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i965/perf-queries: don't invalidate/flush 3d pipeline

Lionel Landwerlin requested to merge llandwerlin/mesa:wip/i965-perf-query-no-flush into master

i965/perf-queries: don't invalidate/flush 3d pipeline

Our current implementation of performance queries is fairly harsh because it completely flushes and invalidates the 3d pipeline caches at the beginning and end of each query. An argument can be made that this is how performance should be measured but it probably doesn't reflect what the application is actually doing and the actual cost of draw calls.

A more appropriate approach is to just stall the pipeline at scoreboard, so that we measure the effect of a draw call without having the pipeline in a completely pristine state for every draw call.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com

Edited by Lionel Landwerlin

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