Mercurial > hg > graal-jvmci-8
comparison src/share/vm/gc_implementation/concurrentMarkSweep/freeList.cpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
author | ysr |
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date | Wed, 23 Dec 2009 09:23:54 -0800 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
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1111:44f61c24ddab | 1145:e018e6884bd8 |
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79 set_head(NULL); | 79 set_head(NULL); |
80 set_tail(NULL); | 80 set_tail(NULL); |
81 set_hint(hint); | 81 set_hint(hint); |
82 } | 82 } |
83 | 83 |
84 void FreeList::init_statistics() { | 84 void FreeList::init_statistics(bool split_birth) { |
85 _allocation_stats.initialize(); | 85 _allocation_stats.initialize(split_birth); |
86 } | 86 } |
87 | 87 |
88 FreeChunk* FreeList::getChunkAtHead() { | 88 FreeChunk* FreeList::getChunkAtHead() { |
89 assert_proper_lock_protection(); | 89 assert_proper_lock_protection(); |
90 assert(head() == NULL || head()->prev() == NULL, "list invariant"); | 90 assert(head() == NULL || head()->prev() == NULL, "list invariant"); |
290 } | 290 } |
291 return false; | 291 return false; |
292 } | 292 } |
293 | 293 |
294 #ifndef PRODUCT | 294 #ifndef PRODUCT |
295 void FreeList::verify_stats() const { | |
296 // The +1 of the LH comparand is to allow some "looseness" in | |
297 // checking: we usually call this interface when adding a block | |
298 // and we'll subsequently update the stats; we cannot update the | |
299 // stats beforehand because in the case of the large-block BT | |
300 // dictionary for example, this might be the first block and | |
301 // in that case there would be no place that we could record | |
302 // the stats (which are kept in the block itself). | |
303 assert(_allocation_stats.prevSweep() + _allocation_stats.splitBirths() + 1 // Total Stock + 1 | |
304 >= _allocation_stats.splitDeaths() + (ssize_t)count(), "Conservation Principle"); | |
305 } | |
306 | |
295 void FreeList::assert_proper_lock_protection_work() const { | 307 void FreeList::assert_proper_lock_protection_work() const { |
296 #ifdef ASSERT | 308 assert(_protecting_lock != NULL, "Don't call this directly"); |
297 if (_protecting_lock != NULL && | 309 assert(ParallelGCThreads > 0, "Don't call this directly"); |
298 SharedHeap::heap()->n_par_threads() > 0) { | 310 Thread* thr = Thread::current(); |
299 // Should become an assert. | 311 if (thr->is_VM_thread() || thr->is_ConcurrentGC_thread()) { |
300 guarantee(_protecting_lock->owned_by_self(), "FreeList RACE DETECTED"); | 312 // assert that we are holding the freelist lock |
301 } | 313 } else if (thr->is_GC_task_thread()) { |
302 #endif | 314 assert(_protecting_lock->owned_by_self(), "FreeList RACE DETECTED"); |
315 } else if (thr->is_Java_thread()) { | |
316 assert(!SafepointSynchronize::is_at_safepoint(), "Should not be executing"); | |
317 } else { | |
318 ShouldNotReachHere(); // unaccounted thread type? | |
319 } | |
303 } | 320 } |
304 #endif | 321 #endif |
305 | 322 |
306 // Print the "label line" for free list stats. | 323 // Print the "label line" for free list stats. |
307 void FreeList::print_labels_on(outputStream* st, const char* c) { | 324 void FreeList::print_labels_on(outputStream* st, const char* c) { |