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Implement POSIX_MADV_WILLNEED/POSIX_MADV_DONTNEED for newer OSes

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* autoload.cc (DiscardVirtualMemory): Import.
        (PrefetchVirtualMemory): Import.
        * mmap.cc (posix_madvise): Actually implement POSIX_MADV_WILLNEED
        utilizing PrefetchVirtualMemory and POSIX_MADV_DONTNEED utilizing
        DiscardVirtualMemory on systems supporting them.
        * wincap.h (wincaps::has_broken_prefetchvm): New element.
        * wincap.cc: Implement above element throughout.
        (wincapc::init): Make sure has_broken_prefetchvm is only true on
        W10 under WOW64.
        * include/cygwin/version.h (CYGWIN_VERSION_DLL_MAJOR): Bump to 2003.
        (CYGWIN_VERSION_API_MINOR): Reset to 0.

        * new-features.xml (ov-new2.3): New section, document posix_madvise
        POSIX_MADV_WILLNEED/POSIX_MADV_DONTNEED change.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-08-27 13:34:10 +02:00
parent e6d9af11f1
commit 35d5d87540
9 changed files with 149 additions and 21 deletions
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6
winsup/cygwin/release/2.2.2 → winsup/cygwin/release/2.3.0
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@@ -1,6 +1,12 @@
What's new:
-----------
- posix_madvise(POSIX_MADV_WILLNEED) now utilizes OS functionality available
starting with Windows 8/Server 2012. Still a no-op on older systems.
- posix_madvise(POSIX_MADV_DONTNEED) now utilizes OS functionality available
starting with Windows 8.1/Server 2012R2. Still a no-op on older systems.
What changed:
-------------