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Overview
| Comment: | Add the SQLITE_MAX_MEMORY compile-time option that provides a hard upper bound on the amount of memory that SQLite will use, per process. |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | max-memory-option |
| Files: | files | file ages | folders |
| SHA1: |
77dfe2abdae88dea81217f352d87e5ba |
| User & Date: | drh 2017-03-10 15:55:54.959 |
Context
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2017-03-10
| ||
| 16:22 | Add the -DSQLITE_MAX_MEMORY=N compile-time option. The default is no limit. (check-in: eabd4ef498 user: drh tags: trunk) | |
| 15:55 | Add the SQLITE_MAX_MEMORY compile-time option that provides a hard upper bound on the amount of memory that SQLite will use, per process. (Closed-Leaf check-in: 77dfe2abda user: drh tags: max-memory-option) | |
| 14:36 | Enhance the ".stats" dot-command in the CLI to use sqlite3_status64() instead of sqlite3_status(). (check-in: 118f5c0564 user: drh tags: trunk) | |
Changes
Changes to src/malloc.c.
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213 214 215 216 217 218 219 | sqlite3_mutex_enter(mem0.mutex); } /* ** Do a memory allocation with statistics and alarms. Assume the ** lock is already held. */ | | > > > > > > | 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 |
sqlite3_mutex_enter(mem0.mutex);
}
/*
** Do a memory allocation with statistics and alarms. Assume the
** lock is already held.
*/
static void *mallocWithAlarm(int n){
void *p;
int nFull;
assert( sqlite3_mutex_held(mem0.mutex) );
assert( n>0 );
/* In Firefox (circa 2017-02-08), xRoundup() is remapped to an internal
** implementation of malloc_good_size(), which must be called in debug
** mode and specifically when the DMD "Dark Matter Detector" is enabled
** or else a crash results. Hence, do not attempt to optimize out the
** following xRoundup() call. */
nFull = sqlite3GlobalConfig.m.xRoundup(n);
#ifdef SQLITE_MAX_MEMORY
if( sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED)+nFull>SQLITE_MAX_MEMORY ){
return 0;
}
#endif
sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, n);
if( mem0.alarmThreshold>0 ){
sqlite3_int64 nUsed = sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED);
if( nUsed >= mem0.alarmThreshold - nFull ){
mem0.nearlyFull = 1;
sqlite3MallocAlarm(nFull);
|
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248 249 250 251 252 253 254 |
}
#endif
if( p ){
nFull = sqlite3MallocSize(p);
sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nFull);
sqlite3StatusUp(SQLITE_STATUS_MALLOC_COUNT, 1);
}
| | | | 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 |
}
#endif
if( p ){
nFull = sqlite3MallocSize(p);
sqlite3StatusUp(SQLITE_STATUS_MEMORY_USED, nFull);
sqlite3StatusUp(SQLITE_STATUS_MALLOC_COUNT, 1);
}
return p;
}
/*
** Allocate memory. This routine is like sqlite3_malloc() except that it
** assumes the memory subsystem has already been initialized.
*/
void *sqlite3Malloc(u64 n){
void *p;
if( n==0 || n>=0x7fffff00 ){
/* A memory allocation of a number of bytes which is near the maximum
** signed integer value might cause an integer overflow inside of the
** xMalloc(). Hence we limit the maximum size to 0x7fffff00, giving
** 255 bytes of overhead. SQLite itself will never use anything near
** this amount. The only way to reach the limit is with sqlite3_malloc() */
p = 0;
}else if( sqlite3GlobalConfig.bMemstat ){
sqlite3_mutex_enter(mem0.mutex);
p = mallocWithAlarm((int)n);
sqlite3_mutex_leave(mem0.mutex);
}else{
p = sqlite3GlobalConfig.m.xMalloc((int)n);
}
assert( EIGHT_BYTE_ALIGNMENT(p) ); /* IMP: R-11148-40995 */
return p;
}
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