[PATCH 0/4] Track exported dma-buffers with memcg

[T.J. Mercier]

Based on discussions at LPC, this series adds a memory.stat counter for
exported dmabufs. This counter allows us to continue tracking
system-wide total exported buffer sizes which there is no longer any
way to get without DMABUF_SYSFS_STATS, and adds a new capability to
track per-cgroup exported buffer sizes. The total (root counter) is
helpful for accounting in-kernel dmabuf use (by comparing with the sum
of child nodes or with the sum of sizes of mapped buffers or FD
references in procfs) in addition to helping identify driver memory
leaks when in-kernel use continually increases over time. With
per-application cgroups, the per-cgroup counter allows us to quickly
see how much dma-buf memory an application has caused to be allocated.
This avoids the need to read through all of procfs which can be a
lengthy process, and causes the charge to "stick" to the allocating
process/cgroup as long as the buffer is alive, regardless of how the
buffer is shared (unless the charge is transferred).

The first patch adds the counter to memcg. The next two patches allow
the charge for a buffer to be transferred across cgroups which is
necessary because of the way most dmabufs are allocated from a central
process on Android. The fourth patch adds a SELinux hook to binder in
order to control who is allowed to transfer buffer charges.

[1] https://lore.kernel.org/all/20220617085702.4298-1-christian.koenig@amd.com/

Hridya Valsaraju (1):
  binder: Add flags to relinquish ownership of fds

T.J. Mercier (3):
  memcg: Track exported dma-buffers
  dmabuf: Add cgroup charge transfer function
  security: binder: Add transfer_charge SElinux hook

 Documentation/admin-guide/cgroup-v2.rst |  5 +++
 drivers/android/binder.c                | 36 +++++++++++++++--
 drivers/dma-buf/dma-buf.c               | 54 +++++++++++++++++++++++--
 include/linux/dma-buf.h                 |  5 +++
 include/linux/lsm_hook_defs.h           |  2 +
 include/linux/lsm_hooks.h               |  6 +++
 include/linux/memcontrol.h              |  7 ++++
 include/linux/security.h                |  2 +
 include/uapi/linux/android/binder.h     | 23 +++++++++--
 mm/memcontrol.c                         |  4 ++
 security/security.c                     |  6 +++
 security/selinux/hooks.c                |  9 +++++
 security/selinux/include/classmap.h     |  2 +-
 13 files changed, 149 insertions(+), 12 deletions(-)


base-commit: b7bfaa761d760e72a969d116517eaa12e404c262
-- 
2.39.0.314.g84b9a713c41-goog