Mercurial > hg > graal-jvmci-8
comparison src/share/vm/memory/generation.hpp @ 1888:a7214d79fcf1
6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data
Summary: Deprecated HandlePromotionFailure, removing the ability to turn off that feature, did away with one epoch look-ahead when deciding if a scavenge is likely to fail, relying on current data.
Reviewed-by: jmasa, johnc, poonam
| author | ysr |
|---|---|
| date | Sat, 23 Oct 2010 23:03:49 -0700 |
| parents | 126ea7725993 |
| children | f95d63e2154a |
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| 1887:cd3ef3fd20dd | 1888:a7214d79fcf1 |
|---|---|
| 171 // including expansion (Assumes called at a safepoint.) | 171 // including expansion (Assumes called at a safepoint.) |
| 172 virtual size_t contiguous_available() const = 0; | 172 virtual size_t contiguous_available() const = 0; |
| 173 // The largest number of contiguous free bytes in this or any higher generation. | 173 // The largest number of contiguous free bytes in this or any higher generation. |
| 174 virtual size_t max_contiguous_available() const; | 174 virtual size_t max_contiguous_available() const; |
| 175 | 175 |
| 176 // Returns true if promotions of the specified amount can | 176 // Returns true if promotions of the specified amount are |
| 177 // be attempted safely (without a vm failure). | 177 // likely to succeed without a promotion failure. |
| 178 // Promotion of the full amount is not guaranteed but | 178 // Promotion of the full amount is not guaranteed but |
| 179 // can be attempted. | 179 // might be attempted in the worst case. |
| 180 // younger_handles_promotion_failure | 180 virtual bool promotion_attempt_is_safe(size_t max_promotion_in_bytes) const; |
| 181 // is true if the younger generation handles a promotion | |
| 182 // failure. | |
| 183 virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes, | |
| 184 bool younger_handles_promotion_failure) const; | |
| 185 | 181 |
| 186 // For a non-young generation, this interface can be used to inform a | 182 // For a non-young generation, this interface can be used to inform a |
| 187 // generation that a promotion attempt into that generation failed. | 183 // generation that a promotion attempt into that generation failed. |
| 188 // Typically used to enable diagnostic output for post-mortem analysis, | 184 // Typically used to enable diagnostic output for post-mortem analysis, |
| 189 // but other uses of the interface are not ruled out. | 185 // but other uses of the interface are not ruled out. |
| 356 size_t word_size, | 352 size_t word_size, |
| 357 bool is_tlab) { | 353 bool is_tlab) { |
| 358 return (full || should_allocate(word_size, is_tlab)); | 354 return (full || should_allocate(word_size, is_tlab)); |
| 359 } | 355 } |
| 360 | 356 |
| 357 // Returns true if the collection is likely to be safely | |
| 358 // completed. Even if this method returns true, a collection | |
| 359 // may not be guaranteed to succeed, and the system should be | |
| 360 // able to safely unwind and recover from that failure, albeit | |
| 361 // at some additional cost. | |
| 362 virtual bool collection_attempt_is_safe() { | |
| 363 guarantee(false, "Are you sure you want to call this method?"); | |
| 364 return true; | |
| 365 } | |
| 366 | |
| 361 // Perform a garbage collection. | 367 // Perform a garbage collection. |
| 362 // If full is true attempt a full garbage collection of this generation. | 368 // If full is true attempt a full garbage collection of this generation. |
| 363 // Otherwise, attempting to (at least) free enough space to support an | 369 // Otherwise, attempting to (at least) free enough space to support an |
| 364 // allocation of the given "word_size". | 370 // allocation of the given "word_size". |
| 365 virtual void collect(bool full, | 371 virtual void collect(bool full, |