< prev index next >

src/hotspot/share/gc/epsilon/epsilonHeap.cpp

Print this page
rev 56881 : imported patch 8233702-function-to-clamp-value-to-range


 195       assert(last_time <= time, "time should be monotonic");
 196 
 197       // If the thread had not allocated recently, retract the ergonomic size.
 198       // This conserves memory when the thread had initial burst of allocations,
 199       // and then started allocating only sporadically.
 200       if (last_time != 0 && (time - last_time > _decay_time_ns)) {
 201         ergo_tlab = 0;
 202         EpsilonThreadLocalData::set_ergo_tlab_size(thread, 0);
 203       }
 204     }
 205 
 206     // If we can fit the allocation under current TLAB size, do so.
 207     // Otherwise, we want to elastically increase the TLAB size.
 208     fits = (requested_size <= ergo_tlab);
 209     if (!fits) {
 210       size = (size_t) (ergo_tlab * EpsilonTLABElasticity);
 211     }
 212   }
 213 
 214   // Always honor boundaries
 215   size = MAX2(min_size, MIN2(_max_tlab_size, size));
 216 
 217   // Always honor alignment
 218   size = align_up(size, MinObjAlignment);
 219 
 220   // Check that adjustments did not break local and global invariants
 221   assert(is_object_aligned(size),
 222          "Size honors object alignment: " SIZE_FORMAT, size);
 223   assert(min_size <= size,
 224          "Size honors min size: "  SIZE_FORMAT " <= " SIZE_FORMAT, min_size, size);
 225   assert(size <= _max_tlab_size,
 226          "Size honors max size: "  SIZE_FORMAT " <= " SIZE_FORMAT, size, _max_tlab_size);
 227   assert(size <= CollectedHeap::max_tlab_size(),
 228          "Size honors global max size: "  SIZE_FORMAT " <= " SIZE_FORMAT, size, CollectedHeap::max_tlab_size());
 229 
 230   if (log_is_enabled(Trace, gc)) {
 231     ResourceMark rm;
 232     log_trace(gc)("TLAB size for \"%s\" (Requested: " SIZE_FORMAT "K, Min: " SIZE_FORMAT
 233                           "K, Max: " SIZE_FORMAT "K, Ergo: " SIZE_FORMAT "K) -> " SIZE_FORMAT "K",
 234                   thread->name(),
 235                   requested_size * HeapWordSize / K,




 195       assert(last_time <= time, "time should be monotonic");
 196 
 197       // If the thread had not allocated recently, retract the ergonomic size.
 198       // This conserves memory when the thread had initial burst of allocations,
 199       // and then started allocating only sporadically.
 200       if (last_time != 0 && (time - last_time > _decay_time_ns)) {
 201         ergo_tlab = 0;
 202         EpsilonThreadLocalData::set_ergo_tlab_size(thread, 0);
 203       }
 204     }
 205 
 206     // If we can fit the allocation under current TLAB size, do so.
 207     // Otherwise, we want to elastically increase the TLAB size.
 208     fits = (requested_size <= ergo_tlab);
 209     if (!fits) {
 210       size = (size_t) (ergo_tlab * EpsilonTLABElasticity);
 211     }
 212   }
 213 
 214   // Always honor boundaries
 215   size = clamp(size, min_size, _max_tlab_size);
 216 
 217   // Always honor alignment
 218   size = align_up(size, MinObjAlignment);
 219 
 220   // Check that adjustments did not break local and global invariants
 221   assert(is_object_aligned(size),
 222          "Size honors object alignment: " SIZE_FORMAT, size);
 223   assert(min_size <= size,
 224          "Size honors min size: "  SIZE_FORMAT " <= " SIZE_FORMAT, min_size, size);
 225   assert(size <= _max_tlab_size,
 226          "Size honors max size: "  SIZE_FORMAT " <= " SIZE_FORMAT, size, _max_tlab_size);
 227   assert(size <= CollectedHeap::max_tlab_size(),
 228          "Size honors global max size: "  SIZE_FORMAT " <= " SIZE_FORMAT, size, CollectedHeap::max_tlab_size());
 229 
 230   if (log_is_enabled(Trace, gc)) {
 231     ResourceMark rm;
 232     log_trace(gc)("TLAB size for \"%s\" (Requested: " SIZE_FORMAT "K, Min: " SIZE_FORMAT
 233                           "K, Max: " SIZE_FORMAT "K, Ergo: " SIZE_FORMAT "K) -> " SIZE_FORMAT "K",
 234                   thread->name(),
 235                   requested_size * HeapWordSize / K,


< prev index next >