6216ff1883
kmem_zalloc_greedy() SGI-PV: 956240 SGI-Modid: xfs-linux-melb:xfs-kern:26983a Signed-off-by: Vlad Apostolov <vapo@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
/*
|
|
* 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/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/blkdev.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);
|
|
blk_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);
|
|
blk_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;
|
|
}
|