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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include "time.h"
#include "kmem.h"
#define MAX_VMALLOCS 6
#define MAX_SLAB_SIZE 0x20000
void *
kmem_alloc(size_t size, unsigned int __nocast flags)
{
int retries = 0;
gfp_t lflags = kmem_flags_convert(flags);
void *ptr;
#ifdef DEBUG
if (unlikely(!(flags & KM_LARGE) && (size > PAGE_SIZE))) {
printk(KERN_WARNING "Large %s attempt, size=%ld\n",
__FUNCTION__, (long)size);
dump_stack();
}
#endif
do {
if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
ptr = kmalloc(size, lflags);
else
ptr = __vmalloc(size, lflags, PAGE_KERNEL);
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
return ptr;
if (!(++retries % 100))
printk(KERN_ERR "XFS: possible memory allocation "
"deadlock in %s (mode:0x%x)\n",
__FUNCTION__, lflags);
congestion_wait(WRITE, HZ/50);
} while (1);
}
void *
kmem_zalloc(size_t size, unsigned int __nocast flags)
{
void *ptr;
ptr = kmem_alloc(size, flags);
if (ptr)
memset((char *)ptr, 0, (int)size);
return ptr;
}
void *
kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize,
unsigned int __nocast flags)
{
void *ptr;
size_t kmsize = maxsize;
unsigned int kmflags = (flags & ~KM_SLEEP) | KM_NOSLEEP;
while (!(ptr = kmem_zalloc(kmsize, kmflags))) {
if ((kmsize <= minsize) && (flags & KM_NOSLEEP))
break;
if ((kmsize >>= 1) <= minsize) {
kmsize = minsize;
kmflags = flags;
}
}
if (ptr)
*size = kmsize;
return ptr;
}
void
kmem_free(void *ptr, size_t size)
{
if (((unsigned long)ptr < VMALLOC_START) ||
((unsigned long)ptr >= VMALLOC_END)) {
kfree(ptr);
} else {
vfree(ptr);
}
}
void *
kmem_realloc(void *ptr, size_t newsize, size_t oldsize,
unsigned int __nocast flags)
{
void *new;
new = kmem_alloc(newsize, flags);
if (ptr) {
if (new)
memcpy(new, ptr,
((oldsize < newsize) ? oldsize : newsize));
kmem_free(ptr, oldsize);
}
return new;
}
void *
kmem_zone_alloc(kmem_zone_t *zone, unsigned int __nocast flags)
{
int retries = 0;
gfp_t lflags = kmem_flags_convert(flags);
void *ptr;
do {
ptr = kmem_cache_alloc(zone, lflags);
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
return ptr;
if (!(++retries % 100))
printk(KERN_ERR "XFS: possible memory allocation "
"deadlock in %s (mode:0x%x)\n",
__FUNCTION__, lflags);
congestion_wait(WRITE, HZ/50);
} while (1);
}
void *
kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags)
{
void *ptr;
ptr = kmem_zone_alloc(zone, flags);
if (ptr)
memset((char *)ptr, 0, kmem_cache_size(zone));
return ptr;
}
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