[PATCH 0/2] cgroup/dmem: introduce a peak file

[Thadeu Lima de Souza Cascardo <cascardo@igalia.com>]

Just like we have memory.peak, introduce a dmem.peak, which uses the
page_counter support for that.

It can be written to in order to reset the peak, but different from
memory.peak, which expects any write, dmem.peak expects the region name to
be written to it. That region peak is the one that is reset.

That requires ofp_peak to carry a pointer to the pool that was reset.

Writing a different region name will reset the different region and make
the original region peak get back to its non-reset value.

While at it, we reuse a helper from memcontrol, which we moved to
kernel/cgroup/cgroup.c.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
---
Thadeu Lima de Souza Cascardo (2):
      mm/page_counter: decouple peak_reset from peak_write
      cgroup/dmem: introduce a peak file

 Documentation/admin-guide/cgroup-v2.rst |  10 +++
 include/linux/cgroup-defs.h             |   7 ++
 kernel/cgroup/cgroup.c                  |  32 ++++++++
 kernel/cgroup/dmem.c                    | 132 ++++++++++++++++++++++++++++++--
 mm/memcontrol.c                         |  42 ++--------
 5 files changed, 183 insertions(+), 40 deletions(-)
---
base-commit: 7fd2df204f342fc17d1a0bfcd474b24232fb0f32
change-id: 20260409-dmem_peak-3abc1be95072

Best regards,
--  
Thadeu Lima de Souza Cascardo <cascardo@igalia.com>