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4ab13d3b5c
Added support for Solaris swapfs_minfree, and swapfs_reserve tunables. In additional availrmem is now available and return a reasonable value which is reasonably analogous to the Solaris meaning. On linux we return the sun of free and inactive pages since these are all easily reclaimable. All tunables are available in /proc/sys/kernel/spl/vm/* and they may need a little adjusting once we observe the real behavior. Some of the defaults are mapped to similar linux counterparts, others are straight from the OpenSolaris defaults.
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _SPL_VMSYSTM_H
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#define _SPL_VMSYSTM_H
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#include <linux/mmzone.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <sys/types.h>
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#include <asm/uaccess.h>
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/* These values are loosely coupled with the the VM page reclaim.
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* Linux uses its own heuristics to trigger page reclamation, and
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* because those interface are difficult to interface with. These
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* values should only be considered as a rough guide to the system
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* memory state and not as direct evidence that page reclaimation
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* is or is not currently in progress.
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*/
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#define ptob(pages) (pages * PAGE_SIZE)
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#define membar_producer() smp_wmb()
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#define physmem num_physpages
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#define freemem nr_free_pages()
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#define availrmem spl_kmem_availrmem()
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extern pgcnt_t minfree; /* Sum of zone->pages_min */
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extern pgcnt_t desfree; /* Sum of zone->pages_low */
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extern pgcnt_t lotsfree; /* Sum of zone->pages_high */
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extern pgcnt_t needfree; /* Always 0 unused in new Solaris */
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extern pgcnt_t swapfs_minfree; /* Solaris default value */
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extern pgcnt_t swapfs_reserve; /* Solaris default value */
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extern vmem_t *heap_arena; /* primary kernel heap arena */
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extern vmem_t *zio_alloc_arena; /* arena for zio caches */
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extern vmem_t *zio_arena; /* arena for allocating zio memory */
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#define VMEM_ALLOC 0x01
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#define VMEM_FREE 0x02
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extern pgcnt_t spl_kmem_availrmem(void);
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extern size_t vmem_size(vmem_t *vmp, int typemask);
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#define xcopyin(from, to, size) copy_from_user(to, from, size)
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#define xcopyout(from, to, size) copy_to_user(to, from, size)
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static __inline__ int
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copyin(const void *from, void *to, size_t len)
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{
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/* On error copyin routine returns -1 */
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if (xcopyin(from, to, len))
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return -1;
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return 0;
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}
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static __inline__ int
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copyout(const void *from, void *to, size_t len)
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{
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/* On error copyout routine returns -1 */
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if (xcopyout(from, to, len))
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return -1;
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return 0;
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}
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static __inline__ int
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copyinstr(const void *from, void *to, size_t len, size_t *done)
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{
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size_t rc;
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if (len == 0)
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return -ENAMETOOLONG;
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/* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
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memset(to, 0, len);
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rc = copyin(from, to, len - 1);
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if (done != NULL)
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*done = rc;
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return 0;
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}
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#endif /* SPL_VMSYSTM_H */
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