1275 // Preferred young gen size for "short" pauses:
1276 // upper bound depends on # of threads and NewRatio.
1277 const uintx parallel_gc_threads =
1278 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1279 const size_t preferred_max_new_size_unaligned =
1280 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1281 size_t preferred_max_new_size =
1282 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1283
1284 // Unless explicitly requested otherwise, size young gen
1285 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1286
1287 // If either MaxNewSize or NewRatio is set on the command line,
1288 // assume the user is trying to set the size of the young gen.
1289 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1290
1291 // Set MaxNewSize to our calculated preferred_max_new_size unless
1292 // NewSize was set on the command line and it is larger than
1293 // preferred_max_new_size.
1294 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1295 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1296 } else {
1297 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1298 }
1299 if (PrintGCDetails && Verbose) {
1300 // Too early to use gclog_or_tty
1301 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1302 }
1303
1304 // Code along this path potentially sets NewSize and OldSize
1305 if (PrintGCDetails && Verbose) {
1306 // Too early to use gclog_or_tty
1307 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1308 " initial_heap_size: " SIZE_FORMAT
1309 " max_heap: " SIZE_FORMAT,
1310 min_heap_size(), InitialHeapSize, max_heap);
1311 }
1312 size_t min_new = preferred_max_new_size;
1313 if (FLAG_IS_CMDLINE(NewSize)) {
1314 min_new = NewSize;
1315 }
1316 if (max_heap > min_new && min_heap_size() > min_new) {
1317 // Unless explicitly requested otherwise, make young gen
1318 // at least min_new, and at most preferred_max_new_size.
1319 if (FLAG_IS_DEFAULT(NewSize)) {
1320 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1321 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1322 if (PrintGCDetails && Verbose) {
1323 // Too early to use gclog_or_tty
1324 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1325 }
1326 }
1327 // Unless explicitly requested otherwise, size old gen
1328 // so it's NewRatio x of NewSize.
1329 if (FLAG_IS_DEFAULT(OldSize)) {
1330 if (max_heap > NewSize) {
1331 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1332 if (PrintGCDetails && Verbose) {
1333 // Too early to use gclog_or_tty
1334 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1335 }
1336 }
1337 }
1338 }
1339 }
1340 // Unless explicitly requested otherwise, definitely
1341 // promote all objects surviving "tenuring_default" scavenges.
1342 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1343 FLAG_IS_DEFAULT(SurvivorRatio)) {
1344 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1345 }
1346 // If we decided above (or user explicitly requested)
1347 // `promote all' (via MaxTenuringThreshold := 0),
1348 // prefer minuscule survivor spaces so as not to waste
1349 // space for (non-existent) survivors
1350 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1351 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
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1275 // Preferred young gen size for "short" pauses:
1276 // upper bound depends on # of threads and NewRatio.
1277 const uintx parallel_gc_threads =
1278 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1279 const size_t preferred_max_new_size_unaligned =
1280 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1281 size_t preferred_max_new_size =
1282 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1283
1284 // Unless explicitly requested otherwise, size young gen
1285 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1286
1287 // If either MaxNewSize or NewRatio is set on the command line,
1288 // assume the user is trying to set the size of the young gen.
1289 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1290
1291 // Set MaxNewSize to our calculated preferred_max_new_size unless
1292 // NewSize was set on the command line and it is larger than
1293 // preferred_max_new_size.
1294 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1295 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2((size_t)NewSize, preferred_max_new_size));
1296 } else {
1297 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1298 }
1299 if (PrintGCDetails && Verbose) {
1300 // Too early to use gclog_or_tty
1301 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1302 }
1303
1304 // Code along this path potentially sets NewSize and OldSize
1305 if (PrintGCDetails && Verbose) {
1306 // Too early to use gclog_or_tty
1307 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1308 " initial_heap_size: " SIZE_FORMAT
1309 " max_heap: " SIZE_FORMAT,
1310 min_heap_size(), InitialHeapSize, max_heap);
1311 }
1312 size_t min_new = preferred_max_new_size;
1313 if (FLAG_IS_CMDLINE(NewSize)) {
1314 min_new = NewSize;
1315 }
1316 if (max_heap > min_new && min_heap_size() > min_new) {
1317 // Unless explicitly requested otherwise, make young gen
1318 // at least min_new, and at most preferred_max_new_size.
1319 if (FLAG_IS_DEFAULT(NewSize)) {
1320 FLAG_SET_ERGO(uintx, NewSize, MAX2((size_t)NewSize, min_new));
1321 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, (size_t)NewSize));
1322 if (PrintGCDetails && Verbose) {
1323 // Too early to use gclog_or_tty
1324 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1325 }
1326 }
1327 // Unless explicitly requested otherwise, size old gen
1328 // so it's NewRatio x of NewSize.
1329 if (FLAG_IS_DEFAULT(OldSize)) {
1330 if (max_heap > NewSize) {
1331 FLAG_SET_ERGO(uintx, OldSize, MIN2((size_t)(NewRatio*NewSize), max_heap - NewSize));
1332 if (PrintGCDetails && Verbose) {
1333 // Too early to use gclog_or_tty
1334 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1335 }
1336 }
1337 }
1338 }
1339 }
1340 // Unless explicitly requested otherwise, definitely
1341 // promote all objects surviving "tenuring_default" scavenges.
1342 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1343 FLAG_IS_DEFAULT(SurvivorRatio)) {
1344 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1345 }
1346 // If we decided above (or user explicitly requested)
1347 // `promote all' (via MaxTenuringThreshold := 0),
1348 // prefer minuscule survivor spaces so as not to waste
1349 // space for (non-existent) survivors
1350 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1351 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
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