From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Some random bits to make the LRC irq handler do fewer branching, locking and VMA lookups per interrupt handled. I failed to measure a significant gain on a powerful chip but it definitely results in fewer instructions and branches in the hot path. So maybe it would help a lower power chip more. Possibly makes the first run of gem_exec_nop have less variance eg. branch predictor maybe gets warmed up sooner but I am not completely confident in this interpretation. Tvrtko Ursulin (5): drm/i915: Avoid invariant conditionals in lrc interrupt handler drm/i915: Move LRCA check out of the hot path drm/i915: Cache LRCA in the context drm/i915: Grab one forcewake across the whole LRC irq handler drm/i915: Only grab and calculate timestamps when needed drivers/gpu/drm/i915/i915_debugfs.c | 15 ++-- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_gem.c | 15 ++-- drivers/gpu/drm/i915/intel_lrc.c | 131 +++++++++++++++++++------------- drivers/gpu/drm/i915/intel_lrc.h | 3 +- drivers/gpu/drm/i915/intel_ringbuffer.h | 2 + 6 files changed, 97 insertions(+), 70 deletions(-) -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
