mirror of
https://github.com/MariaDB/server.git
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6acada713a
When using the default innodb_log_buffer_size=2m, mariadb-backup --backup
would spend a lot of time re-reading and re-parsing the log. For reads,
it would be beneficial to memory-map the entire ib_logfile0 to the
address space (typically 48 bits or 256 TiB) and read it from there,
both during --backup and --prepare.
We will introduce the Boolean read-only parameter innodb_log_file_mmap
that will be OFF by default on most platforms, to avoid aggressive
read-ahead of the entire ib_logfile0 in when only a tiny portion would be
accessed. On Linux and FreeBSD the default is innodb_log_file_mmap=ON,
because those platforms define a specific mmap(2) option for enabling
such read-ahead and therefore it can be assumed that the default would
be on-demand paging. This parameter will only have impact on the initial
InnoDB startup and recovery. Any writes to the log will use regular I/O,
except when the ib_logfile0 is stored in a specially configured file system
that is backed by persistent memory (Linux "mount -o dax").
We also experimented with allowing writes of the ib_logfile0 via a
memory mapping and decided against it. A fundamental problem would be
unnecessary read-before-write in case of a major page fault, that is,
when a new, not yet cached, virtual memory page in the circular
ib_logfile0 is being written to. There appears to be no way to tell
the operating system that we do not care about the previous contents of
the page, or that the page fault handler should just zero it out.
Many references to HAVE_PMEM have been replaced with references to
HAVE_INNODB_MMAP.
The predicate log_sys.is_pmem() has been replaced with
log_sys.is_mmap() && !log_sys.is_opened().
Memory-mapped regular files differ from MAP_SYNC (PMEM) mappings in the
way that an open file handle to ib_logfile0 will be retained. In both
code paths, log_sys.is_mmap() will hold. Holding a file handle open will
allow log_t::clear_mmap() to disable the interface with fewer operations.
It should be noted that ever since
commit 685d958e38 (MDEV-14425)
most 64-bit Linux platforms on our CI platforms
(s390x a.k.a. IBM System Z being a notable exception) read and write
/dev/shm/*/ib_logfile0 via a memory mapping, pretending that it is
persistent memory (mount -o dax). So, the memory mapping based log
parsing that this change is enabling by default on Linux and FreeBSD
has already been extensively tested on Linux.
::log_mmap(): If a log cannot be opened as PMEM and the desired access
is read-only, try to open a read-only memory mapping.
xtrabackup_copy_mmap_snippet(), xtrabackup_copy_mmap_logfile():
Copy the InnoDB log in mariadb-backup --backup from a memory
mapped file.
351 lines
14 KiB
CMake
351 lines
14 KiB
CMake
# Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
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#
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# This program is free software; you can redistribute it and/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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#
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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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#
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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 St, Fifth Floor, Boston, MA 02110-1335 USA
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# Avoid system checks on Windows by pre-caching results. Most of the system checks
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# are not relevant for Windows anyway and it takes lot more time to run them,
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# since CMake to creates a Visual Studio project for each tiny test.
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# Note that only we cache values on VC++ only, MinGW would give slightly
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# different results.
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SET(HAVE_MALLOC_USABLE_SIZE CACHE INTERNAL "")
|
|
SET(HAVE_PAM_EXT_H CACHE INTERNAL "")
|
|
SET(HAVE_PAM_SYSLOG CACHE INTERNAL "")
|
|
SET(HAVE_XUCRED CACHE INTERNAL "")
|
|
SET(HAVE_GETPEERUCRED CACHE INTERNAL "")
|
|
SET(HAVE_GETPWUID_POSIX_FINAL CACHE INTERNAL "")
|
|
SET(HAVE_CRACK_H CACHE INTERNAL "")
|
|
SET(HAVE_LIBCRACK CACHE INTERNAL "")
|
|
SET(HAVE_SNAPPY_SHARED_LIB INTERNAL "")
|
|
SET(HAVE_LZ4_SHARED_LIB INTERNAL "")
|
|
SET(HAVE_SYS_POLL_H CACHE INTERNAL "")
|
|
SET(HAVE_SYS_SYSCALL_H CACHE INTERNAL "")
|
|
SET(HAVE_SYS_STATVFS_H CACHE INTERNAL "")
|
|
SET(HAVE_GETPAGESIZES CACHE INTERNAL "")
|
|
SET(HAVE_LINUX_LIMITS_H CACHE INTERNAL "")
|
|
SET(HAVE_FILE_UCONTEXT_H CACHE INTERNAL "")
|
|
ENDIF(MSVC)
|