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| 1 /* | 1 /* |
| 2 * Copyright (C) 2014 Google Inc. All rights reserved. | 2 * Copyright (C) 2014 Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
| 6 * met: | 6 * met: |
| 7 * | 7 * |
| 8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 */ | 29 */ |
| 30 | 30 |
| 31 #include "platform/PurgeableVector.h" | 31 #include "platform/PurgeableVector.h" |
| 32 | 32 |
| 33 #include "base/memory/discardable_memory.h" | 33 #include "base/memory/discardable_memory.h" |
| 34 #include "base/memory/discardable_memory_allocator.h" | 34 #include "base/memory/discardable_memory_allocator.h" |
| 35 #include "platform/web_process_memory_dump.h" | 35 #include "platform/web_process_memory_dump.h" |
| 36 #include "wtf/Assertions.h" | 36 #include "wtf/Assertions.h" |
| 37 #include "wtf/OwnPtr.h" | |
| 38 #include "wtf/PassOwnPtr.h" | |
| 39 #include "wtf/text/StringUTF8Adaptor.h" | 37 #include "wtf/text/StringUTF8Adaptor.h" |
| 40 #include "wtf/text/WTFString.h" | 38 #include "wtf/text/WTFString.h" |
| 41 | |
| 42 #include <cstring> | 39 #include <cstring> |
| 43 #include <utility> | 40 #include <utility> |
| 44 | 41 |
| 45 namespace blink { | 42 namespace blink { |
| 46 | 43 |
| 47 // DiscardableMemory allocations are expensive and page-grained. We only use | 44 // DiscardableMemory allocations are expensive and page-grained. We only use |
| 48 // them when there's a reasonable amount of memory to be saved by the OS | 45 // them when there's a reasonable amount of memory to be saved by the OS |
| 49 // discarding the memory. | 46 // discarding the memory. |
| 50 static const size_t minimumDiscardableAllocationSize = 4 * 4096; | 47 static const size_t minimumDiscardableAllocationSize = 4 * 4096; |
| 51 | 48 |
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| 266 // fragmentation. | 263 // fragmentation. |
| 267 // Since the page size is only used below to minimize fragmentation it's sti
ll safe to use it | 264 // Since the page size is only used below to minimize fragmentation it's sti
ll safe to use it |
| 268 // even if it gets out of sync (e.g. due to the use of huge pages). | 265 // even if it gets out of sync (e.g. due to the use of huge pages). |
| 269 const size_t kPageSize = 4096; | 266 const size_t kPageSize = 4096; |
| 270 newCapacity = (newCapacity + kPageSize - 1) & ~(kPageSize - 1); | 267 newCapacity = (newCapacity + kPageSize - 1) & ~(kPageSize - 1); |
| 271 | 268 |
| 272 return std::max(capacity, newCapacity); // Overflow check. | 269 return std::max(capacity, newCapacity); // Overflow check. |
| 273 } | 270 } |
| 274 | 271 |
| 275 } // namespace blink | 272 } // namespace blink |
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