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/*
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://zfsonlinux.org/>.
*
* The SPL 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; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will 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 the SPL. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/debug.h>
#include <sys/vmem.h>
#include <sys/kmem_cache.h>
#include <linux/mm_compat.h>
#include <linux/module.h>
vmem_t *heap_arena = NULL;
EXPORT_SYMBOL(heap_arena);
vmem_t *zio_alloc_arena = NULL;
EXPORT_SYMBOL(zio_alloc_arena);
vmem_t *zio_arena = NULL;
EXPORT_SYMBOL(zio_arena);
#define VMEM_FLOOR_SIZE (4 * 1024 * 1024) /* 4MB floor */
/*
* Return approximate virtual memory usage based on these assumptions:
*
* 1) The major SPL consumer of virtual memory is the kmem cache.
* 2) Memory allocated with vmem_alloc() is short lived and can be ignored.
* 3) Allow a 4MB floor as a generous pad given normal consumption.
* 4) The spl_kmem_cache_sem only contends with cache create/destroy.
*/
size_t
vmem_size(vmem_t *vmp, int typemask)
{
spl_kmem_cache_t *skc;
size_t alloc = VMEM_FLOOR_SIZE;
if ((typemask & VMEM_ALLOC) && (typemask & VMEM_FREE))
return (VMALLOC_TOTAL);
down_read(&spl_kmem_cache_sem);
list_for_each_entry(skc, &spl_kmem_cache_list, skc_list) {
if (skc->skc_flags & KMC_VMEM)
alloc += skc->skc_slab_size * skc->skc_slab_total;
}
up_read(&spl_kmem_cache_sem);
if (typemask & VMEM_ALLOC)
return (MIN(alloc, VMALLOC_TOTAL));
else if (typemask & VMEM_FREE)
return (MAX(VMALLOC_TOTAL - alloc, 0));
else
return (0);
}
EXPORT_SYMBOL(vmem_size);
/*
* Public vmem_alloc(), vmem_zalloc() and vmem_free() interfaces.
*/
void *
spl_vmem_alloc(size_t size, int flags, const char *func, int line)
{
ASSERT0(flags & ~KM_PUBLIC_MASK);
flags |= KM_VMEM;
#if !defined(DEBUG_KMEM)
return (spl_kmem_alloc_impl(size, flags, NUMA_NO_NODE));
#elif !defined(DEBUG_KMEM_TRACKING)
return (spl_kmem_alloc_debug(size, flags, NUMA_NO_NODE));
#else
return (spl_kmem_alloc_track(size, flags, func, line, NUMA_NO_NODE));
#endif
}
EXPORT_SYMBOL(spl_vmem_alloc);
void *
spl_vmem_zalloc(size_t size, int flags, const char *func, int line)
{
ASSERT0(flags & ~KM_PUBLIC_MASK);
flags |= (KM_VMEM | KM_ZERO);
#if !defined(DEBUG_KMEM)
return (spl_kmem_alloc_impl(size, flags, NUMA_NO_NODE));
#elif !defined(DEBUG_KMEM_TRACKING)
return (spl_kmem_alloc_debug(size, flags, NUMA_NO_NODE));
#else
return (spl_kmem_alloc_track(size, flags, func, line, NUMA_NO_NODE));
#endif
}
EXPORT_SYMBOL(spl_vmem_zalloc);
void
spl_vmem_free(const void *buf, size_t size)
{
#if !defined(DEBUG_KMEM)
return (spl_kmem_free_impl(buf, size));
#elif !defined(DEBUG_KMEM_TRACKING)
return (spl_kmem_free_debug(buf, size));
#else
return (spl_kmem_free_track(buf, size));
#endif
}
EXPORT_SYMBOL(spl_vmem_free);
int
spl_vmem_init(void)
{
return (0);
}
void
spl_vmem_fini(void)
{
}
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