[PATCH v4 0/2] 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

v3: drop "batching across syscalls"
    remove error handling in io_submit_sqes() from common path

v4: fix error handling

Pavel Begunkov (2):
  pcpu_ref: add percpu_ref_tryget_many()
  io_uring: batch getting pcpu references

 fs/io_uring.c                   | 26 +++++++++++++++++---------
 include/linux/percpu-refcount.h | 26 +++++++++++++++++++++-----
 2 files changed, 38 insertions(+), 14 deletions(-)

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2.24.0