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If we know that we will completely fill a pagetable (i.e. we are inserting a complete set of 512 pages), we can skip prefilling that PT with scratch entries. If we have to abort the insertion prior to writing the real entries, we will teardown the pagetable and remove it from the page directory (so that we will restart the allocation next time). We could do similar tricks for the PD and PDP, but the likelihood of a single insertion covering the entire 512 entries diminishes, as do the cycle savings. The saving are even greater (relatively) when we are preallocating page tables for huge pages, as then we never need to fill the page table. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170908181622.17791-1-chris@chris-wilson.co.uk Reviewed-by: Matthew Auld <matthew.auld@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.