Christian Brauner ef2c41cf38 clone3: allow spawning processes into cgroups ... This adds support for creating a process in a different cgroup than its parent. Callers can limit and account processes and threads right from the moment they are spawned: - A service manager can directly spawn new services into dedicated cgroups. - A process can be directly created in a frozen cgroup and will be frozen as well. - The initial accounting jitter experienced by process supervisors and daemons is eliminated with this. - Threaded applications or even thread implementations can choose to create a specific cgroup layout where each thread is spawned directly into a dedicated cgroup. This feature is limited to the unified hierarchy. Callers need to pass a directory file descriptor for the target cgroup. The caller can choose to pass an O_PATH file descriptor. All usual migration restrictions apply, i.e. there can be no processes in inner nodes. In general, creating a process directly in a target cgroup adheres to all migration restrictions. One of the biggest advantages of this feature is that CLONE_INTO_GROUP does not need to grab the write side of the cgroup cgroup_threadgroup_rwsem. This global lock makes moving tasks/threads around super expensive. With clone3() this lock is avoided. Cc: Tejun Heo <tj@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Li Zefan <lizefan@huawei.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: cgroups@vger.kernel.org Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2020-02-12 17:57:51 -05:00
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autogroup.h
clock.h
coredump.h
cpufreq.h	sched/fair: Remove redundant call to cpufreq_update_util()	2020-01-17 10:19:22 +01:00
cputime.h
deadline.h
debug.h
hotplug.h
idle.h
init.h
isolation.h	genirq, sched/isolation: Isolate from handling managed interrupts	2020-01-22 16:29:49 +01:00
jobctl.h
loadavg.h
mm.h	exit/exec: Seperate mm_release()	2019-11-20 09:40:08 +01:00
nohz.h
numa_balancing.h
prio.h
rt.h
signal.h
smt.h
stat.h
sysctl.h
task_stack.h
task.h	clone3: allow spawning processes into cgroups	2020-02-12 17:57:51 -05:00
topology.h
types.h
user.h
wake_q.h
xacct.h