* [LTP] [PATCH] controllers/memcg_stress: fix order of process cleanup
@ 2021-07-20 14:34 Krzysztof Kozlowski
2021-09-08 15:26 ` Cyril Hrubis
0 siblings, 1 reply; 2+ messages in thread
From: Krzysztof Kozlowski @ 2021-07-20 14:34 UTC (permalink / raw)
To: ltp
The memcg_stress_test was forking test processes and adding them to new
cgroup. However cleanup - killing forked process and cgroup removal -
was iterating in mixed up order: killing the newest process but trying
to remove the oldest cgroup.
This could work if all processes died already via earlier "kill -USR1"
but at least in case of Ubuntu with v4.15 kernel this failed and left
cgroups not cleaned up:
+ kill -KILL 3147
/home/azure/ltp-install/testcases/bin/memcg_stress_test.sh: 96: kill: No such process
+ wait 3147
+ rmdir /dev/memcg/0
/home/azure/ltp-install/testcases/bin/memcg_stress_test.sh: 98: /home/azure/ltp-install/testcases/bin/memcg_stress_test.sh: Cannot fork
$ ll /dev/memcg
0 107 116 125 134 143 18 27 36 45 54 63 72 81 90
1 108 117 126 135 144 19 28 37 46 55 64 73 82 91
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh b/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh
index cd75c704a9a4..c2501e164018 100755
--- a/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh
+++ b/testcases/kernel/controllers/memcg/stress/memcg_stress_test.sh
@@ -78,7 +78,7 @@ run_stress()
mkdir /dev/memcg/$i 2> /dev/null
memcg_process_stress $mem_size $interval &
echo $! > /dev/memcg/$i/tasks
- pids="$! $pids"
+ pids="$pids $!"
done
for pid in $pids; do
--
2.27.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [LTP] [PATCH] controllers/memcg_stress: fix order of process cleanup
@ 2021-09-08 15:26 ` Cyril Hrubis
0 siblings, 0 replies; 2+ messages in thread
From: Cyril Hrubis @ 2021-09-08 15:26 UTC (permalink / raw)
To: Krzysztof Kozlowski; +Cc: ltp
Hi!
Good catch, applied, thanks.
--
Cyril Hrubis
chrubis@suse.cz
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-07-20 14:34 [LTP] [PATCH] controllers/memcg_stress: fix order of process cleanup Krzysztof Kozlowski
2021-09-08 15:26 ` Cyril Hrubis
2021-09-08 15:26 ` Cyril Hrubis
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