This is a futher revised version of the pids v6 patchset[1]. The main
changes include:
* Actually separate the subsystem callback bitmasks for use with
for_each_subsys_which(needs_*_callback, ...). Also switch from the
usage of explicit ss_mask checking with for_each_subsys() with
for_each_subsys_which().
* Pass an opaque cgroup_fork_state structure between the
cgroup_{can,cancel,post}_fork hooks which stores the current
task_struct's css_set. The refcount bumping and dropping is handled
within cgroup_cfs_{get,put}() respectively. This is done so that
the internal implementation of cgroup_fork_state is not exposed to
copy_process(), while also allowing the caller to decide when they
want to snapshot the current css_set.
* Fix a bug where migrating a task between cgroup hierachies would not
decrement pids.counter in the source hierarchy. This would cause
limits to be enforced prematurely due to residual charges on the pid
counter. This is done by adding a detach() callback that alerts a
subsystem to a task detaching from it.
[1]: https://lkml.org/lkml/2015/3/14/2
Aleksa Sarai (4):
cgroups: use bitmask to filter for_each_subsys
cgroups: replace explicit ss_mask checking with for_each_subsys_which
cgroups: allow a cgroup subsystem to reject a fork
cgroups: implement the PIDs subsystem
include/linux/cgroup.h | 42 +++++-
include/linux/cgroup_subsys.h | 4 +
init/Kconfig | 16 +++
kernel/Makefile | 1 +
kernel/cgroup.c | 244 ++++++++++++++++++++++++++-------
kernel/cgroup_pids.c | 310 ++++++++++++++++++++++++++++++++++++++++++
kernel/fork.c | 38 +++++-
7 files changed, 596 insertions(+), 59 deletions(-)
create mode 100644 kernel/cgroup_pids.c
--
2.3.4
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