WebSVN – HelenOS – Diff – /branches/dd/kernel/generic/include/mm/slab.h


/*
 * Copyright (C) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup genericmm
 * @{
 */
/** @file
 */
 
#ifndef KERN_SLAB_H_
#define KERN_SLAB_H_
 
#include <adt/list.h>
#include <synch/spinlock.h>
#include <atomic.h>
#include <mm/frame.h>
 
/** Minimum size to be allocated by malloc */
#define SLAB_MIN_MALLOC_W 4
 
/** Maximum size to be allocated by malloc */
#define SLAB_MAX_MALLOC_W 18
 
/** Initial Magazine size (TODO: dynamically growing magazines) */
#define SLAB_MAG_SIZE  4
 
/** If object size is less, store control structure inside SLAB */
#define SLAB_INSIDE_SIZE   (PAGE_SIZE >> 3)
 
/** Maximum wasted space we allow for cache */
#define SLAB_MAX_BADNESS(cache)   ((PAGE_SIZE << (cache)->order) >> 2)
 
/* slab_reclaim constants */
#define SLAB_RECLAIM_ALL  0x1 /**< Reclaim all possible memory, because we are in memory stress */
 
 
/* cache_create flags */
#define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */
#define SLAB_CACHE_SLINSIDE   0x2 /**< Have control structure inside SLAB */
 
#define SLAB_CACHE_MAGDEFERRED (0x4 | SLAB_CACHE_NOMAGAZINE) /**< We add magazine cache later, if we have this flag */
 
typedef struct {
    link_t link;
    count_t busy;  /**< Count of full slots in magazine */
    count_t size;  /**< Number of slots in magazine */
    void *objs[0]; /**< Slots in magazine */
}slab_magazine_t;
 
typedef struct {
    slab_magazine_t *current;
    slab_magazine_t *last;
    SPINLOCK_DECLARE(lock);
}slab_mag_cache_t;
 
 
typedef struct {
    char *name;
 
    link_t link;
    /* Configuration */
    size_t size;      /**< Size of slab position - align_up(sizeof(obj)) */
    int (*constructor)(void *obj, int kmflag);
    int (*destructor)(void *obj);
    int flags;        /**< Flags changing behaviour of cache */
 
    /* Computed values */
    uint8_t order;        /**< Order of frames to be allocated */
    int objects;      /**< Number of objects that fit in */
 
    /* Statistics */
    atomic_t allocated_slabs;
    atomic_t allocated_objs;
    atomic_t cached_objs;
    atomic_t magazine_counter; /**< How many magazines in magazines list */
 
    /* Slabs */
    link_t full_slabs;     /**< List of full slabs */
    link_t partial_slabs;  /**< List of partial slabs */
    SPINLOCK_DECLARE(slablock);
    /* Magazines  */
    link_t magazines;      /**< List o full magazines */
    SPINLOCK_DECLARE(maglock);
 
    /** CPU cache */
    slab_mag_cache_t *mag_cache;
}slab_cache_t;
 
extern slab_cache_t * slab_cache_create(char *name,
                    size_t size,
                    size_t align,
                    int (*constructor)(void *obj, int kmflag),
                    int (*destructor)(void *obj),
                    int flags);
extern void slab_cache_destroy(slab_cache_t *cache);
 
extern void * slab_alloc(slab_cache_t *cache, int flags);
extern void slab_free(slab_cache_t *cache, void *obj);
extern count_t slab_reclaim(int flags);
 
/** Initialize slab subsytem */
extern void slab_cache_init(void);
extern void slab_enable_cpucache(void);
 
/* kconsole debug */
extern void slab_print_list(void);
 
/* malloc support */
extern void * malloc(unsigned int size, int flags);
extern void free(void *obj);
#endif
 
/** @}
 */
 

Rev 1888	Rev 1941
1	/*	1	/*
2	* Copyright (C) 2006 Ondrej Palkovsky	2	* Copyright (C) 2006 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup genericmm	29	/** @addtogroup genericmm
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef KERN_SLAB_H_	35	#ifndef KERN_SLAB_H_
36	#define KERN_SLAB_H_	36	#define KERN_SLAB_H_
37		37
38	#include <adt/list.h>	38	#include <adt/list.h>
39	#include <synch/spinlock.h>	39	#include <synch/spinlock.h>
40	#include <atomic.h>	40	#include <atomic.h>
41	#include <mm/frame.h>	41	#include <mm/frame.h>
42		42
43	/** Minimum size to be allocated by malloc */	43	/** Minimum size to be allocated by malloc */
44	#define SLAB_MIN_MALLOC_W 4	44	#define SLAB_MIN_MALLOC_W 4
45		45
46	/** Maximum size to be allocated by malloc */	46	/** Maximum size to be allocated by malloc */
47	#define SLAB_MAX_MALLOC_W 18	47	#define SLAB_MAX_MALLOC_W 18
48		48
49	/** Initial Magazine size (TODO: dynamically growing magazines) */	49	/** Initial Magazine size (TODO: dynamically growing magazines) */
50	#define SLAB_MAG_SIZE 4	50	#define SLAB_MAG_SIZE 4
51		51
52	/** If object size is less, store control structure inside SLAB */	52	/** If object size is less, store control structure inside SLAB */
53	#define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3)	53	#define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3)
54		54
55	/** Maximum wasted space we allow for cache */	55	/** Maximum wasted space we allow for cache */
56	#define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2)	56	#define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2)
57		57
58	/* slab_reclaim constants */	58	/* slab_reclaim constants */
59	#define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because	59	#define SLAB_RECLAIM_ALL 0x1 /*< Reclaim all possible memory, because we are in memory stress /
60	* we are in memory stress */	-
61		60
62	/* cache_create flags */	61	/* cache_create flags */
63	#define SLAB_CACHE_NOMAGAZINE 0x1 /*< Do not use per-cpu cache /	62	#define SLAB_CACHE_NOMAGAZINE 0x1 /*< Do not use per-cpu cache /
64	#define SLAB_CACHE_SLINSIDE 0x2 /*< Have control structure inside SLAB /	63	#define SLAB_CACHE_SLINSIDE 0x2 /*< Have control structure inside SLAB /
65	/** We add magazine cache later, if we have this flag */	-
66	#define SLAB_CACHE_MAGDEFERRED (0x4 \| SLAB_CACHE_NOMAGAZINE)	64	#define SLAB_CACHE_MAGDEFERRED (0x4 \| SLAB_CACHE_NOMAGAZINE) /*< We add magazine cache later, if we have this flag /
67		65
68	typedef struct {	66	typedef struct {
69	link_t link;	67	link_t link;
70	count_t busy; /*< Count of full slots in magazine /	68	count_t busy; /*< Count of full slots in magazine /
71	count_t size; /*< Number of slots in magazine /	69	count_t size; /*< Number of slots in magazine /
72	void objs[0]; /< Slots in magazine /	70	void objs[0]; /< Slots in magazine /
73	}slab_magazine_t;	71	}slab_magazine_t;
74		72
75	typedef struct {	73	typedef struct {
76	slab_magazine_t *current;	74	slab_magazine_t *current;
77	slab_magazine_t *last;	75	slab_magazine_t *last;
78	SPINLOCK_DECLARE(lock);	76	SPINLOCK_DECLARE(lock);
79	}slab_mag_cache_t;	77	}slab_mag_cache_t;
80		78
81		79
82	typedef struct {	80	typedef struct {
83	char *name;	81	char *name;
84		82
85	link_t link;	83	link_t link;
86	/* Configuration */	84	/* Configuration */
87	size_t size; /*< Size of slab position - align_up(sizeof(obj)) /	85	size_t size; /*< Size of slab position - align_up(sizeof(obj)) /
88	int (constructor)(void obj, int kmflag);	86	int (constructor)(void obj, int kmflag);
89	int (destructor)(void obj);	87	int (destructor)(void obj);
90	int flags; /*< Flags changing behaviour of cache /	88	int flags; /*< Flags changing behaviour of cache /
91		89
92	/* Computed values */	90	/* Computed values */
93	uint8_t order; /*< Order of frames to be allocated /	91	uint8_t order; /*< Order of frames to be allocated /
94	int objects; /*< Number of objects that fit in /	92	int objects; /*< Number of objects that fit in /
95		93
96	/* Statistics */	94	/* Statistics */
97	atomic_t allocated_slabs;	95	atomic_t allocated_slabs;
98	atomic_t allocated_objs;	96	atomic_t allocated_objs;
99	atomic_t cached_objs;	97	atomic_t cached_objs;
100	atomic_t magazine_counter; /*< How many magazines in magazines list /	98	atomic_t magazine_counter; /*< How many magazines in magazines list /
101		99
102	/* Slabs */	100	/* Slabs */
103	link_t full_slabs; /*< List of full slabs /	101	link_t full_slabs; /*< List of full slabs /
104	link_t partial_slabs; /*< List of partial slabs /	102	link_t partial_slabs; /*< List of partial slabs /
105	SPINLOCK_DECLARE(slablock);	103	SPINLOCK_DECLARE(slablock);
106	/* Magazines */	104	/* Magazines */
107	link_t magazines; /*< List o full magazines /	105	link_t magazines; /*< List o full magazines /
108	SPINLOCK_DECLARE(maglock);	106	SPINLOCK_DECLARE(maglock);
109		107
110	/** CPU cache */	108	/** CPU cache */
111	slab_mag_cache_t *mag_cache;	109	slab_mag_cache_t *mag_cache;
112	}slab_cache_t;	110	}slab_cache_t;
113		111
114	extern slab_cache_t * slab_cache_create(char *name,	112	extern slab_cache_t * slab_cache_create(char *name,
115	size_t size,	113	size_t size,
116	size_t align,	114	size_t align,
117	int (constructor)(void obj, int kmflag),	115	int (constructor)(void obj, int kmflag),
118	int (destructor)(void obj),	116	int (destructor)(void obj),
119	int flags);	117	int flags);
120	extern void slab_cache_destroy(slab_cache_t *cache);	118	extern void slab_cache_destroy(slab_cache_t *cache);
121		119
122	extern void * slab_alloc(slab_cache_t *cache, int flags);	120	extern void * slab_alloc(slab_cache_t *cache, int flags);
123	extern void slab_free(slab_cache_t cache, void obj);	121	extern void slab_free(slab_cache_t cache, void obj);
124	extern count_t slab_reclaim(int flags);	122	extern count_t slab_reclaim(int flags);
125		123
126	/** Initialize slab subsytem */	124	/** Initialize slab subsytem */
127	extern void slab_cache_init(void);	125	extern void slab_cache_init(void);
128	extern void slab_enable_cpucache(void);	126	extern void slab_enable_cpucache(void);
129		127
130	/* kconsole debug */	128	/* kconsole debug */
131	extern void slab_print_list(void);	129	extern void slab_print_list(void);
132		130
133	/* malloc support */	131	/* malloc support */
134	extern void * malloc(unsigned int size, int flags);	132	extern void * malloc(unsigned int size, int flags);
135	extern void free(void *obj);	133	extern void free(void *obj);
136	#endif	134	#endif
137		135
138	/** @}	136	/** @}
139	*/	137	*/
140		138

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