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Improve customizing soft corrective actions: add @SOFT_ACTION_RE_CGROUP_V2

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This commit is contained in:
Alexey Avramov 2020-03-29 18:03:08 +09:00
parent e94ac4cf02
commit 1b24be5359
3 changed files with 44 additions and 29 deletions
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47
nohang/nohang
View File

@ -597,12 +597,12 @@ def check_config():
else:
log(' (not set)')
log('\n8. Customize corrective actions')
log('\n8. Customize soft corrective actions')
if len(soft_actions_list) > 0:
log(' Match by: regexp: command: ')
log(' Match by: regexp: command: ')
for i in soft_actions_list:
log(' {} {} {}'.format(i[0], i[1], i[2]))
log(' {} {} {}'.format(i[0].ljust(10), i[1].ljust(12), i[2]))
else:
log(' (not set)')
@ -2295,19 +2295,25 @@ def implement_corrective_action(
if soft_actions and threshold is SIGTERM:
name = pid_to_name(pid)
cgroup_v1 = pid_to_cgroup_v1(pid)
service = ''
cgroup_v1_tail = cgroup_v1.rpartition('/')[2]
if cgroup_v1_tail.endswith('.service'):
service = cgroup_v1_tail
cgroup_v2 = pid_to_cgroup_v2(pid)
for i in soft_actions_list:
unit = i[0]
if unit == 'name':
u = name
else:
elif unit == 'cgroup_v1':
u = cgroup_v1
service = ''
cgroup_v1_tail = cgroup_v1.rpartition('/')[2]
if cgroup_v1_tail.endswith('.service'):
service = cgroup_v1_tail
else:
u = cgroup_v2
service = ''
cgroup_v2_tail = cgroup_v2.rpartition('/')[2]
if cgroup_v2_tail.endswith('.service'):
service = cgroup_v2_tail
regexp = i[1]
command = i[2]
if search(regexp, u) is not None:
log("Regexp '{}' matches with {} '{}'".format(
regexp, unit, u))
@ -2824,10 +2830,7 @@ badness_adj_re_uid_list = []
badness_adj_re_cgroup_v1_list = []
badness_adj_re_cgroup_v2_list = []
badness_adj_re_realpath_list = []
badness_adj_re_cwd_list = []
soft_actions_list = []
# separator for optional parameters (that starts with @)
@ -2846,8 +2849,10 @@ try:
etc = line.startswith('@SOFT_ACTION_RE_NAME')
etc2 = line.startswith('@SOFT_ACTION_RE_CGROUP_V1')
etc2_2 = line.startswith('@SOFT_ACTION_RE_CGROUP_V2')
if not a and not b and not c and not d and not etc and not etc2:
if (not a and not b and not c and not d and not etc and
not etc2 and not etc2_2):
a = line.partition('=')
key = a[0].strip()
@ -2891,6 +2896,22 @@ try:
soft_actions_list.append(zzz)
if etc2_2:
a = line.partition('@SOFT_ACTION_RE_CGROUP_V2')[
2].partition(opt_separator)
a1 = 'cgroup_v2'
a2 = a[0].strip()
valid_re(a2)
a3 = a[2].strip()
zzz = (a1, a2, a3)
soft_actions_list.append(zzz)
if line.startswith('@BADNESS_ADJ_RE_NAME'):
a = line.partition('@BADNESS_ADJ_RE_NAME')[2].strip(
' \n').partition(opt_separator)

13
nohang/nohang-desktop.conf
View File

@ -414,18 +414,15 @@ ignore_positive_oom_score_adj = False
8. Customize soft corrective actions
TODO: docs
Run the command instead of sending a signal with at soft corrective action
if the victim's name or cgroup matches the regular expression.
Syntax:
KEY REGEXP SEPARATOR COMMAND
@SOFT_ACTION_RE_NAME ^foo$ /// kill -KILL $PID
@SOFT_ACTION_RE_NAME ^bash$ /// kill -9 $PID
KEY REGEXP SEPARATOR COMMAND
@SOFT_ACTION_RE_NAME ^foo$ /// kill -USR1 $PID
@SOFT_ACTION_RE_CGROUP_V1 ^/system\.slice/ /// systemctl restart $SERVICE
@SOFT_ACTION_RE_CGROUP_V1 /foo\.service$ /// systemctl restart $SERVICE
@SOFT_ACTION_RE_NAME ^tail$ /// kill -TERM $PID
@SOFT_ACTION_RE_CGROUP_V2 /foo\.service$ /// systemctl restart $SERVICE
$PID will be replaced by process PID.
$NAME will be replaced by process name.

13
nohang/nohang.conf
View File

@ -364,18 +364,15 @@ ignore_positive_oom_score_adj = False
8. Customize soft corrective actions
TODO: docs
Run the command instead of sending a signal with at soft corrective action
if the victim's name or cgroup matches the regular expression.
Syntax:
KEY REGEXP SEPARATOR COMMAND
@SOFT_ACTION_RE_NAME ^foo$ /// kill -KILL $PID
@SOFT_ACTION_RE_NAME ^bash$ /// kill -9 $PID
KEY REGEXP SEPARATOR COMMAND
@SOFT_ACTION_RE_NAME ^foo$ /// kill -USR1 $PID
@SOFT_ACTION_RE_CGROUP_V1 ^/system\.slice/ /// systemctl restart $SERVICE
@SOFT_ACTION_RE_CGROUP_V1 /foo\.service$ /// systemctl restart $SERVICE
@SOFT_ACTION_RE_NAME ^tail$ /// kill -TERM $PID
@SOFT_ACTION_RE_CGROUP_V2 /foo\.service$ /// systemctl restart $SERVICE
$PID will be replaced by process PID.
$NAME will be replaced by process name.