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The contents of a ring are only valid between HEAD and TAIL, when the ring is idle (HEAD == TAIL) we can simply let the pages go under memory pressure if they are not pinned by an active context. Any new content will be written after HEAD and so the ring will again be valid between HEAD and TAIL, everything outside can be discarded. Note that we take care of ensuring that we do not reset the HEAD backwards following a GPU hang on an idle ring. The same precautions are what enable us to use stolen memory for rings. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170420101709.27250-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> |
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| README | ||
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.