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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_m...size_params(3) liburing Manual io_uring_m...size_params(3)
io_uring_memory_size_params - get memory size needed for a ring
with params
#include <liburing.h>
ssize_t io_uring_memory_size_params(unsigned entries, struct io_uring_params *p);
The io_uring_memory_size_params(3) function returns the total
memory size needed for an io_uring ring with entries entries and
the parameters specified in p.
This is useful for applications that want to pre-allocate memory
for a ring or want to know the memory footprint before creating a
ring.
This function provides more control than io_uring_memory_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 memory size in bytes on success, or a
negative errno value on error.
-EINVAL
Invalid entries value (0 or too large without
IORING_SETUP_CLAMP).
io_uring_memory_size(3), io_uring_mlock_size_params(3),
io_uring_queue_init_params(3)
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-2.11 January 18, 2025 io_uring_m...size_params(3)
Pages that refer to this page: io_uring_memory_size_params(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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