From 9d888e794ad8ca67275e56e1f9fc6a7fba68e8ff Mon Sep 17 00:00:00 2001
From: Alexey Avramov <hakavlad@gmail.com>
Date: Thu, 12 Jul 2018 03:21:53 +0900
Subject: [PATCH] print reaction time if victim got signal

---
 README.md   | 28 +++++++++++++++++++++++-----
 nohang      |  9 ++++++++-
 nohang.conf |  4 ++--
 3 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index 57c34f9..2d37e5a 100644
--- a/README.md
+++ b/README.md
@@ -32,11 +32,29 @@ OOM killer doesn't prevent OOM conditions.
 ### An example of output
 
 ```
-  MemAvailable (0 MiB, 0.0 %) < mem_min_sigterm (588 MiB, 10.0 %)
-  SwapFree (943 MiB, 8.8 %) < swap_min_sigterm (1076 MiB, 10.0 %)
-  Preventing OOM: trying to send the SIGTERM signal to tail,
-  Pid: 14636, Badness: 777, VmRSS: 4446 MiB, VmSwap: 8510 MiB
-  Success
+MemAvail: 2515 M, 42.8 %
+MemAvail: 1510 M, 25.7 %
+MemAvail:  909 M, 15.5 %
+MemAvail:  520 M,  8.9 %
+* MemAvailable (520 MiB, 8.9 %) < mem_min_sigterm (529 MiB, 9.0 %)
+  SwapFree (0 MiB, 0.0 %) < swap_min_sigterm (0 MiB, - %)
+  Preventing OOM: trying to send the SIGTERM signal to stress,
+  Pid: 9828, Badness: 82, VmRSS: 485 MiB, VmSwap: 0 MiB
+  Success; reaction time: 11 ms
+MemAvail: 4114 M, 70.0 %
+MemAvail: 2532 M, 43.1 %
+MemAvail: 1495 M, 25.4 %
+MemAvail:  927 M, 15.8 %
+MemAvail:  553 M,  9.4 %
+MemAvail:  342 M,  5.8 %
+* MemAvailable (342 MiB, 5.8 %) < mem_min_sigkill (353 MiB, 6.0 %)
+  SwapFree (0 MiB, 0.0 %) < swap_min_sigkill (0 MiB, - %)
+  Preventing OOM: trying to send the SIGKILL signal to stress,
+  Pid: 9841, Badness: 87, VmRSS: 513 MiB, VmSwap: 0 MiB
+  Success; reaction time: 11 ms
+MemAvail: 4084 M, 69.5 %
+MemAvail: 2543 M, 43.3 %
+MemAvail: 1535 M, 26.1 %
 ```
 
 ### Requirements
diff --git a/nohang b/nohang
index 5e0fa40..ecb1dc2 100755
--- a/nohang
+++ b/nohang
@@ -229,6 +229,8 @@ def sleep_after_send_signal(signal):
 
 def find_victim_and_send_signal(signal):
 
+    time0 = time()
+
     print(mem_info)
 
     # выставляем потолок для oom_score_adj всех процессов
@@ -326,7 +328,9 @@ def find_victim_and_send_signal(signal):
 
             try:
                 os.kill(int(pid), signal)
-                send_result = '  Success'
+                success_time = time()
+                delta_success = success_time - time0
+                send_result = '  Success; reaction time: {} ms'.format(round(delta_success * 1000))
 
                 if desktop_notifications:
                     send_notify(signal, name, pid, oom_score, vm_rss, vm_swap)
@@ -1247,6 +1251,7 @@ while True:
                 break
 
 
+
     # если swap_min_sigkill задан в процентах
     if swap_kill_is_percent:
         swap_min_sigkill_kb = swap_total * swap_min_sigkill_percent / 100.0
@@ -1396,8 +1401,10 @@ while True:
                 warn_timer = 0
         sleep_after_check_mem()
 
+
     # SLEEP BETWEEN MEM CHECKS
     else:
+
         sleep_after_check_mem()
 
 
diff --git a/nohang.conf b/nohang.conf
index 3ccd46e..50abe46 100644
--- a/nohang.conf
+++ b/nohang.conf
@@ -68,8 +68,8 @@ zram_max_sigkill = 60 %
 
     Valid values are positive floating-point numbers.
 
-rate_mem = 4
-rate_swap = 2
+rate_mem = 6
+rate_swap = 3
 rate_zram = 1
 
 #####################################################################