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Currently, we reject attempting to pin a large bo into the mappable aperture, but only after trying to create the vma. Under debug kernels, repeatedly creating and freeing that vma for an oversized bo consumes one-third of the runtime for pwrite/pread tests as it is spent on kmalloc/kfree tracking. If we move the rejection to before creating that vma, we lose some accuracy of checking against the fence_size as opposed to object size, though the fence can never be smaller than the object. Note that the vma creation itself will reject an attempt to create a vma larger than the GTT so we can remove one redundant test. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171009084401.29090-7-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
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.