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This RFC builds on T.J. Mercier's earlier series [1] which added
a memory.stat counter for exported dma-bufs and a binder-backed
mechanism to transfer charges between cgroups.
The first commit is taken almost verbatim from TJ's series:
it introduces MEMCG_DMABUF as a dedicated per-cgroup stat, so that
the total exported dma-buf footprint is visible both system-wide
(via the root cgroup) and per-application (via per-process cgroups).
This avoids the overhead of DMABUF_SYSFS_STATS and integrates
naturally into the existing cgroup memory hierarchy.
The rest of the series departs from TJ's approach. While the first
commit introduces the memcg stat infrastructure for dmabufs, the
export-time charging it introduces in dma_buf_export() is then
superseded: we charge at dma_heap_ioctl_allocate() time, using a
new charge_pid_fd field in struct dma_heap_allocation_data. The
allocator opens a pidfd for its client (e.g., from binder's
sender_pid), passes it to the ioctl, and the kernel charges the
buffer directly to the client's cgroup at allocation time, so no
transfer step is needed.
This decouples the accounting path from binder entirely:
any allocator that knows its client's PID can use the pid_fd
mechanism regardless of the IPC transport in use.
The cross-cgroup charging capability requires access control.
Patches #3 and #4 add a generic LSM hook (security_dma_heap_alloc)
and an SELinux implementation based on a new dma_heap object class
with a charge_to permission, so policy authors can express which
domains are allowed to charge memory to another domain's cgroup.
Last patch adds some tests to verify the new charge_pid_fd field.
We are sending it as an RFC to spark broader discussion. It may or
may not be the right path forward, and we welcome feedback on the
trade-offs.
Collision note: Eric Chanudet's series [2] adds __GFP_ACCOUNT to
system_heap page allocations as an opt-in module parameter. That
approach charges pages to the allocator's own kmem, which overlaps with
MEMCG_DMABUF. This series explicitly removes __GFP_ACCOUNT from system
heap allocations and routes all accounting through the MEMCG_DMABUF
path to avoid double-counting.
[1] https://lore.kernel.org/cgroups/20230109213809.418135-1-tjmercier@google.co…
[2] https://lore.kernel.org/r/20260113-dmabuf-heap-system-memcg-v2-0-e85722cc2f…
Signed-off-by: Albert Esteve <aesteve(a)redhat.com>
---
Albert Esteve (4):
dma-heap: charge dma-buf memory via explicit memcg
security: dma-heap: Add dma_heap_alloc LSM hook
selinux: Restrict cross-cgroup dma-heap charging
selftests/dmabuf-heaps: Add dma-buf memcg accounting tests
T.J. Mercier (1):
memcg: Track exported dma-buffers
Documentation/admin-guide/cgroup-v2.rst | 5 +
drivers/dma-buf/dma-buf.c | 7 +
drivers/dma-buf/dma-heap.c | 54 +++++-
drivers/dma-buf/heaps/system_heap.c | 2 -
include/linux/dma-buf.h | 4 +
include/linux/lsm_hook_defs.h | 1 +
include/linux/memcontrol.h | 37 ++++
include/linux/security.h | 7 +
include/uapi/linux/dma-heap.h | 6 +
mm/memcontrol.c | 19 ++
security/security.c | 16 ++
security/selinux/hooks.c | 7 +
security/selinux/include/classmap.h | 1 +
tools/testing/selftests/cgroup/Makefile | 2 +-
tools/testing/selftests/cgroup/test_memcontrol.c | 143 +++++++++++++-
tools/testing/selftests/dmabuf-heaps/config | 1 +
tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c | 126 ++++++++++++-
tools/testing/selftests/dmabuf-heaps/vmtest.sh | 205 +++++++++++++++++++++
18 files changed, 633 insertions(+), 10 deletions(-)
---
base-commit: 74fe02ce122a6103f207d29fafc8b3a53de6abaf
change-id: 20260508-v2_20230123_tjmercier_google_com-f44fcfb16530
Best regards,
--
Albert Esteve <aesteve(a)redhat.com>