[PATCH v2 0/3] optimise ctx's refs grabbing in io_uring

[Pavel Begunkov]

Optimise percpu_ref_tryget() by not calling it for each request, but
batching it. This gave a measurable ~5% performance boost for large QD.

v2: fix uncommited plug (Jens Axboe)
    better comments for percpu_ref_tryget_many (Dennis Zhou)
    amortise across io_uring_enter() boundary

Pavel Begunkov (3):
  pcpu_ref: add percpu_ref_tryget_many()
  io_uring: batch getting pcpu references
  io_uring: batch get(ctx->ref) across submits

 fs/io_uring.c                   | 29 ++++++++++++++++++++++++++---
 include/linux/percpu-refcount.h | 26 +++++++++++++++++++++-----
 2 files changed, 47 insertions(+), 8 deletions(-)

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2.24.0