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mirror_zfs/include/sys/kmem.h
Brian Behlendorf 055ffd98cf Autoconf --enable-debug-* cleanup 
Cleanup the --enable-debug-* configure options, this has been pending
for quite some time and I am glad I finally got to it.  To summerize:

1) All SPL_AC_DEBUG_* macros were updated to be a more autoconf
friendly.  This mainly involved shift to the GNU approved usage of
AC_ARG_ENABLE and ensuring AS_IF is used rather than directly using
an if [ test ] construct.

2) --enable-debug-kmem=yes by default.  This simply enabled keeping
a running tally of total memory allocated and freed and reporting a
memory leak if there was one at module unload.  Additionally, it
ensure /proc/spl/kmem/slab will exist by default which is handy.
The overhead is low for this and it should not impact performance.

3) --enable-debug-kmem-tracking=no by default.  This option was added
to provide a configure option to enable to detailed memory allocation
tracking.  This support was always there but you had to know where to
turn it on.  By default this support is disabled because it is known
to badly hurt performence, however it is invaluable when chasing a
memory leak.

4) --enable-debug-kstat removed.  After further reflection I can't see
why you would ever really want to turn this support off.  It is now
always on which had the nice side effect of simplifying the proc handling
code in spl-proc.c.  We can now always assume the top level directory
will be there.

5) --enable-debug-callb removed.  This never really did anything, it was
put in provisionally because it might have been needed.  It turns out
it was not so I am just removing it to prevent confusion.
2009-10-30 13:58:51 -07:00

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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 <asm/atomic_compat.h>
#include <sys/types.h>
#include <sys/debug.h>
#include <sys/vmsystm.h>
/*
* Memory allocation interfaces
*/
#define KM_SLEEP (GFP_KERNEL | __GFP_NOFAIL)
#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
/*
* Used internally, the kernel does not need to support this flag
*/
#ifndef __GFP_ZERO
# define __GFP_ZERO 0x8000
#endif
#ifdef DEBUG_KMEM
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;
# define kmem_alloc(size, flags) __kmem_alloc((size), (flags), 0, 0)
# define kmem_zalloc(size, flags) __kmem_alloc((size), ((flags) | \
__GFP_ZERO), 0, 0)
/* The node alloc functions are only used by the SPL code itself */
# ifdef HAVE_KMALLOC_NODE
# define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 1, \
node)
# else
# define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 0, 0)
# endif
# define vmem_zalloc(size, flags) vmem_alloc((size), ((flags) | \
__GFP_ZERO))
# ifdef DEBUG_KMEM_TRACKING
extern void *kmem_alloc_track(size_t size, int flags, const char *func,
int line, int node_alloc, int node);
extern void kmem_free_track(void *ptr, size_t size);
extern void *vmem_alloc_track(size_t size, int flags, const char *func,
int line);
extern void vmem_free_track(void *ptr, size_t size);
# define __kmem_alloc(size, flags, na, node) kmem_alloc_track((size), \
(flags), __FUNCTION__, \
__LINE__, (na), (node))
# define kmem_free(ptr, size) kmem_free_track((ptr), (size))
# define vmem_alloc(size, flags) vmem_alloc_track((size), \
(flags),__FUNCTION__, \
__LINE__)
# define vmem_free(ptr, size) vmem_free_track((ptr), (size))
# else /* DEBUG_KMEM_TRACKING */
extern void *kmem_alloc_debug(size_t size, int flags, const char *func,
int line, int node_alloc, int node);
extern void kmem_free_debug(void *ptr, size_t size);
extern void *vmem_alloc_debug(size_t size, int flags, const char *func,
int line);
extern void vmem_free_debug(void *ptr, size_t size);
# define __kmem_alloc(size, flags, na, node) kmem_alloc_debug((size), \
(flags), __FUNCTION__, \
__LINE__, (na), (node))
# define kmem_free(ptr, size) kmem_free_debug((ptr), (size))
# define vmem_alloc(size, flags) vmem_alloc_debug((size), \
(flags), __FUNCTION__, \
__LINE__)
# define vmem_free(ptr, size) vmem_free_debug((ptr), (size))
# endif /* DEBUG_KMEM_TRACKING */
#else /* DEBUG_KMEM */
# define kmem_alloc(size, flags) kmalloc((size), (flags))
# define kmem_zalloc(size, flags) kzalloc((size), (flags))
# define kmem_free(ptr, size) ((void)(size), kfree(ptr))
# ifdef HAVE_KMALLOC_NODE
# define kmem_alloc_node(size, flags, node) \
kmalloc_node((size), (flags), (node))
# else
# define kmem_alloc_node(size, flags, node) \
kmalloc((size), (flags))
# endif
# 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) ((void)(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
*/
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 */
};
#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
#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);
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 */
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_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_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))
#ifdef __cplusplus
}
#endif
#endif /* _SPL_KMEM_H */
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