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2293567c8c
Add --config for overriding most config file settings from cmdline. Quote arguments when printing command line. Remove linefeed from 'initialising logging' message. Add 'Completed' debug message. Don't attempt library exit after reloading config files. Always compile with libdevmapper, even if device-mapper is disabled.
159 lines
3.4 KiB
C
159 lines
3.4 KiB
C
/*
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* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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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 Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "memlock.h"
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#include "defaults.h"
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#include "config.h"
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#include "toolcontext.h"
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#include <limits.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#ifndef DEVMAPPER_SUPPORT
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void memlock_inc(void)
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{
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return;
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}
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void memlock_dec(void)
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{
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return;
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}
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int memlock(void)
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{
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return 0;
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}
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void memlock_init(struct cmd_context *cmd)
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{
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return;
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}
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#else /* DEVMAPPER_SUPPORT */
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static size_t _size_stack;
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static size_t _size_malloc_tmp;
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static size_t _size_malloc = 2000000;
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static void *_malloc_mem = NULL;
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static int _memlock_count = 0;
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static int _priority;
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static int _default_priority;
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static void _touch_memory(void *mem, size_t size)
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{
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size_t pagesize = getpagesize();
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void *pos = mem;
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void *end = mem + size - sizeof(long);
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while (pos < end) {
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*(long *) pos = 1;
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pos += pagesize;
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}
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}
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static void _allocate_memory(void)
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{
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void *stack_mem, *temp_malloc_mem;
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if ((stack_mem = alloca(_size_stack)))
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_touch_memory(stack_mem, _size_stack);
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if ((temp_malloc_mem = malloc(_size_malloc_tmp)))
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_touch_memory(temp_malloc_mem, _size_malloc_tmp);
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if ((_malloc_mem = malloc(_size_malloc)))
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_touch_memory(_malloc_mem, _size_malloc);
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free(temp_malloc_mem);
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}
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static void _release_memory(void)
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{
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free(_malloc_mem);
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}
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/* Stop memory getting swapped out */
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static void _lock_mem(void)
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{
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#ifdef MCL_CURRENT
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if (mlockall(MCL_CURRENT | MCL_FUTURE))
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log_sys_error("mlockall", "");
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else
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log_very_verbose("Locking memory");
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#endif
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_allocate_memory();
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errno = 0;
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if (((_priority = getpriority(PRIO_PROCESS, 0)) == -1) && errno)
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log_sys_error("getpriority", "");
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else
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if (setpriority(PRIO_PROCESS, 0, _default_priority))
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log_error("setpriority %u failed: %s",
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_default_priority, strerror(errno));
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}
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static void _unlock_mem(void)
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{
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#ifdef MCL_CURRENT
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if (munlockall())
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log_sys_error("munlockall", "");
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else
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log_very_verbose("Unlocking memory");
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#endif
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_release_memory();
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if (setpriority(PRIO_PROCESS, 0, _priority))
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log_error("setpriority %u failed: %s", _priority,
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strerror(errno));
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}
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void memlock_inc(void)
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{
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if (!_memlock_count++)
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_lock_mem();
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log_debug("memlock_count inc to %d", _memlock_count);
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}
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void memlock_dec(void)
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{
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if (_memlock_count && (!--_memlock_count))
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_unlock_mem();
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log_debug("memlock_count dec to %d", _memlock_count);
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}
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int memlock(void)
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{
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return _memlock_count;
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}
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void memlock_init(struct cmd_context *cmd)
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{
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_size_stack = find_config_tree_int(cmd,
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"activation/reserved_stack",
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DEFAULT_RESERVED_STACK) * 1024;
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_size_malloc_tmp = find_config_tree_int(cmd,
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"activation/reserved_memory",
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DEFAULT_RESERVED_MEMORY) * 1024;
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_default_priority = find_config_tree_int(cmd,
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"activation/process_priority",
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DEFAULT_PROCESS_PRIORITY);
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}
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#endif
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