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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-02 08:04:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-02 08:04:23 -0700 |
| commit | 8bdc69b764013a9b5ebeef7df8f314f1066c5d79 (patch) | |
| tree | 335dcb29c9ba06142917121d551575d360eca63e /init | |
| parent | 76ec51ef5edfe540bbc3c61b860f88deb8e6a37b (diff) | |
| parent | 20f1f4b5ffb870631bf4a4e7c7ba10e3528ae6a6 (diff) | |
Merge branch 'for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup updates from Tejun Heo:
- a new PIDs controller is added. It turns out that PIDs are actually
an independent resource from kmem due to the limited PID space.
- more core preparations for the v2 interface. Once cpu side interface
is settled, it should be ready for lifting the devel mask.
for-4.3-unified-base was temporarily branched so that other trees
(block) can pull cgroup core changes that blkcg changes depend on.
- a non-critical idr_preload usage bug fix.
* 'for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup: pids: fix invalid get/put usage
cgroup: introduce cgroup_subsys->legacy_name
cgroup: don't print subsystems for the default hierarchy
cgroup: make cftype->private a unsigned long
cgroup: export cgrp_dfl_root
cgroup: define controller file conventions
cgroup: fix idr_preload usage
cgroup: add documentation for the PIDs controller
cgroup: implement the PIDs subsystem
cgroup: allow a cgroup subsystem to reject a fork
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index ba1e6eaf4c36..bb9b4dd55889 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -947,6 +947,22 @@ config CGROUP_FREEZER Provides a way to freeze and unfreeze all tasks in a cgroup. +config CGROUP_PIDS + bool "PIDs cgroup subsystem" + help + Provides enforcement of process number limits in the scope of a + cgroup. Any attempt to fork more processes than is allowed in the + cgroup will fail. PIDs are fundamentally a global resource because it + is fairly trivial to reach PID exhaustion before you reach even a + conservative kmemcg limit. As a result, it is possible to grind a + system to halt without being limited by other cgroup policies. The + PIDs cgroup subsystem is designed to stop this from happening. + + It should be noted that organisational operations (such as attaching + to a cgroup hierarchy will *not* be blocked by the PIDs subsystem), + since the PIDs limit only affects a process's ability to fork, not to + attach to a cgroup. + config CGROUP_DEVICE bool "Device controller for cgroups" help |