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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 | #ifndef __SLAB_H__ |
29 | #ifndef __SLAB_H__ |
30 | #define __SLAB_H__ |
30 | #define __SLAB_H__ |
31 | 31 | ||
32 | #include <list.h> |
32 | #include <list.h> |
33 | #include <synch/spinlock.h> |
33 | #include <synch/spinlock.h> |
34 | #include <arch/atomic.h> |
34 | #include <arch/atomic.h> |
35 | 35 | ||
36 | /** Minimum size to be allocated by malloc */ |
36 | /** Minimum size to be allocated by malloc */ |
37 | #define SLAB_MIN_MALLOC_W 3 |
37 | #define SLAB_MIN_MALLOC_W 3 |
38 | 38 | ||
39 | /** Maximum size to be allocated by malloc */ |
39 | /** Maximum size to be allocated by malloc */ |
40 | #define SLAB_MAX_MALLOC_W 17 |
40 | #define SLAB_MAX_MALLOC_W 17 |
41 | 41 | ||
42 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
42 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
43 | #define SLAB_MAG_SIZE 4 |
43 | #define SLAB_MAG_SIZE 4 |
44 | 44 | ||
45 | /** If object size is less, store control structure inside SLAB */ |
45 | /** If object size is less, store control structure inside SLAB */ |
46 | #define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3) |
46 | #define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3) |
47 | 47 | ||
48 | /** Maximum wasted space we allow for cache */ |
48 | /** Maximum wasted space we allow for cache */ |
49 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2) |
49 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2) |
50 | 50 | ||
51 | /* slab_reclaim constants */ |
51 | /* slab_reclaim constants */ |
52 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
52 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
53 | * we are in memory stress */ |
53 | * we are in memory stress */ |
54 | 54 | ||
55 | /* cache_create flags */ |
55 | /* cache_create flags */ |
56 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
56 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
57 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
57 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
58 | 58 | ||
59 | typedef struct { |
59 | typedef struct { |
60 | link_t link; |
60 | link_t link; |
61 | count_t busy; /**< Count of full slots in magazine */ |
61 | count_t busy; /**< Count of full slots in magazine */ |
62 | count_t size; /**< Number of slots in magazine */ |
62 | count_t size; /**< Number of slots in magazine */ |
63 | void *objs[0]; /**< Slots in magazine */ |
63 | void *objs[0]; /**< Slots in magazine */ |
64 | }slab_magazine_t; |
64 | }slab_magazine_t; |
65 | 65 | ||
66 | typedef struct { |
66 | typedef struct { |
67 | char *name; |
67 | char *name; |
68 | 68 | ||
69 | link_t link; |
69 | link_t link; |
70 | /* Configuration */ |
70 | /* Configuration */ |
71 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
71 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
72 | int (*constructor)(void *obj, int kmflag); |
72 | int (*constructor)(void *obj, int kmflag); |
73 | void (*destructor)(void *obj); |
73 | int (*destructor)(void *obj); |
74 | int flags; /**< Flags changing behaviour of cache */ |
74 | int flags; /**< Flags changing behaviour of cache */ |
75 | 75 | ||
76 | /* Computed values */ |
76 | /* Computed values */ |
77 | __u8 order; /**< Order of frames to be allocated */ |
77 | __u8 order; /**< Order of frames to be allocated */ |
78 | int objects; /**< Number of objects that fit in */ |
78 | int objects; /**< Number of objects that fit in */ |
79 | 79 | ||
80 | /* Statistics */ |
80 | /* Statistics */ |
81 | atomic_t allocated_slabs; |
81 | atomic_t allocated_slabs; |
82 | atomic_t allocated_objs; |
82 | atomic_t allocated_objs; |
83 | atomic_t cached_objs; |
83 | atomic_t cached_objs; |
84 | atomic_t magazine_counter; /*<< How many magazines in magazines list */ |
84 | atomic_t magazine_counter; /*<< How many magazines in magazines list */ |
85 | 85 | ||
86 | /* Slabs */ |
86 | /* Slabs */ |
87 | link_t full_slabs; /**< List of full slabs */ |
87 | link_t full_slabs; /**< List of full slabs */ |
88 | link_t partial_slabs; /**< List of partial slabs */ |
88 | link_t partial_slabs; /**< List of partial slabs */ |
89 | SPINLOCK_DECLARE(slablock); |
89 | SPINLOCK_DECLARE(slablock); |
90 | /* Magazines */ |
90 | /* Magazines */ |
91 | link_t magazines; /**< List o full magazines */ |
91 | link_t magazines; /**< List o full magazines */ |
92 | SPINLOCK_DECLARE(maglock); |
92 | SPINLOCK_DECLARE(maglock); |
93 | 93 | ||
94 | /** CPU cache */ |
94 | /** CPU cache */ |
95 | struct { |
95 | struct { |
96 | slab_magazine_t *current; |
96 | slab_magazine_t *current; |
97 | slab_magazine_t *last; |
97 | slab_magazine_t *last; |
98 | SPINLOCK_DECLARE(lock); |
98 | SPINLOCK_DECLARE(lock); |
99 | }mag_cache[0]; |
99 | }mag_cache[0]; |
100 | }slab_cache_t; |
100 | }slab_cache_t; |
101 | 101 | ||
102 | extern slab_cache_t * slab_cache_create(char *name, |
102 | extern slab_cache_t * slab_cache_create(char *name, |
103 | size_t size, |
103 | size_t size, |
104 | size_t align, |
104 | size_t align, |
105 | int (*constructor)(void *obj, int kmflag), |
105 | int (*constructor)(void *obj, int kmflag), |
106 | void (*destructor)(void *obj), |
106 | int (*destructor)(void *obj), |
107 | int flags); |
107 | int flags); |
108 | extern void slab_cache_destroy(slab_cache_t *cache); |
108 | extern void slab_cache_destroy(slab_cache_t *cache); |
109 | 109 | ||
110 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
110 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
111 | extern void slab_free(slab_cache_t *cache, void *obj); |
111 | extern void slab_free(slab_cache_t *cache, void *obj); |
112 | extern count_t slab_reclaim(int flags); |
112 | extern count_t slab_reclaim(int flags); |
113 | 113 | ||
114 | /** Initialize SLAB subsytem */ |
114 | /** Initialize SLAB subsytem */ |
115 | extern void slab_cache_init(void); |
115 | extern void slab_cache_init(void); |
116 | 116 | ||
117 | /* KConsole debug */ |
117 | /* KConsole debug */ |
118 | extern void slab_print_list(void); |
118 | extern void slab_print_list(void); |
119 | 119 | ||
120 | /* Malloc support */ |
120 | /* Malloc support */ |
121 | extern void * kalloc(unsigned int size, int flags); |
121 | extern void * kalloc(unsigned int size, int flags); |
122 | extern void kfree(void *obj); |
122 | extern void kfree(void *obj); |
123 | 123 | ||
124 | #endif |
124 | #endif |
125 | 125 |