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We only apply the hugepage PD redirection inside the ppGTT, so during i915_vma_insert() we want to exclude the GGTT from the additional alignment constraints (thereby avoiding the extra GTT pressure from fragmentation). Add an assert to document that intention alongside the comment. v2: After discussion with Matthew, make it a blanket GGTT ban (previously we allowed the expansion for appgtt, and so indirectly ggtt). There are issues we need to fix before allowing the current appgtt to be used with hugepages, and if we do, we probably want more care over when to expand/align, as the mappable aperture inside the ggtt is precious. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.william.auld@gmail.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171009092019.20747-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.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.