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On large memory guests it has been observed that creating a memslot for a very large range can take noticeable amount of time. Investigation showed that the time is spent walking the rmaps to update existing sptes to remove write access or set/clear dirty bits to support dirty logging. These rmap walks are unnecessary when creating or moving a memslot. A newly created memslot will not have any existing mappings, and the existing mappings of a moved memslot will have been invalidated and flushed. Any mappings established once the new/moved memslot becomes visible will be set using the properties of the new slot. Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com> Message-Id: <1591128450-11977-3-git-send-email-anthony.yznaga@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.