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a87bb96ecb
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.
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/* Copyright (C) 2025 MariaDB Corporation.
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This program is free software; you can redistribute itand /or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 - 1301 USA*/
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/*
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This file exports create_linux_aio() function which is used to create
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an asynchronous IO implementation for Linux (currently either libaio or
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uring).
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*/
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#include "tpool.h"
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#include <stdio.h>
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namespace tpool
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{
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// Forward declarations of aio implementations
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#ifdef HAVE_LIBAIO
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// defined in aio_libaio.cc
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aio *create_libaio(thread_pool *pool, int max_io);
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#endif
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#if defined HAVE_URING
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// defined in aio_uring.cc
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aio *create_uring(thread_pool *pool, int max_io);
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#endif
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/*
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@brief
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Choose native linux aio implementation based on availability and user
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preference.
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@param pool - thread pool to use for aio operations
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@param max_io - maximum number of concurrent io operations
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@param impl - implementation to use, can be one of the following:
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@returns
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A pointer to the aio implementation object, or nullptr if no suitable
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implementation is available.
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If impl is OS_IO_DEFAULT, it will try uring first, fallback to libaio
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If impl is OS_IO_URING or OS_IO_LIBAIO, it won't fallback
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*/
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aio *create_linux_aio(thread_pool *pool, int max_io, aio_implementation impl)
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{
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#ifdef HAVE_URING
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if (impl != OS_IO_LIBAIO)
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{
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aio *ret= create_uring(pool, max_io);
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if (ret)
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return ret;
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else if (impl != OS_IO_DEFAULT)
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return nullptr; // uring is not available
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else
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fprintf(stderr, "create_uring failed: falling back to libaio\n");
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}
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#endif
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#ifdef HAVE_LIBAIO
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if (impl != OS_IO_URING)
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return create_libaio(pool, max_io);
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#endif
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return nullptr;
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}
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} // namespace tpool
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