134 строки
3.5 KiB
C
134 строки
3.5 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/mm.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/backing-dev.h>
|
|
#include "kmem.h"
|
|
#include "xfs_message.h"
|
|
|
|
/*
|
|
* Greedy allocation. May fail and may return vmalloced memory.
|
|
*/
|
|
void *
|
|
kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
|
|
{
|
|
void *ptr;
|
|
size_t kmsize = maxsize;
|
|
|
|
while (!(ptr = vzalloc(kmsize))) {
|
|
if ((kmsize >>= 1) <= minsize)
|
|
kmsize = minsize;
|
|
}
|
|
if (ptr)
|
|
*size = kmsize;
|
|
return ptr;
|
|
}
|
|
|
|
void *
|
|
kmem_alloc(size_t size, xfs_km_flags_t flags)
|
|
{
|
|
int retries = 0;
|
|
gfp_t lflags = kmem_flags_convert(flags);
|
|
void *ptr;
|
|
|
|
do {
|
|
ptr = kmalloc(size, lflags);
|
|
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
|
|
return ptr;
|
|
if (!(++retries % 100))
|
|
xfs_err(NULL,
|
|
"%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)",
|
|
current->comm, current->pid,
|
|
(unsigned int)size, __func__, lflags);
|
|
congestion_wait(BLK_RW_ASYNC, HZ/50);
|
|
} while (1);
|
|
}
|
|
|
|
void *
|
|
kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
|
|
{
|
|
unsigned noio_flag = 0;
|
|
void *ptr;
|
|
gfp_t lflags;
|
|
|
|
ptr = kmem_zalloc(size, flags | KM_MAYFAIL);
|
|
if (ptr)
|
|
return ptr;
|
|
|
|
/*
|
|
* __vmalloc() will allocate data pages and auxillary structures (e.g.
|
|
* pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context
|
|
* here. Hence we need to tell memory reclaim that we are in such a
|
|
* context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering
|
|
* the filesystem here and potentially deadlocking.
|
|
*/
|
|
if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
|
|
noio_flag = memalloc_noio_save();
|
|
|
|
lflags = kmem_flags_convert(flags);
|
|
ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
|
|
|
|
if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
|
|
memalloc_noio_restore(noio_flag);
|
|
|
|
return ptr;
|
|
}
|
|
|
|
void *
|
|
kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags)
|
|
{
|
|
int retries = 0;
|
|
gfp_t lflags = kmem_flags_convert(flags);
|
|
void *ptr;
|
|
|
|
do {
|
|
ptr = krealloc(old, newsize, lflags);
|
|
if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
|
|
return ptr;
|
|
if (!(++retries % 100))
|
|
xfs_err(NULL,
|
|
"%s(%u) possible memory allocation deadlock size %zu in %s (mode:0x%x)",
|
|
current->comm, current->pid,
|
|
newsize, __func__, lflags);
|
|
congestion_wait(BLK_RW_ASYNC, HZ/50);
|
|
} while (1);
|
|
}
|
|
|
|
void *
|
|
kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t 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))
|
|
xfs_err(NULL,
|
|
"%s(%u) possible memory allocation deadlock in %s (mode:0x%x)",
|
|
current->comm, current->pid,
|
|
__func__, lflags);
|
|
congestion_wait(BLK_RW_ASYNC, HZ/50);
|
|
} while (1);
|
|
}
|