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Bug 758206 - Better detection for preload/prefetch telemetry. r=taras

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This commit is contained in:
Brian R. Bondy 2012-05-27 22:40:49 -04:00
parent 93d2c3c6bc
commit 367ee44491
1 changed files with 25 additions and 1 deletions
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26
toolkit/components/maintenanceservice/prefetch.cpp
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@ -70,6 +70,22 @@ WritePrefetchClearedReg()
return TRUE;
}
static BOOL
PrefetchFileAlreadyCleared(LPCWSTR prefetchPath)
{
DWORD attributes = GetFileAttributes(prefetchPath);
BOOL alreadyCleared = attributes != INVALID_FILE_ATTRIBUTES &&
attributes & FILE_ATTRIBUTE_READONLY;
nsAutoHandle prefetchFile(CreateFile(prefetchPath, GENERIC_READ, 0, NULL,
OPEN_EXISTING, 0, NULL));
LARGE_INTEGER fileSize = { 0, 0 };
alreadyCleared &= prefetchFile != INVALID_HANDLE_VALUE &&
GetFileSizeEx(prefetchFile, &fileSize) &&
fileSize.QuadPart == 0;
return alreadyCleared;
}
/**
* We found that prefetch actually causes large applications like Firefox
* to startup slower. This will get rid of the Windows prefetch files for
@ -154,6 +170,7 @@ ClearPrefetch(LPCWSTR prefetchProcessName)
}
BOOL deletedAllFFPrefetch = TRUE;
size_t deletedCount = 0;
do {
// Reset back to the prefetch directory, we know from an above check that
// we aren't exceeding MAX_PATH + 1 characters with prefetchDirLen + 1.
@ -175,6 +192,12 @@ ClearPrefetch(LPCWSTR prefetchProcessName)
continue;
}
if (PrefetchFileAlreadyCleared(prefetchPath)) {
++deletedCount;
LOG(("Prefetch file already cleared: %ls\n", prefetchPath));
continue;
}
// Delete the prefetch file and replace it with a blank read only file
HANDLE prefetchFile =
CreateFile(prefetchPath, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL);
@ -201,6 +224,7 @@ ClearPrefetch(LPCWSTR prefetchProcessName)
continue;
}
++deletedCount;
LOG(("Prefetch file cleared and set to read-only successfully: %ls\n",
prefetchPath));
} while (FindNextFileW(findHandle, &findFileData));
@ -209,7 +233,7 @@ ClearPrefetch(LPCWSTR prefetchProcessName)
// Cleanup after ourselves.
FindClose(findHandle);
if (deletedAllFFPrefetch) {
if (deletedAllFFPrefetch && deletedCount > 0) {
WritePrefetchClearedReg();
}