[PATCHSET,0/5] xfs: use slab caches for deferred log items

Message

Darrick J. Wong Oct. 19, 2021, 6:52 p.m. UTC

Hi all,

Since the adding of reflink and reverse mapping to the filesystem,
deferred log items are used quite a lot more frequently than they used
to be.  This means that we're cycling a lot of small objects through the
slab caches, just like we do with btree cursors.  Pack deferred item
contexts into memory pages more densely by creating separate slab caches
for each type, and shrink the intent items to use less memory.

If you're going to start using this mess, you probably ought to just
pull from my git trees, which are linked below.

This is an extraordinary way to destroy everything.  Enjoy!
Comments and questions are, as always, welcome.

--D

kernel git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=deferred-item-caches-5.16
---
 fs/xfs/libxfs/xfs_ag.c         |    2 -
 fs/xfs/libxfs/xfs_alloc.c      |   82 +++++++++++++++++++++++++++++++++++++---
 fs/xfs/libxfs/xfs_alloc.h      |   36 ++++++++++++++++++
 fs/xfs/libxfs/xfs_bmap.c       |   76 ++++++++++---------------------------
 fs/xfs/libxfs/xfs_bmap.h       |   35 +++--------------
 fs/xfs/libxfs/xfs_bmap_btree.c |    2 -
 fs/xfs/libxfs/xfs_defer.c      |   67 +++++++++++++++++++++++++++++++--
 fs/xfs/libxfs/xfs_defer.h      |    3 +
 fs/xfs/libxfs/xfs_ialloc.c     |    4 +-
 fs/xfs/libxfs/xfs_refcount.c   |   46 +++++++++++++++-------
 fs/xfs/libxfs/xfs_refcount.h   |    7 +++
 fs/xfs/libxfs/xfs_rmap.c       |   21 ++++++++++
 fs/xfs/libxfs/xfs_rmap.h       |    7 +++
 fs/xfs/xfs_bmap_item.c         |    4 +-
 fs/xfs/xfs_extfree_item.c      |   19 ++++++---
 fs/xfs/xfs_refcount_item.c     |    4 +-
 fs/xfs/xfs_reflink.c           |    2 -
 fs/xfs/xfs_rmap_item.c         |    4 +-
 fs/xfs/xfs_super.c             |   21 +++++-----
 19 files changed, 302 insertions(+), 140 deletions(-)