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jolly uploaded patch set #4 to this change.

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Allow io_uring_submit batching just ahead of poll/select

Let's add a mode (enabled via the LIBOSMO_IO_URING_BATCH environment
variable), where we don't call io_uring_submit() after every operation
we add to the submission queue.  Rather, do that once before we go into
poll.

This should massively reduce the amount of io_uring_enter() syscalls
we're seeing.

Related: OS#6705
Change-Id: Id34fe2ced32c63d15b14810e145744f7509064cc
---
M src/core/osmo_io_uring.c
M src/core/select.c
2 files changed, 36 insertions(+), 4 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/89/40489/4

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