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| author | Andres Freund | 2025-07-08 01:03:16 +0000 |
|---|---|---|
| committer | Andres Freund | 2025-07-08 02:57:07 +0000 |
| commit | f54af9f2679d5987b4680e742ac9bd585260e620 (patch) | |
| tree | f53671d9d66b881087541054594405fe3c211bb3 /meson.build | |
| parent | 55a780e9476a753354a6db887e92125c7886ca6d (diff) | |
aio: Combine io_uring memory mappings, if supported
By default io_uring creates a shared memory mapping for each io_uring
instance, leading to a large number of memory mappings. Unfortunately a large
number of memory mappings slows things down, backend exit is particularly
affected. To address that, newer kernels (6.5) support using user-provided
memory for the memory. By putting the relevant memory into shared memory we
don't need any additional mappings.
On a system with a new enough kernel and liburing, there is no discernible
overhead when doing a pgbench -S -C anymore.
Reported-by: MARK CALLAGHAN <mdcallag@gmail.com>
Reviewed-by: "Burd, Greg" <greg@burd.me>
Reviewed-by: Jim Nasby <jnasby@upgrade.com>
Discussion: https://postgr.es/m/CAFbpF8OA44_UG+RYJcWH9WjF7E3GA6gka3gvH6nsrSnEe9H0NA@mail.gmail.com
Backpatch-through: 18
Diffstat (limited to 'meson.build')
| -rw-r--r-- | meson.build | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/meson.build b/meson.build index f5b937de60..5365aaf95e 100644 --- a/meson.build +++ b/meson.build @@ -995,6 +995,12 @@ liburingopt = get_option('liburing') liburing = dependency('liburing', required: liburingopt) if liburing.found() cdata.set('USE_LIBURING', 1) + + if cc.has_function('io_uring_queue_init_mem', + dependencies: liburing, args: test_c_args) + cdata.set('HAVE_LIBURING_QUEUE_INIT_MEM', 1) + endif + endif |