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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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32 #include "platform/PurgeableVector.h" | 32 #include "platform/PurgeableVector.h" |
33 | 33 |
34 #include "public/platform/Platform.h" | 34 #include "public/platform/Platform.h" |
35 #include "public/platform/WebDiscardableMemory.h" | 35 #include "public/platform/WebDiscardableMemory.h" |
36 #include "wtf/Assertions.h" | 36 #include "wtf/Assertions.h" |
37 #include "wtf/OwnPtr.h" | 37 #include "wtf/OwnPtr.h" |
38 #include "wtf/PassOwnPtr.h" | 38 #include "wtf/PassOwnPtr.h" |
39 | 39 |
40 #include <cstring> | 40 #include <cstring> |
41 | 41 |
42 namespace WebCore { | 42 namespace blink { |
43 | 43 |
44 // WebDiscardableMemory allocations are expensive and page-grained. We only use | 44 // WebDiscardableMemory allocations are expensive and page-grained. We only use |
45 // 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 |
46 // discarding the memory. | 46 // discarding the memory. |
47 static const size_t minimumDiscardableAllocationSize = 4 * 4096; | 47 static const size_t minimumDiscardableAllocationSize = 4 * 4096; |
48 | 48 |
49 PurgeableVector::PurgeableVector(PurgeableOption purgeable) | 49 PurgeableVector::PurgeableVector(PurgeableOption purgeable) |
50 : m_discardableCapacity(0) | 50 : m_discardableCapacity(0) |
51 , m_discardableSize(0) | 51 , m_discardableSize(0) |
52 , m_isPurgeable(purgeable == Purgeable) | 52 , m_isPurgeable(purgeable == Purgeable) |
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252 // Discardable memory has page-granularity so align to the next page here to
minimize | 252 // Discardable memory has page-granularity so align to the next page here to
minimize |
253 // fragmentation. | 253 // fragmentation. |
254 // Since the page size is only used below to minimize fragmentation it's sti
ll safe to use it | 254 // Since the page size is only used below to minimize fragmentation it's sti
ll safe to use it |
255 // even if it gets out of sync (e.g. due to the use of huge pages). | 255 // even if it gets out of sync (e.g. due to the use of huge pages). |
256 const size_t kPageSize = 4096; | 256 const size_t kPageSize = 4096; |
257 newCapacity = (newCapacity + kPageSize - 1) & ~(kPageSize - 1); | 257 newCapacity = (newCapacity + kPageSize - 1) & ~(kPageSize - 1); |
258 | 258 |
259 return std::max(capacity, newCapacity); // Overflow check. | 259 return std::max(capacity, newCapacity); // Overflow check. |
260 } | 260 } |
261 | 261 |
262 } // namespace WebCore | 262 } // namespace blink |
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