130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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 the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include "kmem.h"
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#include "xfs_message.h"
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/*
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* Greedy allocation. May fail and may return vmalloced memory.
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*/
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void *
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kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
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{
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void *ptr;
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size_t kmsize = maxsize;
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while (!(ptr = vzalloc(kmsize))) {
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if ((kmsize >>= 1) <= minsize)
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kmsize = minsize;
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}
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if (ptr)
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*size = kmsize;
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return ptr;
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}
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void *
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kmem_alloc(size_t size, xfs_km_flags_t flags)
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{
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int retries = 0;
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gfp_t lflags = kmem_flags_convert(flags);
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void *ptr;
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do {
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ptr = kmalloc(size, lflags);
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if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
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return ptr;
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if (!(++retries % 100))
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xfs_err(NULL,
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"%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)",
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current->comm, current->pid,
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(unsigned int)size, __func__, lflags);
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congestion_wait(BLK_RW_ASYNC, HZ/50);
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} while (1);
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}
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void *
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kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
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{
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unsigned noio_flag = 0;
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void *ptr;
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gfp_t lflags;
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ptr = kmem_zalloc(size, flags | KM_MAYFAIL);
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if (ptr)
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return ptr;
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/*
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* __vmalloc() will allocate data pages and auxillary structures (e.g.
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* pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context
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* here. Hence we need to tell memory reclaim that we are in such a
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* context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering
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* the filesystem here and potentially deadlocking.
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*/
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if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
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noio_flag = memalloc_noio_save();
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lflags = kmem_flags_convert(flags);
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ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
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if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
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memalloc_noio_restore(noio_flag);
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return ptr;
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}
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void *
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kmem_realloc(const void *ptr, size_t newsize, size_t oldsize,
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xfs_km_flags_t flags)
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{
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void *new;
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new = kmem_alloc(newsize, flags);
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if (ptr) {
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if (new)
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memcpy(new, ptr,
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((oldsize < newsize) ? oldsize : newsize));
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kmem_free(ptr);
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}
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return new;
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}
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void *
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kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
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{
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int retries = 0;
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gfp_t lflags = kmem_flags_convert(flags);
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void *ptr;
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do {
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ptr = kmem_cache_alloc(zone, lflags);
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if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
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return ptr;
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if (!(++retries % 100))
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xfs_err(NULL,
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"%s(%u) possible memory allocation deadlock in %s (mode:0x%x)",
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current->comm, current->pid,
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__func__, lflags);
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congestion_wait(BLK_RW_ASYNC, HZ/50);
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} while (1);
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}
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