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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acpi
asm-generic	Microblaze patches for 5.6-rc1	2020-02-04 11:58:07 +00:00
clocksource
crypto
drm
dt-bindings	ARM: SoC: late updates	2020-02-08 14:17:27 -08:00
keys
kunit
kvm
linux	clone3: allow spawning processes into cgroups	2020-02-12 17:57:51 -05:00
math-emu
media
misc
net	bonding/alb: properly access headers in bond_alb_xmit()	2020-02-05 14:28:09 +01:00
pcmcia
ras
rdma	RDMA/core: Make the entire API tree static	2020-01-30 16:28:52 -04:00
scsi
soc	ARM: SoC-related driver updates	2020-02-08 14:04:19 -08:00
sound	ARM: Device-tree updates	2020-02-08 13:58:44 -08:00
target
trace	ARM: SoC-related driver updates	2020-02-08 14:04:19 -08:00
uapi	clone3: allow spawning processes into cgroups	2020-02-12 17:57:51 -05:00
vdso
video
xen	xen: branch for v5.6-rc1	2020-02-05 17:44:14 +00:00