[GIT PULL] cgroup changes for v5.7-rc1

[Tejun Heo]

Hello, Linus.

* Christian extended clone3 so that processes can be spawned into cgroups
  directly. This is not only neat in terms of semantics but also avoids grabbing
  the global cgroup_threadgroup_rwsem for migration.

* Daniel added !root xattr support to cgroupfs. Userland already uses xattrs on
  cgroupfs for bookkeeping. This will allow delegated cgroups to support such
  usages.

* Prateek tried to make cpuset hotplug handling synchronous but that led to
  possible deadlock scenarios. Reverted.

* Other minor changes including release_agent_path handling cleanup.

Thanks.

The following changes since commit 2e5383d7904e60529136727e49629a82058a5607:

  cgroup1: don't call release_agent when it is "" (2020-03-04 11:53:33 -0500)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-5.7

for you to fetch changes up to 0c05b9bdbfe52ad9b391a28dd26f047715627e0c:

  docs: cgroup-v1: Document the cpuset_v2_mode mount option (2020-04-03 11:42:56 -0400)

----------------------------------------------------------------
Christian Brauner (6):
      cgroup: unify attach permission checking
      cgroup: add cgroup_get_from_file() helper
      cgroup: refactor fork helpers
      cgroup: add cgroup_may_write() helper
      clone3: allow spawning processes into cgroups
      selftests/cgroup: add tests for cloning into cgroups

Daniel Xu (4):
      kernfs: kvmalloc xattr value instead of kmalloc
      kernfs: Add removed_size out param for simple_xattr_set
      kernfs: Add option to enable user xattrs
      cgroupfs: Support user xattrs

Madhuparna Bhowmik (1):
      cgroup.c: Use built-in RCU list checking

Michal Koutný (1):
      cgroup: Clean up css_set task traversal

Prateek Sood (1):
      cpuset: Make cpuset hotplug synchronous

Suren Baghdasaryan (1):
      kselftest/cgroup: add cgroup destruction test

Tejun Heo (3):
      Merge branch 'for-5.6-fixes' into for-5.7
      cgroup: Restructure release_agent_path handling
      Revert "cpuset: Make cpuset hotplug synchronous"

Waiman Long (1):
      docs: cgroup-v1: Document the cpuset_v2_mode mount option

 Documentation/admin-guide/cgroup-v1/cpusets.rst   |  11 +
 fs/kernfs/inode.c                                 |  91 +++++-
 fs/kernfs/kernfs-internal.h                       |   2 +
 fs/xattr.c                                        |  17 +-
 include/linux/cgroup-defs.h                       |   5 +-
 include/linux/cgroup.h                            |  23 +-
 include/linux/kernfs.h                            |  11 +-
 include/linux/sched/task.h                        |   4 +
 include/linux/xattr.h                             |   3 +-
 include/uapi/linux/sched.h                        |   5 +
 kernel/cgroup/cgroup-v1.c                         |  34 +-
 kernel/cgroup/cgroup.c                            | 361 ++++++++++++++++------
 kernel/cgroup/cpuset.c                            |   8 +-
 kernel/cgroup/pids.c                              |  15 +-
 kernel/fork.c                                     |  19 +-
 mm/shmem.c                                        |   2 +-
 tools/testing/selftests/cgroup/Makefile           |   6 +-
 tools/testing/selftests/cgroup/cgroup_util.c      | 126 ++++++++
 tools/testing/selftests/cgroup/cgroup_util.h      |   4 +
 tools/testing/selftests/cgroup/test_core.c        | 177 +++++++++++
 tools/testing/selftests/clone3/clone3_selftests.h |  19 +-
 21 files changed, 795 insertions(+), 148 deletions(-)

-- 
tejun