[RFC PATCH v2 0/6] mm: working set reporting

[Yuanchu Xie]

RFC v1: https://lore.kernel.org/linux-mm/20230509185419.1088297-1-yuanchu@xxxxxxxxxx/
For background and interfaces, see the RFC v1 posting.

Changes from v1 -> v2:
- Refactored the patchs into smaller pieces
- Renamed interfaces and functions from wss to wsr (Working Set Reporting)
- Fixed build errors when CONFIG_WSR is not set
- Changed working_set_num_bins to u8 for virtio-balloon
- Added support for per-NUMA node reporting for virtio-balloon

The RFC adds CONFIG_WSR and requires MGLRU to function. T.J. and I aim to support
the active/inactive LRU and working set estimation from the userspace as well.
This series should be build with the following configs:
CONFIG_LRU_GEN=y
CONFIG_LRU_GEN_ENABLED=y
CONFIG_VIRTIO_BALLOON=y
CONFIG_WSR=y

TODO list:
- There's a hack in mm/vmscan.c that calls into the virtio-balloon driver,
  which doesn't work if CONFIG_VIRTIO_BALLOON=m. T.J. Alumbaugh (talumbau@xxxxxxxxxx)
  and I plan on solving this problem with a working set notification mechanism
  that would allow multiple consumers to subscribe for working set changes.
- memory.reaccess.histogram does not consider swapped out pages to be reaccessed.
  I plan to implement this with the shadow entry computed from mm/workingset.c.

QEMU device implementation:
https://lists.gnu.org/archive/html/qemu-devel/2023-05/msg06617.html

virtio-dev spec proposal v1 (v2 to be posted by T.J.):
https://lore.kernel.org/virtio-dev/CABmGT5Hv6Jd_F9EoQqVMDo4w5=7wJYmS4wwYDqXK3wov44Tf=w@xxxxxxxxxxxxxx/

LSF/MM discussion slides:
https://lore.kernel.org/linux-mm/CABmGT5HK9xHz=E4q4sECCD8XodP9DUcH0dMeQ8kznUQB5HTQhQ@xxxxxxxxxxxxxx/

T.J. Alumbaugh (1):
  virtio-balloon: Add Working Set reporting

Yuanchu Xie (5):
  mm: aggregate working set information into histograms
  mm: add working set refresh threshold to rate-limit aggregation
  mm: report working set when under memory pressure
  mm: extend working set reporting to memcgs
  mm: add per-memcg reaccess histogram

 drivers/base/node.c                 |   3 +
 drivers/virtio/virtio_balloon.c     | 288 +++++++++++++++++
 include/linux/balloon_compaction.h  |   3 +
 include/linux/memcontrol.h          |   6 +
 include/linux/mmzone.h              |   5 +
 include/linux/wsr.h                 | 114 +++++++
 include/uapi/linux/virtio_balloon.h |  33 ++
 mm/Kconfig                          |   7 +
 mm/Makefile                         |   1 +
 mm/internal.h                       |  12 +
 mm/memcontrol.c                     | 351 ++++++++++++++++++++-
 mm/mmzone.c                         |   3 +
 mm/vmscan.c                         | 194 +++++++++++-
 mm/wsr.c                            | 464 ++++++++++++++++++++++++++++
 14 files changed, 1480 insertions(+), 4 deletions(-)
 create mode 100644 include/linux/wsr.h
 create mode 100644 mm/wsr.c

-- 
2.41.0.162.gfafddb0af9-goog