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mirror_zfs/include/sys/kmem.h
Brian Behlendorf 2b3543025c Stub out kmem cache defrag API 
At some point we are going to need to implement the kmem cache
move callbacks to allow for kmem cache defragmentation.  This
commit simply lays a small part of the API ground work, it does
not actually implement any of this feature.  This is safe for
now because the move callbacks are just an optimization.  Even
if they are registered we don't ever really have to call them.
2010-08-27 14:23:42 -07:00

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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://github.com/behlendorf/spl/>.
*
* 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/>.
\*****************************************************************************/
#ifndef _SPL_KMEM_H
#define _SPL_KMEM_H
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm_compat.h>
#include <linux/spinlock.h>
#include <linux/rwsem.h>
#include <linux/hash.h>
#include <linux/ctype.h>
#include <asm/atomic.h>
#include <sys/types.h>
#include <sys/vmsystm.h>
#include <sys/kstat.h>
/*
* Memory allocation interfaces
*/
#define KM_SLEEP GFP_NOFS
#define KM_NOSLEEP GFP_ATOMIC
#undef KM_PANIC /* No linux analog */
#define KM_PUSHPAGE (KM_SLEEP | __GFP_HIGH)
#define KM_VMFLAGS GFP_LEVEL_MASK
#define KM_FLAGS __GFP_BITS_MASK
#define KM_NODEBUG __GFP_NOWARN
/*
* Used internally, the kernel does not need to support this flag
*/
#ifndef __GFP_ZERO
# define __GFP_ZERO 0x8000
#endif
/*
* __GFP_NOFAIL looks like it will be removed from the kernel perhaps as
* early as 2.6.32. To avoid this issue when it occurs in upstream kernels
* we retry the allocation here as long as it is not __GFP_WAIT (GFP_ATOMIC).
* I would prefer the caller handle the failure case cleanly but we are
* trying to emulate Solaris and those are not the Solaris semantics.
*/
static inline void *
kmalloc_nofail(size_t size, gfp_t flags)
{
void *ptr;
do {
ptr = kmalloc(size, flags);
} while (ptr == NULL && (flags & __GFP_WAIT));
return ptr;
}
static inline void *
kzalloc_nofail(size_t size, gfp_t flags)
{
void *ptr;
do {
ptr = kzalloc(size, flags);
} while (ptr == NULL && (flags & __GFP_WAIT));
return ptr;
}
static inline void *
kmalloc_node_nofail(size_t size, gfp_t flags, int node)
{
#ifdef HAVE_KMALLOC_NODE
void *ptr;
do {
ptr = kmalloc_node(size, flags, node);
} while (ptr == NULL && (flags & __GFP_WAIT));
return ptr;
#else
return kmalloc_nofail(size, flags);
#endif /* HAVE_KMALLOC_NODE */
}
static inline void *
vmalloc_nofail(size_t size, gfp_t flags)
{
void *ptr;
/*
* Retry failed __vmalloc() allocations once every second. The
* rational for the delay is that the likely failure modes are:
*
* 1) The system has completely exhausted memory, in which case
* delaying 1 second for the memory reclaim to run is reasonable
* to avoid thrashing the system.
* 2) The system has memory but has exhausted the small virtual
* address space available on 32-bit systems. Retrying the
* allocation immediately will only result in spinning on the
* virtual address space lock. It is better delay a second and
* hope that another process will free some of the address space.
* But the bottom line is there is not much we can actually do
* since we can never safely return a failure and honor the
* Solaris semantics.
*/
while (1) {
ptr = __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
if (unlikely((ptr == NULL) && (flags & __GFP_WAIT))) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(HZ);
} else {
break;
}
}
return ptr;
}
static inline void *
vzalloc_nofail(size_t size, gfp_t flags)
{
void *ptr;
ptr = vmalloc_nofail(size, flags);
if (ptr)
memset(ptr, 0, (size));
return ptr;
}
#ifdef DEBUG_KMEM
/*
* Memory accounting functions to be used only when DEBUG_KMEM is set.
*/
# ifdef HAVE_ATOMIC64_T
# define kmem_alloc_used_add(size) atomic64_add(size, &kmem_alloc_used)
# define kmem_alloc_used_sub(size) atomic64_sub(size, &kmem_alloc_used)
# define kmem_alloc_used_read() atomic64_read(&kmem_alloc_used)
# define kmem_alloc_used_set(size) atomic64_set(&kmem_alloc_used, size)
# define vmem_alloc_used_add(size) atomic64_add(size, &vmem_alloc_used)
# define vmem_alloc_used_sub(size) atomic64_sub(size, &vmem_alloc_used)
# define vmem_alloc_used_read() atomic64_read(&vmem_alloc_used)
# define vmem_alloc_used_set(size) atomic64_set(&vmem_alloc_used, size)
extern atomic64_t kmem_alloc_used;
extern unsigned long long kmem_alloc_max;
extern atomic64_t vmem_alloc_used;
extern unsigned long long vmem_alloc_max;
# else /* HAVE_ATOMIC64_T */
# define kmem_alloc_used_add(size) atomic_add(size, &kmem_alloc_used)
# define kmem_alloc_used_sub(size) atomic_sub(size, &kmem_alloc_used)
# define kmem_alloc_used_read() atomic_read(&kmem_alloc_used)
# define kmem_alloc_used_set(size) atomic_set(&kmem_alloc_used, size)
# define vmem_alloc_used_add(size) atomic_add(size, &vmem_alloc_used)
# define vmem_alloc_used_sub(size) atomic_sub(size, &vmem_alloc_used)
# define vmem_alloc_used_read() atomic_read(&vmem_alloc_used)
# define vmem_alloc_used_set(size) atomic_set(&vmem_alloc_used, size)
extern atomic_t kmem_alloc_used;
extern unsigned long long kmem_alloc_max;
extern atomic_t vmem_alloc_used;
extern unsigned long long vmem_alloc_max;
# endif /* HAVE_ATOMIC64_T */
# ifdef DEBUG_KMEM_TRACKING
/*
* DEBUG_KMEM && DEBUG_KMEM_TRACKING
*
* The maximum level of memory debugging. All memory will be accounted
* for and each allocation will be explicitly tracked. Any allocation
* which is leaked will be reported on module unload and the exact location
* where that memory was allocation will be reported. This level of memory
* tracking will have a significant impact on performance and should only
* be enabled for debugging. This feature may be enabled by passing
* --enable-debug-kmem-tracking to configure.
*/
# define kmem_alloc(sz, fl) kmem_alloc_track((sz), (fl), \
__FUNCTION__, __LINE__, 0, 0)
# define kmem_zalloc(sz, fl) kmem_alloc_track((sz), (fl)|__GFP_ZERO,\
__FUNCTION__, __LINE__, 0, 0)
# define kmem_alloc_node(sz, fl, nd) kmem_alloc_track((sz), (fl), \
__FUNCTION__, __LINE__, 1, nd)
# define kmem_free(ptr, sz) kmem_free_track((ptr), (sz))
# define vmem_alloc(sz, fl) vmem_alloc_track((sz), (fl), \
__FUNCTION__, __LINE__)
# define vmem_zalloc(sz, fl) vmem_alloc_track((sz), (fl)|__GFP_ZERO,\
__FUNCTION__, __LINE__)
# define vmem_free(ptr, sz) vmem_free_track((ptr), (sz))
extern void *kmem_alloc_track(size_t, int, const char *, int, int, int);
extern void kmem_free_track(void *, size_t);
extern void *vmem_alloc_track(size_t, int, const char *, int);
extern void vmem_free_track(void *, size_t);
# else /* DEBUG_KMEM_TRACKING */
/*
* DEBUG_KMEM && !DEBUG_KMEM_TRACKING
*
* The default build will set DEBUG_KEM. This provides basic memory
* accounting with little to no impact on performance. When the module
* is unloaded in any memory was leaked the total number of leaked bytes
* will be reported on the console. To disable this basic accounting
* pass the --disable-debug-kmem option to configure.
*/
# define kmem_alloc(sz, fl) kmem_alloc_debug((sz), (fl), \
__FUNCTION__, __LINE__, 0, 0)
# define kmem_zalloc(sz, fl) kmem_alloc_debug((sz), (fl)|__GFP_ZERO,\
__FUNCTION__, __LINE__, 0, 0)
# define kmem_alloc_node(sz, fl, nd) kmem_alloc_debug((sz), (fl), \
__FUNCTION__, __LINE__, 1, nd)
# define kmem_free(ptr, sz) kmem_free_debug((ptr), (sz))
# define vmem_alloc(sz, fl) vmem_alloc_debug((sz), (fl), \
__FUNCTION__, __LINE__)
# define vmem_zalloc(sz, fl) vmem_alloc_debug((sz), (fl)|__GFP_ZERO,\
__FUNCTION__, __LINE__)
# define vmem_free(ptr, sz) vmem_free_debug((ptr), (sz))
extern void *kmem_alloc_debug(size_t, int, const char *, int, int, int);
extern void kmem_free_debug(void *, size_t);
extern void *vmem_alloc_debug(size_t, int, const char *, int);
extern void vmem_free_debug(void *, size_t);
# endif /* DEBUG_KMEM_TRACKING */
#else /* DEBUG_KMEM */
/*
* !DEBUG_KMEM && !DEBUG_KMEM_TRACKING
*
* All debugging is disabled. There will be no overhead even for
* minimal memory accounting. To enable basic accounting pass the
* --enable-debug-kmem option to configure.
*/
# define kmem_alloc(sz, fl) kmalloc_nofail((sz), (fl))
# define kmem_zalloc(sz, fl) kzalloc_nofail((sz), (fl))
# define kmem_alloc_node(sz, fl, nd) kmalloc_node_nofail((sz), (fl), (nd))
# define kmem_free(ptr, sz) ((void)(sz), kfree(ptr))
# define vmem_alloc(sz, fl) vmalloc_nofail((sz), (fl))
# define vmem_zalloc(sz, fl) vzalloc_nofail((sz), (fl))
# define vmem_free(ptr, sz) ((void)(sz), vfree(ptr))
#endif /* DEBUG_KMEM */
extern int kmem_debugging(void);
extern char *kmem_vasprintf(const char *fmt, va_list ap);
extern char *kmem_asprintf(const char *fmt, ...);
extern char *strdup(const char *str);
extern void strfree(char *str);
/*
* Slab allocation interfaces. The SPL slab differs from the standard
* Linux SLAB or SLUB primarily in that each cache may be backed by slabs
* allocated from the physical or virtal memory address space. The virtual
* slabs allow for good behavior when allocation large objects of identical
* size. This slab implementation also supports both constructors and
* destructions which the Linux slab does not.
*/
enum {
KMC_BIT_NOTOUCH = 0, /* Don't update ages */
KMC_BIT_NODEBUG = 1, /* Default behavior */
KMC_BIT_NOMAGAZINE = 2, /* XXX: Unsupported */
KMC_BIT_NOHASH = 3, /* XXX: Unsupported */
KMC_BIT_QCACHE = 4, /* XXX: Unsupported */
KMC_BIT_KMEM = 5, /* Use kmem cache */
KMC_BIT_VMEM = 6, /* Use vmem cache */
KMC_BIT_OFFSLAB = 7, /* Objects not on slab */
KMC_BIT_REAPING = 16, /* Reaping in progress */
KMC_BIT_DESTROY = 17, /* Destroy in progress */
};
/* kmem move callback return values */
typedef enum kmem_cbrc {
KMEM_CBRC_YES = 0, /* Object moved */
KMEM_CBRC_NO = 1, /* Object not moved */
KMEM_CBRC_LATER = 2, /* Object not moved, try again later */
KMEM_CBRC_DONT_NEED = 3, /* Neither object is needed */
KMEM_CBRC_DONT_KNOW = 4, /* Object unknown */
} kmem_cbrc_t;
#define KMC_NOTOUCH (1 << KMC_BIT_NOTOUCH)
#define KMC_NODEBUG (1 << KMC_BIT_NODEBUG)
#define KMC_NOMAGAZINE (1 << KMC_BIT_NOMAGAZINE)
#define KMC_NOHASH (1 << KMC_BIT_NOHASH)
#define KMC_QCACHE (1 << KMC_BIT_QCACHE)
#define KMC_KMEM (1 << KMC_BIT_KMEM)
#define KMC_VMEM (1 << KMC_BIT_VMEM)
#define KMC_OFFSLAB (1 << KMC_BIT_OFFSLAB)
#define KMC_REAPING (1 << KMC_BIT_REAPING)
#define KMC_DESTROY (1 << KMC_BIT_DESTROY)
#define KMC_REAP_CHUNK INT_MAX
#define KMC_DEFAULT_SEEKS 1
extern struct list_head spl_kmem_cache_list;
extern struct rw_semaphore spl_kmem_cache_sem;
#define SKM_MAGIC 0x2e2e2e2e
#define SKO_MAGIC 0x20202020
#define SKS_MAGIC 0x22222222
#define SKC_MAGIC 0x2c2c2c2c
#define SPL_KMEM_CACHE_DELAY 15 /* Minimum slab release age */
#define SPL_KMEM_CACHE_REAP 0 /* Default reap everything */
#define SPL_KMEM_CACHE_OBJ_PER_SLAB 32 /* Target objects per slab */
#define SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN 8 /* Minimum objects per slab */
#define SPL_KMEM_CACHE_ALIGN 8 /* Default object alignment */
#define POINTER_IS_VALID(p) 0 /* Unimplemented */
#define POINTER_INVALIDATE(pp) /* Unimplemented */
typedef int (*spl_kmem_ctor_t)(void *, void *, int);
typedef void (*spl_kmem_dtor_t)(void *, void *);
typedef void (*spl_kmem_reclaim_t)(void *);
typedef struct spl_kmem_magazine {
uint32_t skm_magic; /* Sanity magic */
uint32_t skm_avail; /* Available objects */
uint32_t skm_size; /* Magazine size */
uint32_t skm_refill; /* Batch refill size */
struct spl_kmem_cache *skm_cache; /* Owned by cache */
struct delayed_work skm_work; /* Magazine reclaim work */
unsigned long skm_age; /* Last cache access */
void *skm_objs[0]; /* Object pointers */
} spl_kmem_magazine_t;
typedef struct spl_kmem_obj {
uint32_t sko_magic; /* Sanity magic */
void *sko_addr; /* Buffer address */
struct spl_kmem_slab *sko_slab; /* Owned by slab */
struct list_head sko_list; /* Free object list linkage */
} spl_kmem_obj_t;
typedef struct spl_kmem_slab {
uint32_t sks_magic; /* Sanity magic */
uint32_t sks_objs; /* Objects per slab */
struct spl_kmem_cache *sks_cache; /* Owned by cache */
struct list_head sks_list; /* Slab list linkage */
struct list_head sks_free_list; /* Free object list */
unsigned long sks_age; /* Last modify jiffie */
uint32_t sks_ref; /* Ref count used objects */
} spl_kmem_slab_t;
typedef struct spl_kmem_cache {
uint32_t skc_magic; /* Sanity magic */
uint32_t skc_name_size; /* Name length */
char *skc_name; /* Name string */
spl_kmem_magazine_t *skc_mag[NR_CPUS]; /* Per-CPU warm cache */
uint32_t skc_mag_size; /* Magazine size */
uint32_t skc_mag_refill; /* Magazine refill count */
spl_kmem_ctor_t skc_ctor; /* Constructor */
spl_kmem_dtor_t skc_dtor; /* Destructor */
spl_kmem_reclaim_t skc_reclaim; /* Reclaimator */
void *skc_private; /* Private data */
void *skc_vmp; /* Unused */
unsigned long skc_flags; /* Flags */
uint32_t skc_obj_size; /* Object size */
uint32_t skc_obj_align; /* Object alignment */
uint32_t skc_slab_objs; /* Objects per slab */
uint32_t skc_slab_size; /* Slab size */
uint32_t skc_delay; /* Slab reclaim interval */
uint32_t skc_reap; /* Slab reclaim count */
atomic_t skc_ref; /* Ref count callers */
struct delayed_work skc_work; /* Slab reclaim work */
struct list_head skc_list; /* List of caches linkage */
struct list_head skc_complete_list;/* Completely alloc'ed */
struct list_head skc_partial_list; /* Partially alloc'ed */
spinlock_t skc_lock; /* Cache lock */
uint64_t skc_slab_fail; /* Slab alloc failures */
uint64_t skc_slab_create;/* Slab creates */
uint64_t skc_slab_destroy;/* Slab destroys */
uint64_t skc_slab_total; /* Slab total current */
uint64_t skc_slab_alloc; /* Slab alloc current */
uint64_t skc_slab_max; /* Slab max historic */
uint64_t skc_obj_total; /* Obj total current */
uint64_t skc_obj_alloc; /* Obj alloc current */
uint64_t skc_obj_max; /* Obj max historic */
} spl_kmem_cache_t;
#define kmem_cache_t spl_kmem_cache_t
extern spl_kmem_cache_t *spl_kmem_cache_create(char *name, size_t size,
size_t align, spl_kmem_ctor_t ctor, spl_kmem_dtor_t dtor,
spl_kmem_reclaim_t reclaim, void *priv, void *vmp, int flags);
extern void spl_kmem_cache_set_move(kmem_cache_t *,
kmem_cbrc_t (*)(void *, void *, size_t, void *));
extern void spl_kmem_cache_destroy(spl_kmem_cache_t *skc);
extern void *spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags);
extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc);
extern void spl_kmem_reap(void);
int spl_kmem_init_kallsyms_lookup(void);
int spl_kmem_init(void);
void spl_kmem_fini(void);
#define kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags) \
spl_kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags)
#define kmem_cache_set_move(skc, move) spl_kmem_cache_set_move(skc, move)
#define kmem_cache_destroy(skc) spl_kmem_cache_destroy(skc)
#define kmem_cache_alloc(skc, flags) spl_kmem_cache_alloc(skc, flags)
#define kmem_cache_free(skc, obj) spl_kmem_cache_free(skc, obj)
#define kmem_cache_reap_now(skc) spl_kmem_cache_reap_now(skc)
#define kmem_reap() spl_kmem_reap()
#define kmem_virt(ptr) (((ptr) >= (void *)VMALLOC_START) && \
((ptr) < (void *)VMALLOC_END))
#endif /* _SPL_KMEM_H */
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