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Added the ability to log into a separate file

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This commit is contained in:
Alexey Avramov 2019-03-18 13:21:10 +09:00
parent 6e7eea2da7
commit 71dcb30cfb
3 changed files with 66 additions and 49 deletions
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15
README.md
View File

@ -51,8 +51,8 @@ The tools listed above may work at the same time on one computer.
- Notification of corrective actions taken and displaying the name and PID of the victim
- Low memory warnings (displays available memory)
- `zram` support (`mem_used_total` as a trigger)
- Initial [PSI](https://lwn.net/Articles/759658/) support (since Linux 4.20+, using `/proc/pressure/memory` and `some avg10` as a trigger)
- Convenient configuration with a ~~well~~ commented [config file](https://github.com/hakavlad/nohang/blob/master/nohang.conf)
- Initial [PSI](https://lwn.net/Articles/759658/) support
- Easy configuration with a ~~well~~ commented [config file](https://github.com/hakavlad/nohang/blob/master/nohang.conf)
## Requirements
@ -186,15 +186,7 @@ See also `man journalctl`.
## Known problems
- Awful documentation (the problem will be solved gradually in the next releases)
- It is written in Python and is actually a prototype (although the algorithm may be good)
- No tests (by itself this does not make the algorithm bad)
## Todo
- Make installer for non-systemd users
- Deb/rpm packaging
- Rewrite all code in Golang with tests and good documentation.
- Awful documentation.
## Nohang don't help you
@ -218,6 +210,7 @@ Please create [issues](https://github.com/hakavlad/nohang/issues). Use cases, fe
- [x] Add delta memory info (the rate of change of available memory)
- [x] Print statistics on corrective actions after each corrective action
- [x] Added ability to print a process table before each corrective action
- [x] Added the ability to log into a separate file
- [x] Improve poll rate algorithm
- [x] Add `max_post_sigterm_victim_lifetime` option: send SIGKILL to the victim if it doesn't respond to SIGTERM for a certain time
- [x] Improve victim search algorithm (do it ~30% faster) ([rfjakob/earlyoom#114](https://github.com/rfjakob/earlyoom/issues/114))

86
nohang
View File

@ -9,6 +9,36 @@ from sys import stdout, stderr, argv, exit
from signal import SIGKILL, SIGTERM
import sys
import logging
from logging import basicConfig
from logging import info
logfile = '/var/log/nohang/nohang.log'
basicConfig(filename=logfile,
level=logging.INFO,
format="%(asctime)s: %(message)s")
separate_log = True
def log(msg):
print(msg)
if separate_log:
info(msg)
start_time = time()
@ -43,7 +73,6 @@ wait_time = 10
notify_helper_path = '/usr/sbin/nohang_notify_helper'
HR = ''
victim_dict = dict()
@ -203,8 +232,8 @@ def update_stat_dict_and_print(key):
if print_total_stat:
stats_msg = '{}\nTotal stat (what happened in the last {}):'.format(
HR, format_time(time() - start_time))
stats_msg = 'Total stat (what happened in the last {}):'.format(
format_time(time() - start_time))
for i in stat_dict:
stats_msg += '\n {}: {}'.format(i, stat_dict[i])
@ -775,9 +804,9 @@ def find_victim():
pid_badness_list = []
if print_proc_table:
print('===============================================================================')
print(' PID badness Name eUID cmdline')
print('------- ------- --------------- ---------- ---------------------------------')
log('===============================================================================')
log(' PID badness Name eUID cmdline')
log('------- ------- --------------- ---------- ---------------------------------')
for pid in pid_list:
@ -786,7 +815,7 @@ def find_victim():
continue
if print_proc_table:
print('{} {} {} {} {}'.format(
log('{} {} {} {} {}'.format(
pid.rjust(7),
str(badness).rjust(7),
pid_to_name(pid).ljust(15),
@ -813,10 +842,10 @@ def find_victim():
victim_name = pid_to_name(pid)
if print_proc_table:
print('===============================================================================')
log('===============================================================================')
print(
'\nProcess with highest badness (found in {} ms):\n PID: {}, Name: {}, badness: {}'.format(
log(
'Process with highest badness (found in {} ms):\n PID: {}, Name: {}, badness: {}'.format(
round((time() - ft1) * 1000),
pid,
victim_name,
@ -987,7 +1016,7 @@ def find_victim_info(pid, victim_badness, name):
victim_lifetime = format_time(uptime() - pid_to_starttime(pid))
victim_info = '\nVictim information (found in {} ms):' \
victim_info = 'Victim information (found in {} ms):' \
'\n Name: {}' \
'\n State: {}' \
'\n PID: {}' \
@ -1027,7 +1056,7 @@ def implement_corrective_action(signal):
Find victim with highest badness and send SIGTERM/SIGKILL
"""
print(mem_info)
log(mem_info)
pid, victim_badness, name = find_victim()
@ -1035,7 +1064,7 @@ def implement_corrective_action(signal):
if print_victim_info:
victim_info = find_victim_info(pid, victim_badness, name)
print(victim_info)
log(victim_info)
# kill the victim if it doesn't respond to SIGTERM
if signal is SIGTERM:
@ -1059,7 +1088,7 @@ def implement_corrective_action(signal):
m = check_mem_and_swap()
ma = round(int(m[0]) / 1024.0)
sf = round(int(m[2]) / 1024.0)
print('\nMemory status before implementing a corrective action:\n MemAvailable'
log('Memory status before implementing a corrective action:\n MemAvailable'
': {} MiB, SwapFree: {} MiB'.format(ma, sf))
exit_status = os.system(etc_dict[name].replace(
@ -1072,7 +1101,7 @@ def implement_corrective_action(signal):
response_time = time() - time0
etc_info = '\nImplement a corrective action:\n Run the command: {}' \
etc_info = 'Implement a corrective action:\n Run the command: {}' \
'\n Exit status: {}; total response time: {} ms'.format(
command.replace(
'$PID', pid).replace(
@ -1098,7 +1127,7 @@ def implement_corrective_action(signal):
m = check_mem_and_swap()
ma = round(int(m[0]) / 1024.0)
sf = round(int(m[2]) / 1024.0)
print('\nMemory status before implementing a corrective action:\n MemAvailable'
log('Memory status before implementing a corrective action:\n MemAvailable'
': {} MiB, SwapFree: {} MiB'.format(ma, sf))
os.kill(int(pid), signal)
@ -1106,7 +1135,7 @@ def implement_corrective_action(signal):
send_result = 'total response time: {} ms'.format(
round(response_time * 1000))
preventing_oom_message = '\nImplement a corrective action:' \
preventing_oom_message = 'Implement a corrective action:' \
'\n Send {} to the victim; {}'.format(
sig_dict[signal], send_result)
@ -1135,7 +1164,7 @@ def implement_corrective_action(signal):
round(response_time * 1000))
key = 'ProcessLookupError (the victim died in the search process): '
print(preventing_oom_message)
log(preventing_oom_message)
update_stat_dict_and_print(key)
@ -1154,7 +1183,6 @@ def implement_corrective_action(signal):
key = 'victim badness < min_badness'
update_stat_dict_and_print(key)
print('###############################################################################')
sleep_after_send_signal(signal)
@ -1987,18 +2015,18 @@ while True:
avg10 = find_psi_metrics_value(psi_path, psi_metrics)
if print_mem_check_results:
avg_value = 'PSI value: {} | '.format(str(avg10).rjust(6))
avg_value = 'PSI avg value: {} | '.format(str(avg10).rjust(6))
if avg10 >= sigkill_psi and time() - psi_t0 >= psi_avg10_sleep_time:
time0 = time()
mem_info = 'PSI value ({}) > sigkill_psi ({})'.format(avg10, sigkill_psi)
mem_info = 'PSI avg value ({}) > sigkill_psi ({})'.format(avg10, sigkill_psi)
implement_corrective_action(SIGKILL)
psi_t0 = time()
continue
if avg10 >= sigterm_psi and time() - psi_t0 >= psi_avg10_sleep_time:
time0 = time()
mem_info = 'PSI value ({}) > sigterm_psi ({})'.format(avg10, sigterm_psi)
mem_info = 'PSI avg value ({}) > sigterm_psi ({})'.format(avg10, sigterm_psi)
implement_corrective_action(SIGTERM)
psi_t0 = time()
continue
@ -2058,7 +2086,7 @@ while True:
# Output avialable mem sizes
if swap_total == 0 and mem_used_zram == 0:
print('{}MemAvail: {} M, {} %{}'.format(
log('{}MemAvail: {} M, {} %{}'.format(
avg_value,
human(mem_available, mem_len),
just_percent_mem(mem_available / mem_total),
@ -2113,11 +2141,10 @@ while True:
swap_free <= swap_min_sigkill_kb):
time0 = time()
mem_info = '{}\nSIGKILL threshold exeeded\nMemory status that requires corrective actions:' \
mem_info = 'Hard threshold exeeded\nMemory status that requires corrective actions:' \
'\n MemAvailable [{} MiB, {} %] <= mem_min_sig' \
'kill [{} MiB, {} %]\n SwapFree [{} MiB, {} %] <= swa' \
'p_min_sigkill [{} MiB, {} %]'.format(
HR,
kib_to_mib(mem_available),
percent(mem_available / mem_total),
kib_to_mib(mem_min_sigkill_kb),
@ -2135,10 +2162,9 @@ while True:
if mem_used_zram >= zram_max_sigkill_kb:
time0 = time()
mem_info = '{}\nSIGKILL threshold exeeded\nMemory status that requires corrective actions:' \
mem_info = 'Hard threshold exeeded\nMemory status that requires corrective actions:' \
'\n MemUsedZram [{} MiB, {} %] >= zram_max_sig' \
'kill [{} MiB, {} %]'.format(
HR,
kib_to_mib(mem_used_zram),
percent(mem_used_zram / mem_total),
kib_to_mib(zram_max_sigkill_kb),
@ -2154,11 +2180,10 @@ while True:
time0 = time()
mem_info = '{}\nSIGTERM threshold exeeded\nMemory status that requires corrective actions:' \
mem_info = 'Soft threshold exeeded\nMemory status that requires corrective actions:' \
'\n MemAvailable [{} MiB, {} %] <= mem_min_sig' \
'term [{} MiB, {} %]\n SwapFree [{} MiB, {} %] <= swa' \
'p_min_sigterm [{} MiB, {} %]'.format(
HR,
kib_to_mib(mem_available),
percent(mem_available / mem_total),
kib_to_mib(mem_min_sigterm_kb),
@ -2178,10 +2203,9 @@ while True:
if mem_used_zram >= zram_max_sigterm_kb:
time0 = time()
mem_info = '{}\nSIGTERM threshold exeeded\nMemory status that requires corrective actions:' \
mem_info = 'Soft threshold exeeded\nMemory status that requires corrective actions:' \
'\n MemUsedZram [{} MiB, {} %] >= ' \
'zram_max_sigterm [{} M, {} %]'.format(
HR,
kib_to_mib(mem_used_zram),
percent(mem_used_zram / mem_total),
kib_to_mib(zram_max_sigterm_kb),

14
nohang.conf
View File

@ -65,16 +65,16 @@ zram_max_sigkill = 55 %
Response on PSI memory some/full avg10/avg60/avg300 value
(/proc/pressure/memory on systems with Linux 4.20+).
ignore_psi = False
ignore_psi = True
Choose path to PSI file.
psi_path = /sys/fs/cgroup/unified/user.slice/memory.pressure
psi_path = /sys/fs/cgroup/unified/system.slice/memory.pressure
psi_path = /sys/fs/cgroup/unified/system.slice/foo.service/memory.pressure
psi_path = /proc/pressure/memory
psi_path = ./psi_dummy
psi_path = ./psi_dummy
psi_path = /proc/pressure/memory
psi_metrics = some_avg10
@ -323,7 +323,7 @@ zram_max_warnings = 40 %
#####################################################################
7. Output verbosity
7. Verbosity
Display the configuration when the program starts.
Valid values are True and False.
@ -333,13 +333,13 @@ print_config = False
Print memory check results.
Valid values are True and False.
print_mem_check_results = True
print_mem_check_results = False
Минимальная периодичность печати состояния памяти.
0 - печатать все проверки памяти.
Неотрицательное число.
min_mem_report_interval = 1
min_mem_report_interval = 10
Print sleep periods between memory checks.
Valid values are True and False.
@ -372,7 +372,7 @@ max_ancestry_depth = 3
которого жертва получит SIGKILL.
Неотрицательные числа.
max_post_sigterm_victim_lifetime = 9
max_post_sigterm_victim_lifetime = 10
Выполнить произвольную команду после SIGKILL.
Пустая строка - ничего не выполнять.