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80 lines
2.5 KiB
80 lines
2.5 KiB
5 months ago
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/* Copyright (c) 2004, 2019, Oracle and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file mysys/my_largepage.cc
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "my_loglevel.h"
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#include "my_sys.h"
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#include "mysql/psi/mysql_file.h"
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#include "mysys/mysys_priv.h"
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#include "mysys_err.h"
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static uint my_get_large_page_size_int(void);
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/* Gets the size of large pages from the OS */
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uint my_get_large_page_size(void) {
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uint size;
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DBUG_TRACE;
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if (!(size = my_get_large_page_size_int()))
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my_message_local(
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WARNING_LEVEL,
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EE_FAILED_TO_DETERMINE_LARGE_PAGE_SIZE); /* purecov: inspected */
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return size;
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}
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/* Linux-specific function to determine the size of large pages */
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uint my_get_large_page_size_int(void) {
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MYSQL_FILE *f;
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uint size = 0;
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char buf[256];
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DBUG_TRACE;
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if (!(f = mysql_file_fopen(key_file_proc_meminfo, "/proc/meminfo", O_RDONLY,
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MYF(MY_WME))))
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goto finish;
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while (mysql_file_fgets(buf, sizeof(buf), f))
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if (sscanf(buf, "Hugepagesize: %u kB", &size)) break;
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mysql_file_fclose(f, MYF(MY_WME));
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finish:
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return size * 1024;
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}
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