[PATCH 0/9] Clean up alloc_cache allocations

[Gabriel Krisman Bertazi <krisman@suse.de>]

Jens, Pavel,

The allocation paths that use alloc_cache duplicate the same code
pattern, sometimes in a quite convoluted way.  This series cleans up
that code by folding the allocation into the cache code itself, making
it just an allocator function, and keeping the cache policy invisible to
callers.  A bigger justification for doing this, beyond code simplicity,
is that it makes it trivial to test the impact of disabling the cache
and using slab directly, which I've used for slab improvement
experiments.  I think this is one step forward in the direction
eventually lifting the alloc_cache into a proper magazine layer in slab
out of io_uring.

It survived liburing testsuite, and when microbenchmarking the
read-write path with mmtests and fio, I didn't observe any significant
performance variation (there was actually a 2% gain, but that was
within the variance of the test runs, making it not signficant and
surely test noise).

I'm specifically interested, and happy to do so, if there are specific
benchmarks you'd like me to run it against.

Thanks,

Gabriel Krisman Bertazi (9):
  io_uring: Fold allocation into alloc_cache helper
  io_uring: Add generic helper to allocate async data
  io_uring/futex: Allocate ifd with generic alloc_cache helper
  io_uring/poll: Allocate apoll with generic alloc_cache helper
  io_uring/uring_cmd: Allocate async data through generic helper
  io_uring/net: Allocate msghdr async data through helper
  io_uring/rw: Allocate async data through helper
  io_uring: Move old async data allocation helper to header
  io_uring/msg_ring: Drop custom destructor

 io_uring/alloc_cache.h |  7 +++++++
 io_uring/futex.c       | 13 +------------
 io_uring/io_uring.c    | 17 ++---------------
 io_uring/io_uring.h    | 22 ++++++++++++++++++++++
 io_uring/msg_ring.c    |  7 -------
 io_uring/msg_ring.h    |  1 -
 io_uring/net.c         | 28 ++++++++++------------------
 io_uring/poll.c        | 13 +++++--------
 io_uring/rw.c          | 28 ++++++++--------------------
 io_uring/timeout.c     |  5 ++---
 io_uring/uring_cmd.c   | 20 ++------------------
 io_uring/waitid.c      |  4 ++--
 12 files changed, 61 insertions(+), 104 deletions(-)

-- 
2.47.0