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MDEV-36234: Add innodb_linux_aio

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This controls which linux implementation to use for
innodb_use_native_aio=ON.

innodb_linux_aio=auto is equivalent to innodb_linux_aio=io_uring when
it is available, and falling back to innodb_linux_aio=aio when not.

Debian packaging is no longer aio exclusive or uring, so
for those older Debian or Ubuntu releases, its a remove_uring directive.
For more recent releases, add mandatory liburing for consistent packaging.

WITH_LIBAIO is now an independent option from WITH_URING.

LINUX_NATIVE_AIO preprocessor constant is renamed to HAVE_LIBAIO,
analogous to existing HAVE_URING.

tpool::is_aio_supported(): A common feature check.

is_linux_native_aio_supported(): Remove. This had originally been added in
mysql/mysql-server@0da310b69d in 2012
to fix an issue where io_submit() on CentOS 5.5 would return EINVAL
for a /tmp/#sql*.ibd file associated with CREATE TEMPORARY TABLE.
But, starting with commit 2e814d4702 InnoDB
temporary tables will be written to innodb_temp_data_file_path.
The 2012 commit said that the error could occur on "old kernels".
Any GNU/Linux distribution that we currently support should be based
on a newer Linux kernel; for example, Red Hat Enterprise Linux 7
was released in 2014.

tpool::create_linux_aio(): Wraps the Linux implementations:
create_libaio() and create_liburing(), each defined in separate
compilation units (aio_linux.cc, aio_libaio.cc, aio_liburing.cc).

The CMake definitions are simplified using target_sources() and
target_compile_definitions(), all available since CMake 2.8.12.
With this change, there is no need to include ${CMAKE_SOURCE_DIR}/tpool
or add TPOOL_DEFINES flags anymore, target_link_libraries(lib tpool)
does all that.

This is joint work with Daniel Black and Vladislav Vaintroub.
This commit is contained in:
Marko Mäkelä
2025-06-23 13:51:52 +03:00
parent 107d1ef2c0
commit a87bb96ecb
29 changed files with 516 additions and 457 deletions
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21
mysql-test/suite/sys_vars/r/innodb_linux_aio_basic.result Normal file
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select @@global.innodb_linux_aio;
@@global.innodb_linux_aio
auto
select @@session.innodb_linux_aio;
ERROR HY000: Variable 'innodb_linux_aio' is a GLOBAL variable
show global variables like 'innodb_linux_aio';
Variable_name Value
innodb_linux_aio auto
show session variables like 'innodb_linux_aio';
Variable_name Value
innodb_linux_aio auto
select * from information_schema.global_variables where variable_name='innodb_linux_aio';
VARIABLE_NAME VARIABLE_VALUE
INNODB_LINUX_AIO auto
select * from information_schema.session_variables where variable_name='innodb_linux_aio';
VARIABLE_NAME VARIABLE_VALUE
INNODB_LINUX_AIO auto
set global innodb_linux_aio='auto';
ERROR HY000: Variable 'innodb_linux_aio' is a read only variable
set session innodb_linux_aio='aio';
ERROR HY000: Variable 'innodb_linux_aio' is a read only variable