3fcfab16c5
Separate out the concept of "queue congestion" from "backing-dev congestion". Congestion is a backing-dev concept, not a queue concept. The blk_* congestion functions are retained, as wrappers around the core backing-dev congestion functions. This proper layering is needed so that NFS can cleanly use the congestion functions, and so that CONFIG_BLOCK=n actually links. Cc: "Thomas Maier" <balagi@justmail.de> Cc: "Jens Axboe" <jens.axboe@oracle.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: David Howells <dhowells@redhat.com> Cc: Peter Osterlund <petero2@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
149 lines
3.4 KiB
C
149 lines
3.4 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/sched.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/highmem.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 "time.h"
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#include "kmem.h"
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#define MAX_VMALLOCS 6
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#define MAX_SLAB_SIZE 0x20000
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void *
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kmem_alloc(size_t size, unsigned int __nocast 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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#ifdef DEBUG
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if (unlikely(!(flags & KM_LARGE) && (size > PAGE_SIZE))) {
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printk(KERN_WARNING "Large %s attempt, size=%ld\n",
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__FUNCTION__, (long)size);
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dump_stack();
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}
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#endif
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do {
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if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
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ptr = kmalloc(size, lflags);
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else
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ptr = __vmalloc(size, lflags, PAGE_KERNEL);
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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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printk(KERN_ERR "XFS: possible memory allocation "
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"deadlock in %s (mode:0x%x)\n",
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__FUNCTION__, lflags);
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congestion_wait(WRITE, HZ/50);
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} while (1);
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}
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void *
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kmem_zalloc(size_t size, unsigned int __nocast flags)
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{
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void *ptr;
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ptr = kmem_alloc(size, flags);
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if (ptr)
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memset((char *)ptr, 0, (int)size);
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return ptr;
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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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unsigned int __nocast flags)
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{
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void *ptr;
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size_t kmsize = maxsize;
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unsigned int kmflags = (flags & ~KM_SLEEP) | KM_NOSLEEP;
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while (!(ptr = kmem_zalloc(kmsize, kmflags))) {
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if ((kmsize <= minsize) && (flags & KM_NOSLEEP))
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break;
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if ((kmsize >>= 1) <= minsize) {
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kmsize = minsize;
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kmflags = flags;
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}
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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_free(void *ptr, size_t size)
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{
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if (((unsigned long)ptr < VMALLOC_START) ||
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((unsigned long)ptr >= VMALLOC_END)) {
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kfree(ptr);
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} else {
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vfree(ptr);
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}
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}
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void *
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kmem_realloc(void *ptr, size_t newsize, size_t oldsize,
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unsigned int __nocast 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, oldsize);
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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, unsigned int __nocast 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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printk(KERN_ERR "XFS: possible memory allocation "
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"deadlock in %s (mode:0x%x)\n",
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__FUNCTION__, lflags);
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congestion_wait(WRITE, HZ/50);
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} while (1);
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}
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void *
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kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags)
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{
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void *ptr;
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ptr = kmem_zone_alloc(zone, flags);
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if (ptr)
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memset((char *)ptr, 0, kmem_cache_size(zone));
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return ptr;
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}
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