* [LTP] [PATCH] controllers/cpuacct: Fix deleting directories errors
@ 2021-09-15 9:50 ` Dai Shili
2021-09-15 10:50 ` Petr Vorel
0 siblings, 1 reply; 3+ messages in thread
From: Dai Shili @ 2021-09-15 9:50 UTC (permalink / raw)
To: ltp
To remove a directory hierarchy on a normal file system you can use rm command to
remove all files from each subdirectory and then remove the parent directories.
But a cgroup which doesn't have any children and is associated only with zombie processes
is considered empty and can not be removed by rm.
The following errors will be reported.
cpuacct 1 TINFO: removing created directories
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cgroup.procs': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpu.cfs_period_us': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpu.stat': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.usage_percpu_sys': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpu.shares': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.usage_percpu': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.stat': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.usage': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/subgroup_1/cgroup.procs': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/subgroup_1/cpu.cfs_period_us': Operation not permitted
rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/subgroup_1/cpu.stat': Operation not permitted
...
It's recommended to use rmdir command.
[1] http://blog.tinola.com/?e=21
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/cgroup-v2.rst#n237
Reviewed-by: Yang Xu <xuyang2018.jy@fujitsu.com>
Signed-off-by: Dai Shili <daisl.fnst@fujitsu.com>
---
testcases/kernel/controllers/cpuacct/cpuacct.sh | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/testcases/kernel/controllers/cpuacct/cpuacct.sh b/testcases/kernel/controllers/cpuacct/cpuacct.sh
index 99258c2..f526d0f 100755
--- a/testcases/kernel/controllers/cpuacct/cpuacct.sh
+++ b/testcases/kernel/controllers/cpuacct/cpuacct.sh
@@ -122,7 +122,10 @@ cleanup()
if [ "$testpath" ]; then
tst_res TINFO "removing created directories"
- rm -rf $testpath
+ if [ -d "$testpath/subgroup_1" ]; then
+ rmdir $testpath/subgroup_*
+ fi
+ rmdir $testpath
fi
if [ "$mounted" -ne 1 ]; then
--
1.8.3.1
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [LTP] [PATCH] controllers/cpuacct: Fix deleting directories errors
@ 2021-09-15 10:50 ` Petr Vorel
2021-09-15 11:21 ` Petr Vorel
0 siblings, 1 reply; 3+ messages in thread
From: Petr Vorel @ 2021-09-15 10:50 UTC (permalink / raw)
To: Dai Shili; +Cc: ltp
Hi Dai, Xu,
> To remove a directory hierarchy on a normal file system you can use rm command to
> remove all files from each subdirectory and then remove the parent directories.
> But a cgroup which doesn't have any children and is associated only with zombie processes
> is considered empty and can not be removed by rm.
> The following errors will be reported.
> cpuacct 1 TINFO: removing created directories
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cgroup.procs': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpu.cfs_period_us': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpu.stat': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.usage_percpu_sys': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpu.shares': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.usage_percpu': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.stat': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/cpuacct.usage': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/subgroup_1/cgroup.procs': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/subgroup_1/cpu.cfs_period_us': Operation not permitted
> rm: cannot remove '/sys/fs/cgroup/cpu,cpuacct/ltp_cpuacct/subgroup_1/cpu.stat': Operation not permitted
> ...
> It's recommended to use rmdir command.
Sorry for introducing a regression and for correction.
I'll revert on your behalf commit d6cc08592 ("controllers/cpuacct: Simplify
deleting directories"), with your explanation.
Kind regards,
Petr
> [1] http://blog.tinola.com/?e=21
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/cgroup-v2.rst#n237
> Reviewed-by: Yang Xu <xuyang2018.jy@fujitsu.com>
> Signed-off-by: Dai Shili <daisl.fnst@fujitsu.com>
> ---
> testcases/kernel/controllers/cpuacct/cpuacct.sh | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
> diff --git a/testcases/kernel/controllers/cpuacct/cpuacct.sh b/testcases/kernel/controllers/cpuacct/cpuacct.sh
> index 99258c2..f526d0f 100755
> --- a/testcases/kernel/controllers/cpuacct/cpuacct.sh
> +++ b/testcases/kernel/controllers/cpuacct/cpuacct.sh
> @@ -122,7 +122,10 @@ cleanup()
> if [ "$testpath" ]; then
> tst_res TINFO "removing created directories"
> - rm -rf $testpath
> + if [ -d "$testpath/subgroup_1" ]; then
> + rmdir $testpath/subgroup_*
> + fi
> + rmdir $testpath
> fi
> if [ "$mounted" -ne 1 ]; then
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [LTP] [PATCH] controllers/cpuacct: Fix deleting directories errors
@ 2021-09-15 11:21 ` Petr Vorel
0 siblings, 0 replies; 3+ messages in thread
From: Petr Vorel @ 2021-09-15 11:21 UTC (permalink / raw)
To: Dai Shili, ltp
Hi Dai, Xu,
...
> Sorry for introducing a regression and for correction.
> I'll revert on your behalf commit d6cc08592 ("controllers/cpuacct: Simplify
> deleting directories"), with your explanation.
FYI Merged!
Kind regards,
Petr
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-09-15 9:50 [LTP] [PATCH] controllers/cpuacct: Fix deleting directories errors Dai Shili
2021-09-15 9:50 ` Dai Shili
2021-09-15 10:50 ` Petr Vorel
2021-09-15 10:50 ` Petr Vorel
2021-09-15 11:21 ` Petr Vorel
2021-09-15 11:21 ` Petr Vorel
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