task in self.tasks if task != old]

		return RunqueueSnapshot(next_tasks, RunqueueMigrateOut(old))

	def __migrate_in(self, new, event):
		if new in self.tasks:
			self.event = event
			return self
		next_tasks = self.tasks[:] + tuple([new])

		return RunqueueSnapshot(next_tasks, event)

	def migrate_in(self, new):
		return self.__migrate_in(new, RunqueueMigrateIn(new))

	def wake_up(self, new):
		return self.__migrate_in(new, RunqueueEventWakeup(new))

	def wake_up_new(self, new):
		return self.__migrate_in(new, RunqueueEventFork(new))

	def load(self):
		""" Provide the number of tasks on the runqueue.
		    Don't count idle"""
		return len(self.tasks) - 1

	def __repr__(self):
		ret = self.tasks.__repr__()
		ret += self.origin_tostring()

		return ret

class TimeSlice:
	def __init__(self, start, prev):
		self.start = start
		self.prev = prev
		self.end = start
		# cpus that triggered the event
		self.event_cpus = []
		if prev is not None:
			self.total_load = prev.total_load
			self.rqs = prev.rqs.copy()
		else:
			self.rqs = defaultdict(RunqueueSnapshot)
			self.total_load = 0

	def __update_total_load(self, old_rq, new_rq):
		diff = new_rq.load() - old_rq.load()
		self.total_load += diff

	def sched_switch(self, ts_list, prev, prev_state, next, cpu):
		old_rq = self.prev.rqs[cpu]
		new_rq = old_rq.sched_switch(prev, prev_state, next)

		if old_rq is new_rq:
			return

		self.rqs[cpu] = new_rq
		self.__update_total_load(old_rq, new_rq)
		ts_list.append(self)
		self.event_cpus = [cpu]

	def migrate(self, ts_list, new, old_cpu, new_cpu):
		if old_cpu == new_cpu:
			return
		old_rq = self.prev.rqs[old_cpu]
		out_rq = old_rq.migrate_out(new)
		self.rqs[old_cpu] = out_rq
		self.__update_total_load(old_rq, out_rq)

		new_rq = self.prev.rqs[new_cpu]
		in_rq = new_rq.migrate_in(new)
		self.rqs[new_cpu] = in_rq
		self.__update_total_load(new_rq, in_rq)

		ts_list.append(self)

		if old_rq is not out_rq:
			self.event_cpus.append(old_cpu)
		self.event_cpus.append(new_cpu)

	def wake_up(self, ts_list, pid, cpu, fork):
		old_rq = self.prev.rqs[cpu]
		if fork:
			new_rq = old_rq.wake_up_new(pid)
		else:
			new_rq = old_rq.wake_up(pid)

		if new_rq is old_rq:
			return
		self.rqs[cpu] = new_rq
		self.__update_total_load(old_rq, new_rq)
		ts_list.append(self)
		self.event_cpus = [cpu]

	def next(self, t):
		self.end = t
		return TimeSlice(t, self)

class TimeSliceList(UserList):
	def __init__(self, arg = []):
		self.data = arg

	def get_time_slice(self, ts):
		if len(self.data) == 0:
			slice = TimeSlice(ts, TimeSlice(-1, None))
		else:
			slice = self.data[-1].next(ts)
		return slice

	def find_time_slice(self, ts):
		start = 0
		end = len(self.data)
		found = -1
		searching = True
		while searching:
			if start == end or start == end - 1:
				searching = False

			i = (end + start) / 2
			if self.data[i].start <= ts and self.data[i].end >= ts:
				found = i
				end = i
				continue

			if self.data[i].end < ts:
				start = i

			elif self.data[i].start > ts:
				end = i

		return found

	def set_root_win(self, win):
		self.root_win = win

	def mouse_down(self, cpu, t):
		idx = self.find_time_slice(t)
		if idx == -1:
			return

		ts = self[idx]
		rq = ts.rqs[cpu]
		raw = "CPU: %d\n" % cpu
		raw += "Last event : %s\n" % rq.event.__repr__()
		raw += "Timestamp : %d.%06d\n" % (ts.start / (10 ** 9), (ts.start % (10 ** 9)) / 1000)
		raw += "Duration : %6d us\n" % ((ts.end - ts.start) / (10 ** 6))
		raw += "Load = %d\n" % rq.load()
		for t in rq.tasks:
			raw += "%s \n" % thread_name(t)

		self.root_win.update_summary(raw)

	def update_rectangle_cpu(self, slice, cpu):
		rq = slice.rqs[cpu]

		if slice.total_load != 0:
			load_rate = rq.load() / float(slice.total_load)
		else:
			load_rate = 0

		red_power = int(0xff - (0xff * load_rate))
		color = (0xff, red_power, red_power)

		top_color = None

		if cpu in slice.event_cpus:
			top_color = rq.event.color()

		self.root_win.paint_rectangle_zone(cpu, color, top_color, slice.start, slice.end)

	def fill_zone(self, start, end):
		i = self.find_time_slice(start)
		if i == -1:
			return

		for i in range(i, len(self.data)):
			timeslice = self.data[i]
			if timeslice.start > end:
				return

			for cpu in timeslice.rqs:
				self.update_rectangle_cpu(timeslice, cpu)

	def interval(self):
		if len(self.data) == 0:
			return (0, 0)

		return (self.data[0].start, self.data[-1].end)

	def nr_rectangles(self):
		last_ts = self.data[-1]
		max_cpu = 0
		for cpu in last_ts.rqs:
			if cpu > max_cpu:
				max_cpu = cpu
		return max_cpu


class SchedEventProxy:
	def __init__(self):
		self.current_tsk = defaultdict(lambda : -1)
		self.timeslices = TimeSliceList()

	def sched_switch(self, headers, prev_comm, prev_pid, prev_prio, prev_state,
			 next_comm, next_pid, next_prio):
		""" Ensure the task we sched out this cpu is really the one
		    we logged. Otherwise we may have missed traces """

		on_cpu_task = self.current_tsk[headers.cpu]

		if on_cpu_task != -1 and on_cpu_task != prev_pid:
			print("Sched switch event rejected ts: %s cpu: %d prev: %s(%d) next: %s(%d)" % \
				headers.ts_format(), headers.cpu, prev_comm, prev_pid, next_comm, next_pid)

		threads[prev_pid] = prev_comm
		threads[next_pid] = next_comm
		self.current_tsk[headers.cpu] = next_pid

		ts = self.timeslices.get_time_slice(headers.ts())
		ts.sched_switch(self.timeslices, prev_pid, prev_state, next_pid, headers.cpu)

	def migrate(self, headers, pid, prio, orig_cpu, dest_cpu):
		ts = self.timeslices.get_time_slice(headers.ts())
		ts.migrate(self.timeslices, pid, orig_cpu, dest_cpu)

	def wake_up(self, headers, comm, pid, success, target_cpu, fork):
		if success == 0:
			return
		ts = self.timeslices.get_time_slice(headers.ts())
		ts.wake_up(self.timeslices, pid, target_cpu, fork)


def trace_begin():
	global parser
	parser = SchedEventProxy()

def trace_end():
	app = wx.App(False)
	timeslices = parser.timeslices
	frame = RootFrame(timeslices, "Migration")
	app.MainLoop()

def sched__sched_stat_runtime(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, runtime, vruntime):
	pass

def sched__sched_stat_iowait(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, delay):
	pass

def sched__sched_stat_sleep(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, delay):
	pass

def sched__sched_stat_wait(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, delay):
	pass

def sched__sched_process_fork(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, parent_comm, parent_pid, child_comm, child_pid):
	pass

def sched__sched_process_wait(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, prio):
	pass

def sched__sched_process_exit(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, prio):
	pass

def sched__sched_process_free(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, prio):
	pass

def sched__sched_migrate_task(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, prio, orig_cpu,
	dest_cpu):
	headers = EventHeaders(common_cpu, common_secs, common_nsecs,
				common_pid, common_comm, common_callchain)
	parser.migrate(headers, pid, prio, orig_cpu, dest_cpu)

def sched__sched_switch(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm, common_callchain,
	prev_comm, prev_pid, prev_prio, prev_state,
	next_comm, next_pid, next_prio):

	headers = EventHeaders(common_cpu, common_secs, common_nsecs,
				common_pid, common_comm, common_callchain)
	parser.sched_switch(headers, prev_comm, prev_pid, prev_prio, prev_state,
			 next_comm, next_pid, next_prio)

def sched__sched_wakeup_new(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, prio, success,
	target_cpu):
	headers = EventHeaders(common_cpu, common_secs, common_nsecs,
				common_pid, common_comm, common_callchain)
	parser.wake_up(headers, comm, pid, success, target_cpu, 1)

def sched__sched_wakeup(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, prio, success,
	target_cpu):
	headers = EventHeaders(common_cpu, common_secs, common_nsecs,
				common_pid, common_comm, common_callchain)
	parser.wake_up(headers, comm, pid, success, target_cpu, 0)

def sched__sched_wait_task(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid, prio):
	pass

def sched__sched_kthread_stop_ret(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, ret):
	pass

def sched__sched_kthread_stop(event_name, context, common_cpu,
	common_secs, common_nsecs, common_pid, common_comm,
	common_callchain, comm, pid):
	pass

def trace_unhandled(event_name, context, event_fields_dict):
	pass