I recently received a report of a libvirt+Xen installation reaching the pids
cgroup controller TasksMax limit
kernel: [71282.213347] cgroup: fork rejected by pids controller in
/system.slice/libvirtd.service
The default setting of TaskMax is 512 on this system
# cat /sys/fs/cgroup/pids/system.slice/libvirtd.service/pids.max
512
Depending on domain type and configuration, I've noticed between 5-7 tasks (IO
threads, qemu process, etc.) are created when starting a domain. It doesn't take
too many domains before the 512 limit is reached.
LimitNOFILE was recently changed by commit 27cd763500 to support 4096 domains.
Following similar logic, would it be ok to increase TasksMax to 32768? That
would accommodate 4096 domains with 8 tasks each. TasksMax also supports the
special value of "infinity", but that seems a bit aggressive to me.
Regards,
Jim
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