Hello, Linus.
More change than I'd have liked at this stage. The pids controller
and the changes made to cgroup core to support it introduced and
revealed several important issues.
* Assigning membership to a newly created task and migrating it can
race leading to incorrect accounting. Oleg fixed it by widening
threadgroup synchronization. It looks like we'll be able to merge
it with a different percpu rwsem which is used in fork path making
things simpler and cheaper.
* The recent change to extend cgroup membership to zombies (so that
pid accounting can extend till the pid is actually released) missed
pinning the underlying data structures leading to use-after-free.
Fixed.
* v2 hierarchy was calling subsystem callbacks with the wrong target
cgroup_subsys_state based on the incorrect assumption that they
share the same target. pids is the first controller affected by
this. Subsys callbacks updated so that they can deal with
multi-target migrations.
Thanks.
The following changes since commit 527e9316f8ec44bd53d90fb9f611fa7ffff52bb9:
Linux 4.4-rc4 (2015-12-06 15:43:12 -0800)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-4.4-fixes
for you to fetch changes up to 0b98f0c04245877ae0b625a7f0aa55b8ff98e0c4:
Merge branch 'master' into for-4.4-fixes (2015-12-07 10:09:03 -0500)
----------------------------------------------------------------
Oleg Nesterov (2):
cgroup: pids: fix race between cgroup_post_fork() and cgroup_migrate()
cgroup: pids: kill pids_fork(), simplify pids_can_fork() and pids_cancel_fork()
Tejun Heo (6):
cgroup: fix cftype->file_offset handling
cgroup: make css_set pin its css's to avoid use-afer-free
cgroup_freezer: simplify propagation of CGROUP_FROZEN clearing in freezer_attach()
cgroup: fix handling of multi-destination migration from subtree_control enabling
cgroup_pids: don't account for the root cgroup
Merge branch 'master' into for-4.4-fixes
block/blk-cgroup.c | 6 +--
include/linux/cgroup-defs.h | 13 ++----
include/linux/cgroup.h | 47 ++++++++++-----------
kernel/cgroup.c | 99 ++++++++++++++++++++++++++++++++++----------
kernel/cgroup_freezer.c | 23 +++++-----
kernel/cgroup_pids.c | 77 +++++++++-------------------------
kernel/cpuset.c | 33 +++++++++------
kernel/events/core.c | 6 +--
kernel/fork.c | 9 ++--
kernel/sched/core.c | 12 +++---
mm/memcontrol.c | 45 ++++++++++----------
net/core/netclassid_cgroup.c | 6 ++-
net/core/netprio_cgroup.c | 9 ++--
13 files changed, 202 insertions(+), 183 deletions(-)
--
tejun
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