[systemd-devel] Query on libpam-systemd

[pavi1729]

# systemd --version
systemd 219
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
+LIBCRYPTSETUP +GCRYPT -GNUTLS +ACL +XZ -LZ4 -SECCOMP +BLKID -ELFUTILS
+KMOD -IDN

On Fri, Jan 29, 2016 at 12:49 PM, Mantas Mikulėnas <grawity at gmail.com> wrote:
> On Fri, Jan 29, 2016 at 8:08 AM, pavi1729 <pavitra1729 at gmail.com> wrote:
>>
>> Hi,
>>   I have an issue with libpam-systemd which is interfering with
>> scheduler settings on my machine. Details as below
>>
>> --------------------------------------------------------------------------
>> File: linux/kernel/sched/core.c
>>
>> WITHOUT libpam-systemd
>>
>> [   36.278241] rt_bandwidth_enabled(): 1
>> [   36.281977] rt_policy(policy) : 1
>> [   36.285367] task_group_is_autogroup(task_group(p)) : 0
>> [   36.289883] task_group(p)->rt_bandwidth.rt_runtime : 950000000
>>
>>
>> WITH libpam-systemd INSTALLED
>>
>> [ 2096.713855] rt_bandwidth_enabled(): 1
>> [ 2096.717871] rt_policy(policy) : 1
>> [ 2096.721408] task_group_is_autogroup(task_group(p)) : 0
>> [ 2096.726180] task_group(p)->rt_bandwidth.rt_runtime: 0  <-- (gets set to
>> 0)
>>
>>
>> QUESTION: Why is libpam-systemd setting
>> task_group(p)->rt_bandwidth.rt_runtime to 0 ?
>
>
> Probably due to moving the process to a separate (per-user) cgroup; check
> /proc/self/cgroup.
>
> There are known kernel problems with RT scheduling; see also:
> https://github.com/systemd/systemd/blob/master/README#L99-L106
>
>>
>> SYSTEM DETAILS
>>
>> root at pavi:/home/pavi# uname -a
>> Linux pavi 3.18.21-pavi-g4c8a53e-dirty #43 SMP PREEMPT Fri Dec 18
>> 14:56:40 IST 2015 aarch64 aarch64 aarch64 GNU/Linux
>>
>>
>> root at pavi:/home/pavi# cat /etc/os-release
>> NAME="Ubuntu"
>> VERSION="15.04 (Vivid Vervet)"
>> ID=ubuntu
>> ID_LIKE=debian
>> PRETTY_NAME="Ubuntu 15.04"
>> VERSION_ID="15.04"
>> HOME_URL="http://www.ubuntu.com/"
>> SUPPORT_URL="http://help.ubuntu.com/"
>> BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
>
>
> But which systemd version?
>
> --
> Mantas Mikulėnas <grawity at gmail.com>