From 3fc0dde9a90699c6137ecfb9175c36367fcd8f91 Mon Sep 17 00:00:00 2001
From: Peter Wu <peter@lekensteyn.nl>
Date: Wed, 18 Jun 2014 12:31:01 +0200
Subject: interrupts-graph.py: implement read/write to file

---
 rare/interrupts-graph.py | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/rare/interrupts-graph.py b/rare/interrupts-graph.py
index eb4c5c4..c7b824f 100755
--- a/rare/interrupts-graph.py
+++ b/rare/interrupts-graph.py
@@ -13,6 +13,7 @@ from collections import deque, OrderedDict
 import numpy as np
 from scipy.interpolate import spline, interp1d
 import threading
+from argparse import ArgumentParser
 
 # Number of seconds to show in the graph
 XRANGE = 60
@@ -40,6 +41,17 @@ ALT_COLORS = ['#023FA5', '#7D87B9', '#BEC1D4', '#D6BCC0', '#BB7784', '#FFFFFF',
 
 input_filename, output_filename = '', ''
 
+parser = ArgumentParser(description='Monitor /proc/interrupts changes')
+parser.add_argument('-i', dest='input_filename',
+                    help='Source to read interrupts entries from')
+parser.add_argument('-o', dest='output_filename',
+                    help='Target file to write interrupt entries to')
+args = parser.parse_args()
+if args.input_filename:
+    input_filename = args.input_filename
+if args.output_filename:
+    output_filename = args.output_filename
+
 def is_line_ok(name, yvalues):
     """Returns True if a line should be displayed for this name."""
     if max(yvalues) < 5:
@@ -189,9 +201,13 @@ start_time = -XRANGE
 def refresh_data():
     global start_time
     # Update data
+    updated = False
     for name, n in get_diffs():
         yvalues[name].append(n)
-    start_time += INTERVAL
+        updated = True
+    if updated:
+        start_time += INTERVAL
+    return updated
 
 smooth = {}
 @synchronized(data_lock)
@@ -285,11 +301,18 @@ def do_draw():
 update_title()
 
 # Separate worker for fetching data
+t = None
 def refresh_data_timer():
     global t
     t = threading.Timer(INTERVAL, refresh_data_timer)
     t.start()
     refresh_data()
+
+# Fill xrange of entries
+if not input_is_proc:
+    for i in range(0, int(XRANGE / INTERVAL)):
+        if not refresh_data():
+            break
 refresh_data_timer()
 
 while running:
@@ -299,4 +322,5 @@ while running:
     plt.pause(INTERVAL)
 
 # Cancel any scheduled timer
-t.cancel()
+if t:
+    t.cancel()
-- 
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