add psi-trigger

trash/psi-trigger

@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+
+from time import sleep, time
+
+t0 = time()
+
+hog_list = []
+
+duration = 60
+
+sff_max = 0.55
+sff_min = 0.45
+
+mb = 1024 * 1024
+path = '/dev/zero'
+
+def sff():
+    """
+    SwapFree fraction
+    """
+    with open('/proc/meminfo') as f:
+        for i in f:
+            if i.startswith('SwapTotal'):
+                st = i.split(':')[1].strip(' kB\n')
+            if i.startswith('SwapFree'):
+                sf = i.split(':')[1].strip(' kB\n')
+                st = float(st) + 1
+                sf = float(sf)
+                return sf / st
+
+
+def hog(hog_list):
+    """
+    """
+    with open(path, 'rb') as f:
+        raw = f.read(mb)
+        hog_list.append(raw)
+
+    return hog_list
+
+
+while True:
+
+    while sff() > sff_min:
+        hog_list.reverse()
+        if time() - t0 > duration:
+            exit()
+        hog_list = hog(hog_list)
+        print('MiB:', len(hog_list), 'SwapFree:', sff(), 'time:', time() - t0)
+
+    while sff() < sff_max:
+        hog_list.reverse()
+        if time() - t0 > duration:
+            exit()
+        try:
+            hog_list.pop()
+        except IndexError:
+            break
+        print('MiB:', len(hog_list), 'SwapFree:', sff(), 'time:', time() - t0)
+