[PATCH 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 performance boost, though with
a bit unconventional(/unrealistic?) workload.

There is still one step to add, which is not implemented with
patchset, and will amortise the effect calls to io_uring_enter().

rebased on top of for-5.6/io_uring

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

 fs/io_uring.c                   | 11 ++++++++---
 include/linux/percpu-refcount.h | 24 ++++++++++++++++++++----
 2 files changed, 28 insertions(+), 7 deletions(-)

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2.24.0