[PATCH v3 0/2] optimise ctx's refs grabbing in io_uring

Pavel Begunkov
2019-12-21T20:13:28Z

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

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

fs/io_uring.c | 14 ++++++++++----
include/linux/percpu-refcount.h | 26 +++++++++++++++++++++-----
2 files changed, 31 insertions(+), 9 deletions(-)

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2.24.0