[v5,00/16] treewide: Refactor heap related implementation

Message

Kuan-Wei Chiu May 14, 2024, 8:41 a.m. UTC

This patch series focuses on several adjustments related to heap
implementation. Firstly, a type-safe interface has been added to the
min_heap, along with the introduction of several new functions to
enhance its functionality. Additionally, the heap implementation for
bcache and bcachefs has been replaced with the generic min_heap
implementation from include/linux. Furthermore, several typos have been
corrected.

Previous discussion with Kent Overstreet:
https://lkml.kernel.org/ioyfizrzq7w7mjrqcadtzsfgpuntowtjdw5pgn4qhvsdp4mqqg@nrlek5vmisbu

Regards,
Kuan-Wei

---

You can preview this patch series on the 'refactor-heap' branch of
the repository at the following link:

https://github.com/visitorckw/linux

Changes in v5:
- Rebase on the block tree to resolve the conflict in bcache.
- Fix missing initialization for heap data pointer in bcache's
  bch_btree_node_read_done().

Changes in v4:
- Change struct initializations to use designated initializers.
- Replace memcpy() with func->swp() in heap_del() due to issues with
  set_backpointer in bcachefs when setting idx.
- Fix an error in ec_stripes_heap_swap() where
  ec_stripes_heap_set_backpointer() should be called after swapping.

Changes in v3:
- Avoid heap->heap.nr to eliminate the nested types.
- Add MIN_HEAP_PREALLOCATED macro for preallocating some elements.
- Use min_heap_sift_up() in min_heap_push().
- Fix a bug in heap_del() where we should copy the last element to
  'data + idx * element_size' instead of 'data'.
- Add testcases for heap_del().
- Fix bugs in bcache/bcachefs patches where the parameter types in
  some compare functions should have been 'type **', but were
  mistakenly written as 'type *'.

Changes in v2:
- Add attribute __always_unused to the compare and swap functions
  that do not use the args parameter.
- Rename min_heapify() to min_heap_sift_down().
- Update lib/test_min_heap.c to use min_heap_init().
- Refine the commit message for bcache and bcachefs.
- Adjust the order of patches in the patch series.

Link to v4: https://lore.kernel.org/[e-mail]
Link to v3: https://lore.kernel.org/[e-mail]
Link to v2: https://lore.kernel.org/[e-mail]
Link to v1: https://lkml.kernel.org/[e-mail]

Kuan-Wei Chiu (16):
  perf/core: Fix several typos
  bcache: Fix typo
  bcachefs: Fix typo
  lib min_heap: Add type safe interface
  lib min_heap: Add min_heap_init()
  lib min_heap: Add min_heap_peek()
  lib min_heap: Add min_heap_full()
  lib min_heap: Add args for min_heap_callbacks
  lib min_heap: Add min_heap_sift_up()
  lib min_heap: Add min_heap_del()
  lib min_heap: Update min_heap_push() and min_heap_pop() to return bool
    values
  lib min_heap: Rename min_heapify() to min_heap_sift_down()
  lib min_heap: Update min_heap_push() to use min_heap_sift_up()
  lib/test_min_heap: Add test for heap_del()
  bcache: Remove heap-related macros and switch to generic min_heap
  bcachefs: Remove heap-related macros and switch to generic min_heap

 drivers/md/bcache/alloc.c      |  64 ++++++++---
 drivers/md/bcache/bcache.h     |   2 +-
 drivers/md/bcache/bset.c       | 124 ++++++++++++++--------
 drivers/md/bcache/bset.h       |  40 +++----
 drivers/md/bcache/btree.c      |  69 +++++++-----
 drivers/md/bcache/extents.c    |  53 ++++++----
 drivers/md/bcache/movinggc.c   |  41 +++++--
 drivers/md/bcache/super.c      |   3 +-
 drivers/md/bcache/sysfs.c      |   4 +-
 drivers/md/bcache/util.c       |   2 +-
 drivers/md/bcache/util.h       |  67 +-----------
 drivers/md/bcache/writeback.c  |  13 ++-
 drivers/md/dm-vdo/repair.c     |  19 ++--
 drivers/md/dm-vdo/slab-depot.c |  14 +--
 fs/bcachefs/clock.c            |  43 ++++++--
 fs/bcachefs/clock_types.h      |   2 +-
 fs/bcachefs/ec.c               |  76 ++++++++-----
 fs/bcachefs/ec_types.h         |   2 +-
 fs/bcachefs/util.c             |   2 +-
 fs/bcachefs/util.h             | 118 +--------------------
 include/linux/min_heap.h       | 188 +++++++++++++++++++++++++--------
 kernel/events/core.c           |  29 ++---
 lib/test_min_heap.c            |  75 +++++++++----
 23 files changed, 583 insertions(+), 467 deletions(-)