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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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