scripts: Add throttle.py

Parses a trace.dat and works out how long each throttle was and how many
batches retired within that period (and their average duration).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

Makefile.am

@@ -21,4 +21,4 @@
 
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
-SUBDIRS = lib man tests tools benchmarks
+SUBDIRS = lib man tools scripts tests benchmarks

configure.ac

@@ -95,6 +95,7 @@ AC_CONFIG_FILES([
 	benchmarks/Makefile
 	lib/Makefile
 	man/Makefile
+	scripts/Makefile
 	tests/Makefile
 	tools/Makefile
 ])

scripts/Makefile.am

@@ -0,0 +1,3 @@
+noinst_SCRIPTS = \
+	throttle.py\
+	$(NULL)

scripts/throttle.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+#
+# Usage:
+#  scripts/throttle.py trace-dat
+#
+# Shows how often the trace throttles and for how long.
+
+import getopt
+from tracecmd import *
+import sys
+
+requests = {}
+throttle = {}
+prev_throttle = 0;
+
+def read_events(t):
+	for cpu in range(0, t.cpus):
+		e = t.read_event(cpu)
+		while e:
+			if e.name == 'i915_gem_request_complete':
+				seqno = e.num_field('seqno')
+				requests[seqno] = e.ts;
+
+			if e.name == 'i915_gem_request_throttle_begin':
+				seqno = e.num_field('seqno')
+				throttle[seqno] = e.ts
+
+			if e.name == 'i915_gem_request_throttle_end':
+				global prev_throttle
+
+				ts = 0
+				sum_dispatch = 0
+				num_dispatch = 0
+				max_dispatch = 0
+
+				seqno = e.num_field('seqno')
+				s = prev_throttle
+				if s == 0:
+					s = seqno
+				while s <= seqno:
+					if requests.has_key(s):
+						if ts:
+							delta = requests[s] - ts
+							num_dispatch += 1
+							sum_dispatch += delta
+							if delta > max_dispatch:								max_dispatch = delta
+						ts = requests[s]
+					s += 1
+					
+				if throttle.has_key(seqno) and throttle.has_key(prev_throttle) and num_dispatch:
+					print "throttle +%d: %dms -- %d dispatch, avg %.3fms, max %dus" % ((throttle[seqno]-throttle[prev_throttle])/1000000, (e.ts - throttle[seqno]) / 1000000, num_dispatch, sum_dispatch / (1000000. * num_dispatch), max_dispatch / 1000)
+					throttle[seqno] = e.ts
+
+				prev_throttle = seqno
+
+			e = t.read_event(cpu)
+
+if __name__ == "__main__":
+    	if len(sys.argv) >=2:
+       		filename = sys.argv[1]
+	else:
+		filename = "trace.dat"
+
+	print "Initializing trace '%s'..." % (filename)
+	trace = Trace(filename)
+	read_events(trace)
+