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4afaaefa05
mirror_zfs/include/sys/kmem.h
behlendo 4afaaefa05 Implement per-cpu local caches. This seems to have bough me another 
factor of 10x improvement on SMP system due to reduced lock contention.
This may put me in the ballpark of what is needed.  We can still further
improve things on NUMA systems by creating an additional L3 cache per 
memory node instead of the current global pool.  With luck this won't
be needed.  I should also take another look at the locking now that
everything is working.  There's a good chance I can tighten it up a
little bit and improve things a little more.

   kmem_lock: time (sec)        slabs           objs            hash
   kmem_lock:                   tot/max/calc    tot/max/calc    size/depth
   kmem_lock:  0.000999926      6/6/1           192/192/32      32768/0
   kmem_lock:  0.000999926      4/4/2           128/128/64      32768/0
   kmem_lock:  0.000999926      4/4/4           128/128/128     32768/0
   kmem_lock:  0.000999926      4/4/8           128/128/256     32768/0
   kmem_lock:  0.000999926      4/4/16          128/128/512     32768/0
   kmem_lock:  0.000999926      4/4/32          128/128/1024    32768/0
   kmem_lock:  0.000999926      4/4/64          128/128/2048    32768/0
   kmem_lock:  0.000999926      8/8/128         256/256/4096    32768/0
   kmem_lock:  0.003999704      24/23/256       768/736/8192    32768/1
   kmem_lock:  0.012999038      44/41/512       1408/1312/16384 32768/1
   kmem_lock:  0.051996153      96/93/1024      3072/2976/32768 32768/2
   kmem_lock:  0.181986536      187/184/2048    5984/5888/65536 32768/3
   kmem_lock:  0.655951469      342/339/4096    10944/10848/131072 32768/4



git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@136 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
2008-06-25 20:57:45 +00:00

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/*
* This file is part of the SPL: Solaris Porting Layer.
*
* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
* Produced at Lawrence Livermore National Laboratory
* Written by:
* Brian Behlendorf <behlendorf1@llnl.gov>,
* Herb Wartens <wartens2@llnl.gov>,
* Jim Garlick <garlick@llnl.gov>
* UCRL-CODE-235197
*
* This 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.
*
* This 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _SPL_KMEM_H
#define _SPL_KMEM_H
#ifdef __cplusplus
extern "C" {
#endif
#undef DEBUG_KMEM_UNIMPLEMENTED
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/rwsem.h>
#include <linux/hash.h>
#include <linux/ctype.h>
#include <sys/types.h>
#include <sys/debug.h>
/*
* Memory allocation interfaces
*/
#define KM_SLEEP GFP_KERNEL
#define KM_NOSLEEP GFP_ATOMIC
#undef KM_PANIC /* No linux analog */
#define KM_PUSHPAGE (GFP_KERNEL | __GFP_HIGH)
#define KM_VMFLAGS GFP_LEVEL_MASK
#define KM_FLAGS __GFP_BITS_MASK
#ifdef DEBUG_KMEM
extern atomic64_t kmem_alloc_used;
extern unsigned long kmem_alloc_max;
extern atomic64_t vmem_alloc_used;
extern unsigned long vmem_alloc_max;
extern int kmem_warning_flag;
extern atomic64_t kmem_cache_alloc_failed;
/* XXX - Not to surprisingly with debugging enabled the xmem_locks are very
* highly contended particularly on xfree(). If we want to run with this
* detailed debugging enabled for anything other than debugging we need to
* minimize the contention by moving to a lock per xmem_table entry model.
*/
#define KMEM_HASH_BITS 10
#define KMEM_TABLE_SIZE (1 << KMEM_HASH_BITS)
extern struct hlist_head kmem_table[KMEM_TABLE_SIZE];
extern struct list_head kmem_list;
extern spinlock_t kmem_lock;
#define VMEM_HASH_BITS 10
#define VMEM_TABLE_SIZE (1 << VMEM_HASH_BITS)
extern struct hlist_head vmem_table[VMEM_TABLE_SIZE];
extern struct list_head vmem_list;
extern spinlock_t vmem_lock;
typedef struct kmem_debug {
struct hlist_node kd_hlist; /* Hash node linkage */
struct list_head kd_list; /* List of all allocations */
void *kd_addr; /* Allocation pointer */
size_t kd_size; /* Allocation size */
const char *kd_func; /* Allocation function */
int kd_line; /* Allocation line */
} kmem_debug_t;
static __inline__ kmem_debug_t *
__kmem_del_init(spinlock_t *lock,struct hlist_head *table,int bits,void *addr)
{
struct hlist_head *head;
struct hlist_node *node;
struct kmem_debug *p;
unsigned long flags;
spin_lock_irqsave(lock, flags);
head = &table[hash_ptr(addr, bits)];
hlist_for_each_entry_rcu(p, node, head, kd_hlist) {
if (p->kd_addr == addr) {
hlist_del_init(&p->kd_hlist);
list_del_init(&p->kd_list);
spin_unlock_irqrestore(lock, flags);
return p;
}
}
spin_unlock_irqrestore(lock, flags);
return NULL;
}
#define __kmem_alloc(size, flags, allocator) \
({ void *_ptr_ = NULL; \
kmem_debug_t *_dptr_; \
unsigned long _flags_; \
\
_dptr_ = (kmem_debug_t *)kmalloc(sizeof(kmem_debug_t), (flags)); \
if (_dptr_ == NULL) { \
__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
"kmem_alloc(%d, 0x%x) debug failed\n", \
sizeof(kmem_debug_t), (int)(flags)); \
} else { \
/* Marked unlikely because we should never be doing this, */ \
/* we tolerate to up 2 pages but a single page is best. */ \
if (unlikely((size) > (PAGE_SIZE * 2)) && kmem_warning_flag) \
__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning large " \
"kmem_alloc(%d, 0x%x) (%ld/%ld)\n", \
(int)(size), (int)(flags), \
atomic64_read(&kmem_alloc_used), \
kmem_alloc_max); \
\
_ptr_ = (void *)allocator((size), (flags)); \
if (_ptr_ == NULL) { \
kfree(_dptr_); \
__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
"kmem_alloc(%d, 0x%x) failed (%ld/" \
"%ld)\n", (int)(size), (int)(flags), \
atomic64_read(&kmem_alloc_used), \
kmem_alloc_max); \
} else { \
atomic64_add((size), &kmem_alloc_used); \
if (unlikely(atomic64_read(&kmem_alloc_used) > \
kmem_alloc_max)) \
kmem_alloc_max = \
atomic64_read(&kmem_alloc_used); \
\
INIT_HLIST_NODE(&_dptr_->kd_hlist); \
INIT_LIST_HEAD(&_dptr_->kd_list); \
_dptr_->kd_addr = _ptr_; \
_dptr_->kd_size = (size); \
_dptr_->kd_func = __FUNCTION__; \
_dptr_->kd_line = __LINE__; \
spin_lock_irqsave(&kmem_lock, _flags_); \
hlist_add_head_rcu(&_dptr_->kd_hlist, \
&kmem_table[hash_ptr(_ptr_, KMEM_HASH_BITS)]);\
list_add_tail(&_dptr_->kd_list, &kmem_list); \
spin_unlock_irqrestore(&kmem_lock, _flags_); \
\
__CDEBUG_LIMIT(S_KMEM, D_INFO, "kmem_alloc(" \
"%d, 0x%x) = %p (%ld/%ld)\n", \
(int)(size), (int)(flags), _ptr_, \
atomic64_read(&kmem_alloc_used), \
kmem_alloc_max); \
} \
} \
\
_ptr_; \
})
#define kmem_alloc(size, flags) __kmem_alloc((size), (flags), kmalloc)
#define kmem_zalloc(size, flags) __kmem_alloc((size), (flags), kzalloc)
#define kmem_free(ptr, size) \
({ \
kmem_debug_t *_dptr_; \
ASSERT((ptr) || (size > 0)); \
\
_dptr_ = __kmem_del_init(&kmem_lock, kmem_table, KMEM_HASH_BITS, ptr);\
ASSERT(_dptr_); /* Must exist in hash due to kmem_alloc() */ \
ASSERTF(_dptr_->kd_size == (size), "kd_size (%d) != size (%d), " \
"kd_func = %s, kd_line = %d\n", _dptr_->kd_size, (size), \
_dptr_->kd_func, _dptr_->kd_line); /* Size must match */ \
atomic64_sub((size), &kmem_alloc_used); \
__CDEBUG_LIMIT(S_KMEM, D_INFO, "kmem_free(%p, %d) (%ld/%ld)\n", \
(ptr), (int)(size), atomic64_read(&kmem_alloc_used), \
kmem_alloc_max); \
\
memset(_dptr_, 0x5a, sizeof(kmem_debug_t)); \
kfree(_dptr_); \
\
memset(ptr, 0x5a, (size)); \
kfree(ptr); \
})
#define __vmem_alloc(size, flags) \
({ void *_ptr_ = NULL; \
kmem_debug_t *_dptr_; \
unsigned long _flags_; \
\
ASSERT((flags) & KM_SLEEP); \
\
_dptr_ = (kmem_debug_t *)kmalloc(sizeof(kmem_debug_t), (flags)); \
if (_dptr_ == NULL) { \
__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
"vmem_alloc(%d, 0x%x) debug failed\n", \
sizeof(kmem_debug_t), (int)(flags)); \
} else { \
_ptr_ = (void *)__vmalloc((size), (((flags) | \
__GFP_HIGHMEM) & ~__GFP_ZERO), \
PAGE_KERNEL); \
if (_ptr_ == NULL) { \
kfree(_dptr_); \
__CDEBUG_LIMIT(S_KMEM, D_WARNING, "Warning " \
"vmem_alloc(%d, 0x%x) failed (%ld/" \
"%ld)\n", (int)(size), (int)(flags), \
atomic64_read(&vmem_alloc_used), \
vmem_alloc_max); \
} else { \
if (flags & __GFP_ZERO) \
memset(_ptr_, 0, (size)); \
\
atomic64_add((size), &vmem_alloc_used); \
if (unlikely(atomic64_read(&vmem_alloc_used) > \
vmem_alloc_max)) \
vmem_alloc_max = \
atomic64_read(&vmem_alloc_used); \
\
INIT_HLIST_NODE(&_dptr_->kd_hlist); \
INIT_LIST_HEAD(&_dptr_->kd_list); \
_dptr_->kd_addr = _ptr_; \
_dptr_->kd_size = (size); \
_dptr_->kd_func = __FUNCTION__; \
_dptr_->kd_line = __LINE__; \
spin_lock_irqsave(&vmem_lock, _flags_); \
hlist_add_head_rcu(&_dptr_->kd_hlist, \
&vmem_table[hash_ptr(_ptr_, VMEM_HASH_BITS)]);\
list_add_tail(&_dptr_->kd_list, &vmem_list); \
spin_unlock_irqrestore(&vmem_lock, _flags_); \
\
__CDEBUG_LIMIT(S_KMEM, D_INFO, "vmem_alloc(" \
"%d, 0x%x) = %p (%ld/%ld)\n", \
(int)(size), (int)(flags), _ptr_, \
atomic64_read(&vmem_alloc_used), \
vmem_alloc_max); \
} \
} \
\
_ptr_; \
})
#define vmem_alloc(size, flags) __vmem_alloc((size), (flags))
#define vmem_zalloc(size, flags) __vmem_alloc((size), ((flags) | \
__GFP_ZERO))
#define vmem_free(ptr, size) \
({ \
kmem_debug_t *_dptr_; \
ASSERT((ptr) || (size > 0)); \
\
_dptr_ = __kmem_del_init(&vmem_lock, vmem_table, VMEM_HASH_BITS, ptr);\
ASSERT(_dptr_); /* Must exist in hash due to vmem_alloc() */ \
ASSERTF(_dptr_->kd_size == (size), "kd_size (%d) != size (%d), " \
"kd_func = %s, kd_line = %d\n", _dptr_->kd_size, (size), \
_dptr_->kd_func, _dptr_->kd_line); /* Size must match */ \
atomic64_sub((size), &vmem_alloc_used); \
__CDEBUG_LIMIT(S_KMEM, D_INFO, "vmem_free(%p, %d) (%ld/%ld)\n", \
(ptr), (int)(size), atomic64_read(&vmem_alloc_used), \
vmem_alloc_max); \
\
memset(_dptr_, 0x5a, sizeof(kmem_debug_t)); \
kfree(_dptr_); \
\
memset(ptr, 0x5a, (size)); \
vfree(ptr); \
})
#else /* DEBUG_KMEM */
#define kmem_alloc(size, flags) kmalloc((size), (flags))
#define kmem_zalloc(size, flags) kzalloc((size), (flags))
#define kmem_free(ptr, size) kfree(ptr)
#define vmem_alloc(size, flags) __vmalloc((size), ((flags) | \
__GFP_HIGHMEM), PAGE_KERNEL)
#define vmem_zalloc(size, flags) \
({ \
void *_ptr_ = __vmalloc((size),((flags)|__GFP_HIGHMEM),PAGE_KERNEL); \
if (_ptr_) \
memset(_ptr_, 0, (size)); \
_ptr_; \
})
#define vmem_free(ptr, size) vfree(ptr)
#endif /* DEBUG_KMEM */
#ifdef DEBUG_KMEM_UNIMPLEMENTED
static __inline__ void *
kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags)
{
#error "kmem_alloc_tryhard() not implemented"
}
#endif /* DEBUG_KMEM_UNIMPLEMENTED */
/*
* Slab allocation interfaces
*/
#undef KMC_NOTOUCH /* XXX: Unsupported */
#define KMC_NODEBUG 0x00000000 /* Default behavior */
#define KMC_NOMAGAZINE /* XXX: Unsupported */
#define KMC_NOHASH /* XXX: Unsupported */
#define KMC_QCACHE /* XXX: Unsupported */
#define KMC_REAP_CHUNK 256
#define KMC_DEFAULT_SEEKS DEFAULT_SEEKS
#ifdef DEBUG_KMEM_UNIMPLEMENTED
static __inline__ void kmem_init(void) {
#error "kmem_init() not implemented"
}
static __inline__ void kmem_thread_init(void) {
#error "kmem_thread_init() not implemented"
}
static __inline__ void kmem_mp_init(void) {
#error "kmem_mp_init() not implemented"
}
static __inline__ void kmem_reap_idspace(void) {
#error "kmem_reap_idspace() not implemented"
}
static __inline__ size_t kmem_avail(void) {
#error "kmem_avail() not implemented"
}
static __inline__ size_t kmem_maxavail(void) {
#error "kmem_maxavail() not implemented"
}
static __inline__ uint64_t kmem_cache_stat(spl_kmem_cache_t *cache) {
#error "kmem_cache_stat() not implemented"
}
#endif /* DEBUG_KMEM_UNIMPLEMENTED */
/* XXX - Used by arc.c to adjust its memory footprint. We may want
* to use this hook in the future to adjust behavior based on
* debug levels. For now it's safe to always return 0.
*/
static __inline__ int
kmem_debugging(void)
{
return 0;
}
extern int kmem_set_warning(int flag);
#define SKM_MAGIC 0x2e2e2e2e
#define SKO_MAGIC 0x20202020
#define SKS_MAGIC 0x22222222
#define SKC_MAGIC 0x2c2c2c2c
#define SPL_KMEM_CACHE_HASH_BITS 12
#define SPL_KMEM_CACHE_HASH_ELTS (1 << SPL_KMEM_CACHE_HASH_BITS)
#define SPL_KMEM_CACHE_HASH_SIZE (sizeof(struct hlist_head) * \
SPL_KMEM_CACHE_HASH_ELTS)
#define SPL_KMEM_CACHE_DELAY 5
#define SPL_KMEM_CACHE_OBJ_PER_SLAB 32
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 */
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 */
uint32_t sko_flags; /* Per object flags */
void *sko_addr; /* Buffer address */
struct spl_kmem_slab *sko_slab; /* Owned by slab */
struct list_head sko_list; /* Free object list linkage */
struct hlist_node sko_hlist; /* Used object hash 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 */
uint32_t skc_flags; /* Flags */
uint32_t skc_obj_size; /* Object size */
uint32_t skc_chunk_size; /* sizeof(*obj) + alignment */
uint32_t skc_slab_size; /* slab size */
uint32_t skc_max_chunks; /* max chunks per slab */
uint32_t skc_delay; /* slab reclaim interval */
uint32_t skc_hash_bits; /* Hash table bits */
uint32_t skc_hash_size; /* Hash table size */
uint32_t skc_hash_elts; /* Hash table elements */
struct hlist_head *skc_hash; /* Hash table address */
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 */
uint64_t skc_hash_depth; /* Lazy hash depth */
uint64_t skc_hash_count; /* Hash entries current */
} 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_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(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_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()
#ifdef HAVE_KMEM_CACHE_CREATE_DTOR
#define __kmem_cache_create(name, size, align, flags, ctor, dtor) \
kmem_cache_create(name, size, align, flags, ctor, dtor)
#else
#define __kmem_cache_create(name, size, align, flags, ctor, dtor) \
kmem_cache_create(name, size, align, flags, ctor)
#endif /* HAVE_KMEM_CACHE_CREATE_DTOR */
#ifdef __cplusplus
}
#endif
#endif /* _SPL_KMEM_H */
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