[0/8] Allow DAMON user code independent of monitoring primitives

Message

SeongJae Park Feb. 15, 2022, 6:45 p.m. UTC

In-kernel DAMON user code is required to configure the monitoring
context (struct damon_ctx) with proper monitoring primitives (struct
damon_primitive).  This makes the user code dependent to all supporting
monitoring primitives.  For example, DAMON debugfs interface depends on
both DAMON_VADDR and DAMON_PADDR, though some users have interest in
only one use case.  As more monitoring primitives are introduced, the
problem will be bigger.

To minimize such unnecessary dependency, this patchset makes monitoring
primitives can be registered by the implemnting code and later
dynamically searched and selected by the user code.

In addition to that, this patchset renames monitoring primitives to
monitoring operations, which is more easy to intuitively understand what
it means and how it would be structed.

SeongJae Park (8):
  mm/damon: Rename damon_primitives to damon_operations
  mm/damon: Let monitoring operations can be registered and selected
  mm/damon/paddr,vaddr: Register themselves to DAMON in subsys_initcall
  mm/damon/reclaim: Use damon_select_ops() instead of
    damon_{v,p}a_set_operations()
  mm/damon/dbgfs: Use damon_select_ops() instead of
    damon_{v,p}a_set_operations()
  mm/damon/dbgfs: Use operations id for knowing if the target has pid
  mm/damon/dbgfs-test: Fix is_target_id() change
  mm/damon/paddr,vaddr: Remove
    damon_{p,v}a_{target_valid,set_operations}()

 include/linux/damon.h                     |  72 ++++++------
 mm/damon/Kconfig                          |  12 +-
 mm/damon/Makefile                         |   4 +-
 mm/damon/core.c                           | 131 ++++++++++++++++------
 mm/damon/dbgfs-test.h                     |   4 +-
 mm/damon/dbgfs.c                          |  20 +++-
 mm/damon/{prmtv-common.c => ops-common.c} |   2 +-
 mm/damon/{prmtv-common.h => ops-common.h} |   0
 mm/damon/paddr.c                          |  36 +++---
 mm/damon/reclaim.c                        |   4 +-
 mm/damon/vaddr-test.h                     |   2 +-
 mm/damon/vaddr.c                          |  33 +++---
 12 files changed, 209 insertions(+), 111 deletions(-)
 rename mm/damon/{prmtv-common.c => ops-common.c} (99%)
 rename mm/damon/{prmtv-common.h => ops-common.h} (100%)