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/*
* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "memlock.h"
#include "defaults.h"
#include "config.h"
#include "toolcontext.h"
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/resource.h>
#ifndef DEVMAPPER_SUPPORT
void memlock_inc(void)
{
return;
}
void memlock_dec(void)
{
return;
}
int memlock(void)
{
return 0;
}
void memlock_init(struct cmd_context *cmd)
{
return;
}
#else /* DEVMAPPER_SUPPORT */
static size_t _size_stack;
static size_t _size_malloc_tmp;
static size_t _size_malloc = 2000000;
static void *_malloc_mem = NULL;
static int _memlock_count = 0;
static int _priority;
static int _default_priority;
static void _touch_memory(void *mem, size_t size)
{
size_t pagesize = lvm_getpagesize();
void *pos = mem;
void *end = mem + size - sizeof(long);
while (pos < end) {
*(long *) pos = 1;
pos += pagesize;
}
}
static void _allocate_memory(void)
{
void *stack_mem, *temp_malloc_mem;
if ((stack_mem = alloca(_size_stack)))
_touch_memory(stack_mem, _size_stack);
if ((temp_malloc_mem = malloc(_size_malloc_tmp)))
_touch_memory(temp_malloc_mem, _size_malloc_tmp);
if ((_malloc_mem = malloc(_size_malloc)))
_touch_memory(_malloc_mem, _size_malloc);
free(temp_malloc_mem);
}
static void _release_memory(void)
{
free(_malloc_mem);
}
/* Stop memory getting swapped out */
static void _lock_mem(void)
{
#ifdef MCL_CURRENT
if (mlockall(MCL_CURRENT | MCL_FUTURE))
log_sys_error("mlockall", "");
else
log_very_verbose("Locking memory");
#endif
_allocate_memory();
errno = 0;
if (((_priority = getpriority(PRIO_PROCESS, 0)) == -1) && errno)
log_sys_error("getpriority", "");
else
if (setpriority(PRIO_PROCESS, 0, _default_priority))
log_error("setpriority %u failed: %s",
_default_priority, strerror(errno));
}
static void _unlock_mem(void)
{
#ifdef MCL_CURRENT
if (munlockall())
log_sys_error("munlockall", "");
else
log_very_verbose("Unlocking memory");
#endif
_release_memory();
if (setpriority(PRIO_PROCESS, 0, _priority))
log_error("setpriority %u failed: %s", _priority,
strerror(errno));
}
void memlock_inc(void)
{
if (!_memlock_count++)
_lock_mem();
log_debug("memlock_count inc to %d", _memlock_count);
}
void memlock_dec(void)
{
if (_memlock_count && (!--_memlock_count))
_unlock_mem();
log_debug("memlock_count dec to %d", _memlock_count);
}
int memlock(void)
{
return _memlock_count;
}
void memlock_init(struct cmd_context *cmd)
{
_size_stack = find_config_tree_int(cmd,
"activation/reserved_stack",
DEFAULT_RESERVED_STACK) * 1024;
_size_malloc_tmp = find_config_tree_int(cmd,
"activation/reserved_memory",
DEFAULT_RESERVED_MEMORY) * 1024;
_default_priority = find_config_tree_int(cmd,
"activation/process_priority",
DEFAULT_PROCESS_PRIORITY);
}
#endif
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