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This adds support for using two hypercalls to change the size of the main hash page table while running as a PAPR guest. For now these hypercalls are only in experimental qemu versions. The interface is two part: first H_RESIZE_HPT_PREPARE is used to allocate and prepare the new hash table. This may be slow, but can be done asynchronously. Then, H_RESIZE_HPT_COMMIT is used to switch to the new hash table. This requires that no CPUs be concurrently updating the HPT, and so must be run under stop_machine(). This also adds a debugfs file which can be used to manually control HPT resizing or testing purposes. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Paul Mackerras <paulus@samba.org> [mpe: Rename the debugfs file to "hpt_order"] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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.