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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/test/test_file_util.h" | 5 #include "base/test/test_file_util.h" |
6 | 6 |
7 #include <sys/mman.h> | 7 #include <sys/mman.h> |
8 #include <errno.h> | 8 #include <errno.h> |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/file_util.h" | 10 #include "base/file_util.h" |
11 | 11 |
12 namespace file_util { | 12 namespace file_util { |
13 | 13 |
14 bool EvictFileFromSystemCache(const FilePath& file) { | 14 bool EvictFileFromSystemCache(const FilePath& file) { |
15 // There aren't any really direct ways to purge a file from the UBC. From | 15 // There aren't any really direct ways to purge a file from the UBC. From |
16 // talking with Amit Singh, the safest is to mmap the file with MAP_FILE (the | 16 // talking with Amit Singh, the safest is to mmap the file with MAP_FILE (the |
17 // default) + MAP_SHARED, then do an msync to invalidate the memory. The next | 17 // default) + MAP_SHARED, then do an msync to invalidate the memory. The next |
18 // open should then have to load the file from disk. | 18 // open should then have to load the file from disk. |
19 | 19 |
20 int64 length; | 20 int64 length; |
21 if (!file_util::GetFileSize(file, &length)) { | 21 if (!file_util::GetFileSize(file, &length)) { |
22 LOG(ERROR) << "failed to get size of " << file.value(); | 22 DLOG(ERROR) << "failed to get size of " << file.value(); |
23 return false; | 23 return false; |
24 } | 24 } |
25 | 25 |
26 // When a file is empty, we do not need to evict it from cache. | 26 // When a file is empty, we do not need to evict it from cache. |
27 // In fact, an attempt to map it to memory will result in error. | 27 // In fact, an attempt to map it to memory will result in error. |
28 if (length == 0) { | 28 if (length == 0) { |
29 LOG(WARNING) << "file size is zero, will not attempt to map to memory"; | 29 DLOG(WARNING) << "file size is zero, will not attempt to map to memory"; |
30 return true; | 30 return true; |
31 } | 31 } |
32 | 32 |
33 file_util::MemoryMappedFile mapped_file; | 33 file_util::MemoryMappedFile mapped_file; |
34 if (!mapped_file.Initialize(file)) { | 34 if (!mapped_file.Initialize(file)) { |
35 LOG(WARNING) << "failed to memory map " << file.value(); | 35 DLOG(WARNING) << "failed to memory map " << file.value(); |
36 return false; | 36 return false; |
37 } | 37 } |
38 | 38 |
39 if (msync(const_cast<uint8*>(mapped_file.data()), mapped_file.length(), | 39 if (msync(const_cast<uint8*>(mapped_file.data()), mapped_file.length(), |
40 MS_INVALIDATE) != 0) { | 40 MS_INVALIDATE) != 0) { |
41 LOG(WARNING) << "failed to invalidate memory map of " << file.value() | 41 DLOG(WARNING) << "failed to invalidate memory map of " << file.value() |
42 << ", errno: " << errno; | 42 << ", errno: " << errno; |
43 return false; | 43 return false; |
44 } | 44 } |
45 | 45 |
46 return true; | 46 return true; |
47 } | 47 } |
48 | 48 |
49 } // namespace file_util | 49 } // namespace file_util |
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