diff options
| 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 /configure.ac | |
| 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 'configure.ac')
| -rw-r--r-- | configure.ac | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index b3efc49c97a..c2877e36935 100644 --- a/configure.ac +++ b/configure.ac @@ -1420,6 +1420,13 @@ if test "$with_libxslt" = yes ; then AC_CHECK_LIB(xslt, xsltCleanupGlobals, [], [AC_MSG_ERROR([library 'xslt' is required for XSLT support])]) fi +if test "$with_liburing" = yes; then + _LIBS="$LIBS" + LIBS="$LIBURING_LIBS $LIBS" + AC_CHECK_FUNCS([io_uring_queue_init_mem]) + LIBS="$_LIBS" +fi + if test "$with_lz4" = yes ; then AC_CHECK_LIB(lz4, LZ4_compress_default, [], [AC_MSG_ERROR([library 'lz4' is required for LZ4 support])]) fi |