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authorKeith Packard <keithp@keithp.com>2007-12-04 12:22:30 -0800
committerKeith Packard <keithp@keithp.com>2007-12-11 20:23:00 -0800
commit57b9a54eb668477407c8be54c041d7a9f92c1f51 (patch)
tree45210a219a48374ac1a85e087aae5b1fcd145b5e /tests
parentcfa21b22b43c7113107b5eb086b5f4d4ec36dc0a (diff)
Allow relocation to be skipped when buffers don't move.
One of the costs of superioctl has been the need to perform relocations inside the kernel. The cost of mapping the buffers to the CPU and writing data is fairly high, especially if those buffers have been mapped and read by the GPU. If we assume that buffers don't move around very often, we can have the client compute the relocations itself using the previous GPU address. When that object doesn't move, the kernel can skip computing and writing the updated data. Here's a patch which adds a new field to struct drm_bo_info_req called 'presumed_offset', and a new DRM_BO_HINT_PRESUMED_OFFSET that is set when this field has been filled in by the client. There are two separate optimizations performed when the presumed_offset is correct: 1. i915_exec_reloc checks to see if all previous buffer offsets were guessed correctly. If so, there's no need for it to look at *any* of the relocations for a buffer. When this happens, it skips the whole relocation process, simply returning success. 2. i915_apply_reloc checks to see if the target buffer offset was guessed correctly. If so, it skips mapping the relocatee, computing the relocation and writing the value. If no relocations are needed, the relocatee should never be mapped to the CPU, and so the kernel shouldn't need to wait for any fences to pass.
Diffstat (limited to 'tests')
0 files changed, 0 insertions, 0 deletions