[0/6] mm/damon/schemes: Extend stats for better online analysis and tuning

Message

SeongJae Park Dec. 10, 2021, 3 p.m. UTC

To help online access pattern analysis and tuning of DAMON-based
Operation Schemes (DAMOS), DAMOS provides simple statistics for each
scheme.  Introduction of DAMOS time/space quota further made the tuning
easier by making the risk management easier.  However, that also made
understanding of the working schemes a little bit more difficult.

For an example, progress of a given scheme can now be throttled by not
only the aggressiveness of the target access pattern, but also the
time/space quotas.  So, when a scheme is showing unexpectedly slow
progress, it's difficult to know by what the progress of the scheme is
throttled, with currently provided statistics.

This patchset extends the statistics to contain some metrics that can be
helpful for such online schemes analysis and tuning (patches 1-2),
exports those to users (patches 3 and 5), and add documents (patches 4
and 6).

SeongJae Park (6):
  mm/damon/schemes: Account scheme actions that successfully applied
  mm/damon/schemes: Account how many times quota limit has exceeded
  mm/damon/reclaim: Provide reclamation statistics
  Docs/admin-guide/mm/damon/reclaim: Document statistics parameters
  mm/damon/dbgfs: Support all DAMOS stats
  Docs/admin-guide/mm/damon/usage: Update for schemes statistics

 .../admin-guide/mm/damon/reclaim.rst          | 25 ++++++++++
 Documentation/admin-guide/mm/damon/usage.rst  |  9 ++--
 include/linux/damon.h                         | 30 +++++++++---
 mm/damon/core.c                               | 15 ++++--
 mm/damon/dbgfs.c                              |  6 ++-
 mm/damon/paddr.c                              | 13 +++---
 mm/damon/reclaim.c                            | 46 +++++++++++++++++++
 mm/damon/vaddr.c                              | 30 ++++++------
 8 files changed, 136 insertions(+), 38 deletions(-)