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4b123757ee
We would generally expect pagetables to be read by the IOMMU more than written by the CPU, so in NUMA systems it makes sense to locate them close to the former and avoid cross-node pagetable walks if at all possible. As it turns out, we already have a handle on the IOMMU device for the sake of coherency management, so it's trivial to grab the appropriate NUMA node when allocating new pagetable pages. Note that we drop the semantics of alloc_pages_exact(), but that's fine since they have never been necessary: the only time we're allocating more than one page is for stage 2 top-level concatenation, but since that is based on the number of IPA bits, the size is always some exact power of two anyway. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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| README | ||
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.
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.