[PATCH 0/3] workqueue: expose per-workqueue stats in debugfs

[Wilson Felipe Pereira <wfelipe@google.com>]

struct pool_workqueue already tracks runtime counters in pwq->stats[],
pwq->total_in_flight, and pwq->nr_active, but reading them currently
requires tools/workqueue/wq_monitor.py with drgn and kernel DWARF
debuginfo.

This series:
- Preserves pwq->stats[] in wq->retired_stats[] when unbound pwqs are
  released so cumulative per-workqueue counters do not go backwards.
- Exposes per-workqueue stats via /sys/kernel/debug/workqueue/stats so
  they can be read directly on systems without drgn or debuginfo.
- Updates wq_monitor.py to include wq->retired_stats[] and report a
  'queued' column alongside 'infl'.

Wilson Felipe Pereira (3):
  workqueue: preserve pwq->stats[] when unbound pwqs are released
  workqueue: expose per-workqueue stats in debugfs
  tools/workqueue: report queued items and retired stats in
    wq_monitor.py

 Documentation/core-api/workqueue.rst |  47 +++++++-----
 kernel/workqueue.c                   | 105 +++++++++++++++++++++++++++
 tools/workqueue/wq_monitor.py        |  24 +++++-
 3 files changed, 155 insertions(+), 21 deletions(-)

-- 
2.56.0.218.g1ec904b173-goog