1 /* Functions for memory limit warnings.
2 Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
3 2008 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
28 typedef void *POINTER
;
29 #define EXCEEDS_LISP_PTR(x) 0
32 #include "mem-limits.h"
35 #include <sys/resource.h>
39 Level number of warnings already issued.
40 0 -- no warnings issued.
41 1 -- 75% warning already issued.
42 2 -- 85% warning already issued.
43 3 -- 95% warning issued; keep warning frequently.
45 enum warnlevel
{ not_warned
, warned_75
, warned_85
, warned_95
};
47 static enum warnlevel warnlevel
;
49 /* Function to call to issue a warning;
50 0 means don't issue them. */
51 static void (*warn_function
) ();
53 /* Start of data space; can be changed by calling malloc_init. */
54 static POINTER data_space_start
;
56 /* Number of bytes of writable memory we can expect to be able to get. */
57 static unsigned long lim_data
;
66 #else /* not NO_LIM_DATA */
68 #if defined (HAVE_GETRLIMIT) && defined (RLIMIT_AS)
74 getrlimit (RLIMIT_AS
, &rlimit
);
75 if (rlimit
.rlim_cur
== RLIM_INFINITY
)
78 lim_data
= rlimit
.rlim_cur
;
81 #else /* not HAVE_GETRLIMIT */
88 extern long ulimit ();
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);
97 /* If that didn't work, just use the macro's value. */
98 #ifdef ULIMIT_BREAK_VALUE
100 lim_data
= ULIMIT_BREAK_VALUE
;
103 lim_data
-= (long) data_space_start
;
112 extern unsigned long reserved_heap_size
;
113 lim_data
= reserved_heap_size
;
117 #if !defined (BSD4_2) && !defined (__osf__)
123 _go32_dpmi_meminfo info
;
124 unsigned long lim1
, lim2
;
126 _go32_dpmi_get_free_memory_information (&info
);
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
;
132 lim2
= info
.available_physical_pages
* 4096;
133 /* DPMI Spec: "Fields that are unavailable will hold -1." */
134 if ((long)lim1
== -1L)
136 if ((long)lim2
== -1L)
138 /* Surely, the available memory is at least what we have physically
144 /* Don't believe they will give us more that 0.5 GB. */
145 if (lim_data
> 512 * 1024 * 1024)
146 lim_data
= 512 * 1024 * 1024;
148 #else /* not MSDOS */
152 lim_data
= vlimit (LIM_DATA
, -1);
154 #endif /* not MSDOS */
161 struct rlimit XXrlimit
;
163 getrlimit (RLIMIT_DATA
, &XXrlimit
);
165 lim_data
= XXrlimit
.rlim_cur
& RLIM_INFINITY
; /* soft limit */
167 lim_data
= XXrlimit
.rlim_cur
; /* soft limit */
171 #endif /* not WINDOWSNT */
173 #endif /* not HAVE_GETRLIMIT */
174 #endif /* not NO_LIM_DATA */
176 /* Verify amount of memory available, complaining if we're near the end. */
179 check_memory_limits ()
182 extern POINTER (*real_morecore
) ();
184 extern POINTER (*__morecore
) ();
187 unsigned long five_percent
;
188 unsigned long data_size
;
189 enum warnlevel new_warnlevel
;
193 five_percent
= lim_data
/ 20;
195 /* Find current end of memory and issue warning if getting near max */
198 cp
= (char *) (*real_morecore
) (0);
201 cp
= (char *) (*__morecore
) (0);
202 data_size
= (char *) cp
- (char *) data_space_start
;
207 /* What level of warning does current memory usage demand? */
209 = (data_size
> five_percent
* 19) ? warned_95
210 : (data_size
> five_percent
* 17) ? warned_85
211 : (data_size
> five_percent
* 15) ? warned_75
214 /* If we have gone up a level, give the appropriate warning. */
215 if (new_warnlevel
> warnlevel
|| new_warnlevel
== warned_95
)
217 warnlevel
= new_warnlevel
;
221 (*warn_function
) ("Warning: past 75% of memory limit");
225 (*warn_function
) ("Warning: past 85% of memory limit");
229 (*warn_function
) ("Warning: past 95% of memory limit");
232 /* Handle going down in usage levels, with some hysteresis. */
235 /* If we go down below 70% full, issue another 75% warning
236 when we go up again. */
237 if (data_size
< five_percent
* 14)
238 warnlevel
= not_warned
;
239 /* If we go down below 80% full, issue another 85% warning
240 when we go up again. */
241 else if (warnlevel
> warned_75
&& data_size
< five_percent
* 16)
242 warnlevel
= warned_75
;
243 /* If we go down below 90% full, issue another 95% warning
244 when we go up again. */
245 else if (warnlevel
> warned_85
&& data_size
< five_percent
* 18)
246 warnlevel
= warned_85
;
249 if (EXCEEDS_LISP_PTR (cp
))
250 (*warn_function
) ("Warning: memory in use exceeds lisp pointer size");
253 /* Enable memory usage warnings.
254 START says where the end of pure storage is.
255 WARNFUN specifies the function to call to issue a warning. */
258 memory_warnings (start
, warnfun
)
262 extern void (* __after_morecore_hook
) (); /* From gmalloc.c */
265 data_space_start
= start
;
267 data_space_start
= start_of_data ();
269 warn_function
= warnfun
;
270 __after_morecore_hook
= check_memory_limits
;
272 /* Force data limit to be recalculated on each run. */
276 /* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5
277 (do not change this comment) */