Mercurial > hg > truffle

comparison src/share/vm/runtime/virtualspace.cpp @ 342:37f87013dfd8

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
6711316: Open source the Garbage-First garbage collector Summary: First mercurial integration of the code for the Garbage-First garbage collector. Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author ysr
date Thu, 05 Jun 2008 15:57:56 -0700
parents a61af66fc99e
children 1ee8caae33af
comparison
equal deleted inserted replaced
189:0b27f3512f9e 342:37f87013dfd8
233 if (!os::release_memory(base, size)) fatal("os::release_memory failed"); 233 if (!os::release_memory(base, size)) fatal("os::release_memory failed");
234 // Reserve size large enough to do manual alignment and 234 // Reserve size large enough to do manual alignment and
235 // increase size to a multiple of the desired alignment 235 // increase size to a multiple of the desired alignment
236 size = align_size_up(size, alignment); 236 size = align_size_up(size, alignment);
237 size_t extra_size = size + alignment; 237 size_t extra_size = size + alignment;
238 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 238 do {
239 if (extra_base == NULL) return; 239 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
240 // Do manual alignement 240 if (extra_base == NULL) return;
241 base = (char*) align_size_up((uintptr_t) extra_base, alignment); 241 // Do manual alignement
242 assert(base >= extra_base, "just checking"); 242 base = (char*) align_size_up((uintptr_t) extra_base, alignment);
243 // Release unused areas 243 assert(base >= extra_base, "just checking");
244 size_t unused_bottom_size = base - extra_base; 244 // Re-reserve the region at the aligned base address.
245 size_t unused_top_size = extra_size - size - unused_bottom_size; 245 os::release_memory(extra_base, extra_size);
246 assert(unused_bottom_size % os::vm_allocation_granularity() == 0, 246 base = os::reserve_memory(size, base);
247 "size not allocation aligned"); 247 } while (base == NULL);
248 assert(unused_top_size % os::vm_allocation_granularity() == 0,
249 "size not allocation aligned");
250 if (unused_bottom_size > 0) {
251 os::release_memory(extra_base, unused_bottom_size);
252 }
253 if (unused_top_size > 0) {
254 os::release_memory(base + size, unused_top_size);
255 }
256 } 248 }
257 } 249 }
258 // Done 250 // Done
259 _base = base; 251 _base = base;
260 _size = size; 252 _size = size;