[Bug 33146] New: Path of Exile "Allocating Space" very slow, due to NtFlushVirtualMemory being synchronous

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33146

             Bug #: 33146
           Summary: Path of Exile "Allocating Space" very slow, due to
                    NtFlushVirtualMemory being synchronous
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: default_357-line at yahoo.de
    Classification: Unclassified


The "Allocating Space" step of the Path of Exile installer/updater can take
upwards of ten hours to complete (compared to a few minutes under Windows).
Path of Exile calls FlushViewOfFile, which calls NtFlushVirtualMemory, which
calls msync with MS_SYNC. The MSDN documentation for FlushViewOfFile
http://msdn.microsoft.com/en-us/library/windows/desktop/aa366563%28v=vs.85%29.aspx
says, quote, "The FlushViewOfFile function does not flush the file metadata,
and it does not wait to return until the changes are flushed from the
underlying hardware disk cache and physically written to disk." This strongly
indicates that NtFlushVirtualMemory is meant to be asynchronous. I'll submit a
patch that corrects this, and fixes the Allocating Space slowdown.

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