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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_ml...size_params(3) liburing Manual io_uring_ml...size_params(3)
io_uring_mlock_size_params - get required memlock size for a ring
with params
#include <liburing.h>
ssize_t io_uring_mlock_size_params(unsigned entries, struct io_uring_params *p);
The io_uring_mlock_size_params(3) function returns the required
RLIMIT_MEMLOCK memory size for an io_uring ring with entries
entries and the parameters specified in p.
On newer kernels (5.12+), io_uring no longer requires any memlock
memory and this function will return 0. On older kernels (5.11 and
prior), this returns the required memory so that the caller can
ensure that enough RLIMIT_MEMLOCK space is available before
setting up a ring.
This function provides more control than io_uring_mlock_size(3) by
allowing the caller to specify full ring parameters including CQ
size via p->cq_entries when IORING_SETUP_CQSIZE is set in
p->flags.
Returns the required memlock size in bytes on success, 0 if no
memlock is needed, or a negative errno value on error.
io_uring_mlock_size(3), io_uring_memory_size_params(3),
io_uring_queue_init_params(3), getrlimit(2)
This page is part of the liburing (A library for io_uring)
project. Information about the project can be found at
⟨https://github.com/axboe/liburing⟩. If you have a bug report for
this manual page, send it to io-uring@vger.kernel.org. This page
was obtained from the project's upstream Git repository
⟨https://github.com/axboe/liburing⟩ on 2026-05-24. (At that time,
the date of the most recent commit that was found in the
repository was 2026-05-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
liburing-2.4 January 18, 2025io_uring_ml...size_params(3)
Pages that refer to this page: io_uring_memory_size_params(3), io_uring_mlock_size(3), io_uring_mlock_size_params(3)
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HTML rendering created 2026-05-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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