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94d7c01a | 1 | /* Functions for memory limit warnings. |
9ec0b715 GM |
2 | Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
3 | 2008 Free Software Foundation, Inc. | |
94d7c01a JA |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
94d7c01a | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
94d7c01a JA |
11 | |
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
94d7c01a | 19 | |
3b672b8f | 20 | #ifdef emacs |
18160b98 | 21 | #include <config.h> |
94d7c01a | 22 | #include "lisp.h" |
3b672b8f RS |
23 | #endif |
24 | ||
25 | #ifndef emacs | |
26 | #include <stddef.h> | |
27 | typedef size_t SIZE; | |
28 | typedef void *POINTER; | |
29 | #define EXCEEDS_LISP_PTR(x) 0 | |
30 | #endif | |
31 | ||
e231fd42 | 32 | #include "mem-limits.h" |
94d7c01a | 33 | |
933f22f4 RS |
34 | #ifdef HAVE_GETRLIMIT |
35 | #include <sys/resource.h> | |
36 | #endif | |
37 | ||
94d7c01a JA |
38 | /* |
39 | Level number of warnings already issued. | |
40 | 0 -- no warnings issued. | |
41 | 1 -- 75% warning already issued. | |
42 | 2 -- 85% warning already issued. | |
3b672b8f | 43 | 3 -- 95% warning issued; keep warning frequently. |
94d7c01a | 44 | */ |
395d3972 RS |
45 | enum warnlevel { not_warned, warned_75, warned_85, warned_95 }; |
46 | ||
47 | static enum warnlevel warnlevel; | |
94d7c01a JA |
48 | |
49 | /* Function to call to issue a warning; | |
50 | 0 means don't issue them. */ | |
da396c5e | 51 | static void (*warn_function) (); |
94d7c01a | 52 | |
395d3972 RS |
53 | /* Start of data space; can be changed by calling malloc_init. */ |
54 | static POINTER data_space_start; | |
55 | ||
56 | /* Number of bytes of writable memory we can expect to be able to get. */ | |
57 | static unsigned long lim_data; | |
58 | \f | |
59 | ||
60 | #ifdef NO_LIM_DATA | |
61 | static void | |
62 | get_lim_data () | |
63 | { | |
64 | lim_data = -1; | |
65 | } | |
66 | #else /* not NO_LIM_DATA */ | |
67 | ||
51757187 AS |
68 | #if defined (HAVE_GETRLIMIT) && defined (RLIMIT_AS) |
69 | static void | |
70 | get_lim_data () | |
71 | { | |
72 | struct rlimit rlimit; | |
73 | ||
74 | getrlimit (RLIMIT_AS, &rlimit); | |
75 | if (rlimit.rlim_cur == RLIM_INFINITY) | |
76 | lim_data = -1; | |
77 | else | |
78 | lim_data = rlimit.rlim_cur; | |
79 | } | |
80 | ||
81 | #else /* not HAVE_GETRLIMIT */ | |
82 | ||
395d3972 RS |
83 | #ifdef USG |
84 | ||
85 | static void | |
86 | get_lim_data () | |
87 | { | |
88 | extern long ulimit (); | |
89 | ||
90 | lim_data = -1; | |
91 | ||
92 | /* Use the ulimit call, if we seem to have it. */ | |
93 | #if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX) | |
94 | lim_data = ulimit (3, 0); | |
95 | #endif | |
96 | ||
97 | /* If that didn't work, just use the macro's value. */ | |
98 | #ifdef ULIMIT_BREAK_VALUE | |
99 | if (lim_data == -1) | |
100 | lim_data = ULIMIT_BREAK_VALUE; | |
101 | #endif | |
102 | ||
103 | lim_data -= (long) data_space_start; | |
104 | } | |
105 | ||
106 | #else /* not USG */ | |
107 | #ifdef WINDOWSNT | |
108 | ||
109 | static void | |
110 | get_lim_data () | |
111 | { | |
112 | extern unsigned long reserved_heap_size; | |
113 | lim_data = reserved_heap_size; | |
114 | } | |
115 | ||
116 | #else | |
117 | #if !defined (BSD4_2) && !defined (__osf__) | |
118 | ||
119 | #ifdef MSDOS | |
120 | void | |
121 | get_lim_data () | |
122 | { | |
123 | _go32_dpmi_meminfo info; | |
8a445f76 | 124 | unsigned long lim1, lim2; |
395d3972 RS |
125 | |
126 | _go32_dpmi_get_free_memory_information (&info); | |
8a445f76 EZ |
127 | /* DPMI server of Windows NT and its descendants reports in |
128 | info.available_memory a much lower amount that is really | |
129 | available, which causes bogus "past 95% of memory limit" | |
130 | warnings. Try to overcome that via circumstantial evidence. */ | |
131 | lim1 = info.available_memory; | |
7cf94eac | 132 | lim2 = info.available_physical_pages; |
8a445f76 EZ |
133 | /* DPMI Spec: "Fields that are unavailable will hold -1." */ |
134 | if ((long)lim1 == -1L) | |
135 | lim1 = 0; | |
136 | if ((long)lim2 == -1L) | |
137 | lim2 = 0; | |
7cf94eac EZ |
138 | else |
139 | lim2 *= 4096; | |
8a445f76 EZ |
140 | /* Surely, the available memory is at least what we have physically |
141 | available, right? */ | |
7cf94eac | 142 | if (lim1 >= lim2) |
8a445f76 EZ |
143 | lim_data = lim1; |
144 | else | |
145 | lim_data = lim2; | |
146 | /* Don't believe they will give us more that 0.5 GB. */ | |
7cf94eac EZ |
147 | if (lim_data > 512U * 1024U * 1024U) |
148 | lim_data = 512U * 1024U * 1024U; | |
395d3972 RS |
149 | } |
150 | #else /* not MSDOS */ | |
151 | static void | |
152 | get_lim_data () | |
153 | { | |
154 | lim_data = vlimit (LIM_DATA, -1); | |
155 | } | |
156 | #endif /* not MSDOS */ | |
157 | ||
158 | #else /* BSD4_2 */ | |
159 | ||
160 | static void | |
161 | get_lim_data () | |
162 | { | |
163 | struct rlimit XXrlimit; | |
164 | ||
165 | getrlimit (RLIMIT_DATA, &XXrlimit); | |
166 | #ifdef RLIM_INFINITY | |
167 | lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */ | |
168 | #else | |
169 | lim_data = XXrlimit.rlim_cur; /* soft limit */ | |
170 | #endif | |
171 | } | |
172 | #endif /* BSD4_2 */ | |
173 | #endif /* not WINDOWSNT */ | |
174 | #endif /* not USG */ | |
51757187 | 175 | #endif /* not HAVE_GETRLIMIT */ |
395d3972 RS |
176 | #endif /* not NO_LIM_DATA */ |
177 | \f | |
178 | /* Verify amount of memory available, complaining if we're near the end. */ | |
94d7c01a | 179 | |
fd065466 RM |
180 | static void |
181 | check_memory_limits () | |
94d7c01a | 182 | { |
968e9c04 AI |
183 | #ifdef REL_ALLOC |
184 | extern POINTER (*real_morecore) (); | |
185 | #endif | |
134994ae RM |
186 | extern POINTER (*__morecore) (); |
187 | ||
94d7c01a | 188 | register POINTER cp; |
46b3623d RS |
189 | unsigned long five_percent; |
190 | unsigned long data_size; | |
395d3972 | 191 | enum warnlevel new_warnlevel; |
94d7c01a JA |
192 | |
193 | if (lim_data == 0) | |
194 | get_lim_data (); | |
3b672b8f | 195 | five_percent = lim_data / 20; |
94d7c01a JA |
196 | |
197 | /* Find current end of memory and issue warning if getting near max */ | |
968e9c04 AI |
198 | #ifdef REL_ALLOC |
199 | if (real_morecore) | |
200 | cp = (char *) (*real_morecore) (0); | |
201 | else | |
202 | #endif | |
fd065466 | 203 | cp = (char *) (*__morecore) (0); |
da396c5e | 204 | data_size = (char *) cp - (char *) data_space_start; |
94d7c01a | 205 | |
395d3972 RS |
206 | if (!warn_function) |
207 | return; | |
208 | ||
209 | /* What level of warning does current memory usage demand? */ | |
21da04c4 CY |
210 | new_warnlevel |
211 | = (data_size > five_percent * 19) ? warned_95 | |
212 | : (data_size > five_percent * 17) ? warned_85 | |
213 | : (data_size > five_percent * 15) ? warned_75 | |
214 | : not_warned; | |
395d3972 RS |
215 | |
216 | /* If we have gone up a level, give the appropriate warning. */ | |
217 | if (new_warnlevel > warnlevel || new_warnlevel == warned_95) | |
218 | { | |
219 | warnlevel = new_warnlevel; | |
220 | switch (warnlevel) | |
221 | { | |
222 | case warned_75: | |
223 | (*warn_function) ("Warning: past 75% of memory limit"); | |
224 | break; | |
225 | ||
226 | case warned_85: | |
227 | (*warn_function) ("Warning: past 85% of memory limit"); | |
228 | break; | |
229 | ||
230 | case warned_95: | |
231 | (*warn_function) ("Warning: past 95% of memory limit"); | |
232 | } | |
233 | } | |
234 | /* Handle going down in usage levels, with some hysteresis. */ | |
235 | else | |
236 | { | |
237 | /* If we go down below 70% full, issue another 75% warning | |
238 | when we go up again. */ | |
239 | if (data_size < five_percent * 14) | |
240 | warnlevel = not_warned; | |
241 | /* If we go down below 80% full, issue another 85% warning | |
242 | when we go up again. */ | |
243 | else if (warnlevel > warned_75 && data_size < five_percent * 16) | |
244 | warnlevel = warned_75; | |
245 | /* If we go down below 90% full, issue another 95% warning | |
246 | when we go up again. */ | |
247 | else if (warnlevel > warned_85 && data_size < five_percent * 18) | |
248 | warnlevel = warned_85; | |
249 | } | |
3b672b8f RS |
250 | |
251 | if (EXCEEDS_LISP_PTR (cp)) | |
da396c5e | 252 | (*warn_function) ("Warning: memory in use exceeds lisp pointer size"); |
94d7c01a | 253 | } |
395d3972 RS |
254 | \f |
255 | /* Enable memory usage warnings. | |
256 | START says where the end of pure storage is. | |
257 | WARNFUN specifies the function to call to issue a warning. */ | |
94d7c01a JA |
258 | |
259 | void | |
3b672b8f | 260 | memory_warnings (start, warnfun) |
94d7c01a JA |
261 | POINTER start; |
262 | void (*warnfun) (); | |
263 | { | |
fd065466 | 264 | extern void (* __after_morecore_hook) (); /* From gmalloc.c */ |
94d7c01a JA |
265 | |
266 | if (start) | |
267 | data_space_start = start; | |
3b672b8f RS |
268 | else |
269 | data_space_start = start_of_data (); | |
270 | ||
da396c5e | 271 | warn_function = warnfun; |
fd065466 | 272 | __after_morecore_hook = check_memory_limits; |
b78e8d0a | 273 | |
b78e8d0a AI |
274 | /* Force data limit to be recalculated on each run. */ |
275 | lim_data = 0; | |
94d7c01a | 276 | } |
ab5796a9 MB |
277 | |
278 | /* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5 | |
279 | (do not change this comment) */ |