perf, sched migration: Make it vertically scrollable

With scheduler traces covering more than two cpus, rectangles
of the CPUs 3 and more are not visibles.

This makes the vertical navigation scrollable so that all of the
CPUs rectangles are available.

We also want to be able to zoom vertically, so that we can fit at
best the screen with CPU rectangles, but that's for later.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Nikhil Rao <ncrao@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>

tools/perf/scripts/python/sched-migration.py

@@ -43,18 +43,20 @@ def __init__(self, timeslices, parent = None, id = -1, title = "Migration"):
 		self.timeslices = timeslices
 		(self.ts_start, self.ts_end) = timeslices.interval()
 		self.update_width_virtual()
+		self.nr_cpus = timeslices.max_cpu() + 1
+		self.height_virtual = RootFrame.Y_OFFSET + (self.nr_cpus * (RootFrame.CPU_HEIGHT + RootFrame.CPU_SPACE))
 
 		# whole window panel
 		self.panel = wx.Panel(self, size=(self.screen_width, self.screen_height))
 
 		# scrollable container
 		self.scroll = wx.ScrolledWindow(self.panel)
-		self.scroll.SetScrollbars(self.scroll_scale, self.scroll_scale, self.width_virtual / self.scroll_scale, 100 / 10)
+		self.scroll.SetScrollbars(self.scroll_scale, self.scroll_scale, self.width_virtual / self.scroll_scale, self.height_virtual / self.scroll_scale)
 		self.scroll.EnableScrolling(True, True)
 		self.scroll.SetFocus()
 
 		# scrollable drawing area
-		self.scroll_panel = wx.Panel(self.scroll, size=(self.screen_width, self.screen_height / 2))
+		self.scroll_panel = wx.Panel(self.scroll, size=(self.screen_width - 15, self.screen_height / 2))
 		self.scroll_panel.Bind(wx.EVT_PAINT, self.on_paint)
 		self.scroll_panel.Bind(wx.EVT_KEY_DOWN, self.on_key_press)
 		self.scroll_panel.Bind(wx.EVT_LEFT_DOWN, self.on_mouse_down)
@@ -65,9 +67,8 @@ def __init__(self, timeslices, parent = None, id = -1, title = "Migration"):
 		self.scroll.Fit()
 		self.Fit()
 
-		self.scroll_panel.SetDimensions(-1, -1, self.width_virtual, -1, wx.SIZE_USE_EXISTING)
+		self.scroll_panel.SetDimensions(-1, -1, self.width_virtual, self.height_virtual, wx.SIZE_USE_EXISTING)
 
-		self.max_cpu = -1
 		self.txt = None
 
 		self.Show(True)
@@ -143,8 +144,6 @@ def update_rectangles(self, dc, start, end):
 
 			for cpu in timeslice.rqs:
 				self.update_rectangle_cpu(dc, timeslice, cpu, self.timeslices[0].start)
-				if cpu > self.max_cpu:
-					self.max_cpu = cpu
 
 	def on_paint(self, event):
 		color = wx.Colour(0xff, 0xff, 0xff)
@@ -163,7 +162,7 @@ def cpu_from_ypixel(self, y):
 		cpu = y / (RootFrame.CPU_HEIGHT + RootFrame.CPU_SPACE)
 		height = y % (RootFrame.CPU_HEIGHT + RootFrame.CPU_SPACE)
 
-		if cpu < 0 or cpu > self.max_cpu or height > RootFrame.CPU_HEIGHT:
+		if cpu < 0 or cpu > self.nr_cpus - 1 or height > RootFrame.CPU_HEIGHT:
 			return -1
 
 		return cpu
@@ -206,7 +205,7 @@ def __zoom(self, x):
 		self.update_width_virtual()
 		(xpos, ypos) = self.scroll.GetViewStart()
 		xpos = self.us_to_px(x) / self.scroll_scale
-		self.scroll.SetScrollbars(self.scroll_scale, self.scroll_scale, self.width_virtual / self.scroll_scale, 100 / 10, xpos, ypos)
+		self.scroll.SetScrollbars(self.scroll_scale, self.scroll_scale, self.width_virtual / self.scroll_scale, self.height_virtual / self.scroll_scale, xpos, ypos)
 		self.Refresh()
 
 	def zoom_in(self):
@@ -234,7 +233,11 @@ def on_key_press(self, event):
 		if key == wx.WXK_RIGHT:
 			self.scroll.Scroll(x + 1, y)
 		elif key == wx.WXK_LEFT:
-			self.scroll.Scroll(x -1, y)
+			self.scroll.Scroll(x - 1, y)
+		elif key == wx.WXK_DOWN:
+			self.scroll.Scroll(x, y + 1)
+		elif key == wx.WXK_UP:
+			self.scroll.Scroll(x, y - 1)
 
 
 threads = { 0 : "idle"}
@@ -504,6 +507,14 @@ def interval(self):
 
 		return (self.data[0].start, self.data[-1].end)
 
+	def max_cpu(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):