Commit | Line | Data |
---|---|---|
c7743d02 HWN |
1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002 Free Software Foundation, Inc. |
2 | * | |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
c7743d02 | 7 | * |
73be1d9e | 8 | * This library is distributed in the hope that it will be useful, |
c7743d02 | 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
c7743d02 | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
c7743d02 HWN |
17 | |
18 | #include <assert.h> | |
5bd4a949 | 19 | #include <stdio.h> |
c7743d02 HWN |
20 | |
21 | #include "libguile/private-gc.h" | |
22 | #include "libguile/gc.h" | |
23 | #include "libguile/deprecation.h" | |
24 | #include "libguile/private-gc.h" | |
25 | ||
26 | scm_t_cell_type_statistics scm_i_master_freelist; | |
27 | scm_t_cell_type_statistics scm_i_master_freelist2; | |
28 | ||
29 | ||
30 | ||
31 | ||
32 | /* | |
33 | ||
34 | In older versions of GUILE GC there was extensive support for | |
35 | debugging freelists. This was useful, since the freelist was kept | |
36 | inside the heap, and writing to an object that was GC'd would mangle | |
37 | the list. Mark bits are now separate, and checking for sane cell | |
38 | access can be done much more easily by simply checking if the mark bit | |
39 | is unset before allocation. --hwn | |
40 | ||
41 | ||
42 | ||
43 | */ | |
44 | ||
45 | #if (SCM_ENABLE_DEPRECATED == 1) | |
46 | #if defined(GUILE_DEBUG_FREELIST) | |
47 | ||
48 | SCM_DEFINE (scm_map_free_list, "map-free-list", 0, 0, 0, | |
49 | (), | |
50 | "DEPRECATED\n") | |
2e945bcc | 51 | #define FUNC_NAME "s_scm_map_free_list" |
c7743d02 HWN |
52 | { |
53 | scm_c_issue_deprecation_warning ("map-free-list has been removed from GUILE. Doing nothing\n"); | |
54 | return SCM_UNSPECIFIED; | |
55 | } | |
2e945bcc | 56 | #undef FUNC_NAME |
c7743d02 HWN |
57 | |
58 | SCM_DEFINE (scm_gc_set_debug_check_freelist_x, "gc-set-debug-check-freelist!", 1, 0, 0, | |
59 | (SCM flag), | |
60 | "DEPRECATED.\n") | |
2e945bcc | 61 | #define FUNC_NAME "s_scm_gc_set_debug_check_freelist_x" |
c7743d02 HWN |
62 | { |
63 | scm_c_issue_deprecation_warning ("gc-set-debug-check-freelist! has been removed from GUILE. Doing nothing\n"); | |
64 | return SCM_UNSPECIFIED; | |
65 | } | |
66 | #undef FUNC_NAME | |
67 | ||
68 | ||
69 | #endif /* defined (GUILE_DEBUG) */ | |
70 | #endif /* deprecated */ | |
71 | ||
72 | ||
73 | ||
74 | ||
75 | /* | |
76 | This adjust FREELIST variables to decide wether or not to allocate | |
77 | more heap in the next GC run. It uses scm_gc_cells_collected and scm_gc_cells_collected1 | |
78 | */ | |
79 | ||
80 | void | |
81 | scm_i_adjust_min_yield (scm_t_cell_type_statistics *freelist) | |
82 | { | |
83 | /* min yield is adjusted upwards so that next predicted total yield | |
84 | * (allocated cells actually freed by GC) becomes | |
85 | * `min_yield_fraction' of total heap size. Note, however, that | |
86 | * the absolute value of min_yield will correspond to `collected' | |
87 | * on one master (the one which currently is triggering GC). | |
88 | * | |
89 | * The reason why we look at total yield instead of cells collected | |
90 | * on one list is that we want to take other freelists into account. | |
91 | * On this freelist, we know that (local) yield = collected cells, | |
92 | * but that's probably not the case on the other lists. | |
93 | * | |
94 | * (We might consider computing a better prediction, for example | |
95 | * by computing an average over multiple GC:s.) | |
96 | */ | |
97 | if (freelist->min_yield_fraction) | |
98 | { | |
99 | /* Pick largest of last two yields. */ | |
100 | long delta = ((SCM_HEAP_SIZE * freelist->min_yield_fraction / 100) | |
101 | - (long) SCM_MAX (scm_gc_cells_collected_1, scm_gc_cells_collected)); | |
102 | #ifdef DEBUGINFO | |
103 | fprintf (stderr, " after GC = %lu, delta = %ld\n", | |
f2893a25 | 104 | (unsigned long) scm_cells_allocated, |
c7743d02 HWN |
105 | (long) delta); |
106 | #endif | |
107 | if (delta > 0) | |
108 | freelist->min_yield += delta; | |
109 | } | |
110 | } | |
111 | ||
112 | ||
113 | static void | |
114 | scm_init_freelist (scm_t_cell_type_statistics *freelist, | |
115 | int span, | |
116 | int min_yield) | |
117 | { | |
dac04e9f HWN |
118 | if (min_yield < 1) |
119 | min_yield = 1; | |
120 | if (min_yield > 99) | |
121 | min_yield = 99; | |
122 | ||
c7743d02 HWN |
123 | freelist->heap_segment_idx = -1; |
124 | freelist->min_yield = 0; | |
125 | freelist->min_yield_fraction = min_yield; | |
126 | freelist->span = span; | |
127 | freelist->collected = 0; | |
128 | freelist->collected_1 = 0; | |
129 | freelist->heap_size = 0; | |
130 | } | |
131 | ||
132 | #if (SCM_ENABLE_DEPRECATED == 1) | |
133 | size_t scm_default_init_heap_size_1; | |
134 | int scm_default_min_yield_1; | |
135 | size_t scm_default_init_heap_size_2; | |
136 | int scm_default_min_yield_2; | |
137 | size_t scm_default_max_segment_size; | |
138 | #endif | |
139 | ||
140 | void | |
141 | scm_gc_init_freelist (void) | |
142 | { | |
dac04e9f | 143 | int init_heap_size_1 |
c7743d02 | 144 | = scm_getenv_int ("GUILE_INIT_SEGMENT_SIZE_1", SCM_DEFAULT_INIT_HEAP_SIZE_1); |
dac04e9f | 145 | int init_heap_size_2 |
c7743d02 HWN |
146 | = scm_getenv_int ("GUILE_INIT_SEGMENT_SIZE_2", SCM_DEFAULT_INIT_HEAP_SIZE_2); |
147 | ||
9bc4701c MD |
148 | /* These are the thread-local freelists. */ |
149 | scm_key_create (&scm_i_freelist, free); | |
150 | scm_key_create (&scm_i_freelist2, free); | |
151 | SCM_FREELIST_CREATE (scm_i_freelist); | |
152 | SCM_FREELIST_CREATE (scm_i_freelist2); | |
c7743d02 HWN |
153 | |
154 | scm_init_freelist (&scm_i_master_freelist2, 2, | |
155 | scm_getenv_int ("GUILE_MIN_YIELD_2", SCM_DEFAULT_MIN_YIELD_2)); | |
156 | scm_init_freelist (&scm_i_master_freelist, 1, | |
157 | scm_getenv_int ("GUILE_MIN_YIELD_1", SCM_DEFAULT_MIN_YIELD_1)); | |
158 | ||
c7743d02 | 159 | scm_max_segment_size = scm_getenv_int ("GUILE_MAX_SEGMENT_SIZE", SCM_DEFAULT_MAX_SEGMENT_SIZE); |
dac04e9f HWN |
160 | |
161 | if (scm_max_segment_size <= 0) | |
162 | scm_max_segment_size = SCM_DEFAULT_MAX_SEGMENT_SIZE; | |
163 | ||
c7743d02 HWN |
164 | |
165 | scm_i_make_initial_segment (init_heap_size_1, &scm_i_master_freelist); | |
166 | scm_i_make_initial_segment (init_heap_size_2, &scm_i_master_freelist2); | |
c7743d02 HWN |
167 | |
168 | #if (SCM_ENABLE_DEPRECATED == 1) | |
169 | if ( scm_default_init_heap_size_1 || | |
170 | scm_default_min_yield_1|| | |
171 | scm_default_init_heap_size_2|| | |
172 | scm_default_min_yield_2|| | |
173 | scm_default_max_segment_size) | |
174 | { | |
175 | scm_c_issue_deprecation_warning ("Tuning heap parameters with C variables is deprecated. Use environment variables instead."); | |
176 | } | |
177 | #endif | |
178 | } | |
179 | ||
180 | ||
181 | void | |
182 | scm_i_gc_sweep_freelist_reset (scm_t_cell_type_statistics *freelist) | |
183 | { | |
184 | freelist->collected_1 = freelist->collected; | |
185 | freelist->collected = 0; | |
186 | ||
187 | /* | |
188 | at the end we simply start with the lowest segment again. | |
189 | */ | |
190 | freelist->heap_segment_idx = -1; | |
191 | } | |
192 | ||
193 | int | |
194 | scm_i_gc_grow_heap_p (scm_t_cell_type_statistics * freelist) | |
195 | { | |
196 | return SCM_MAX (freelist->collected,freelist->collected_1) < freelist->min_yield; | |
197 | } |