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intel: Improve bo_references performance by skipping the tree walk. 

If the target we're asking about hasn't ever been used as a relocation
target, then it obviously hasn't been used as a target by the batch's reloc
tree.  This is the common case for good GL programming where you only map
fresh buffers, and gives us a 5% win in cairo-gl.

[ # ]  backend                         test   min(s) median(s) stddev. count
before:
[  0]       gl            firefox-talos-gfx   64.680   64.756   0.06%    3/3
after:
[  0]       gl            firefox-talos-gfx   60.816   60.970   0.29%    3/3
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Eric Anholt 2009-10-20 13:20:55 -07:00
parent 67628aa39d
commit 66d2714f54
1 changed files with 15 additions and 9 deletions
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24
libdrm/intel/intel_bufmgr_gem.c
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@ -1571,23 +1571,16 @@ drm_intel_gem_bo_disable_reuse(drm_intel_bo *bo)
return 0;
}
/**
* Clear the flag set by drm_intel_gem_bo_get_aperture_space() so we're ready
* for the next drm_intel_bufmgr_check_aperture_space() call.
*/
static int
drm_intel_gem_bo_references(drm_intel_bo *bo, drm_intel_bo *target_bo)
_drm_intel_gem_bo_references(drm_intel_bo *bo, drm_intel_bo *target_bo)
{
drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
int i;
if (bo == NULL || target_bo == NULL)
return 0;
for (i = 0; i < bo_gem->reloc_count; i++) {
if (bo_gem->reloc_target_bo[i] == target_bo)
return 1;
if (drm_intel_gem_bo_references(bo_gem->reloc_target_bo[i],
if (_drm_intel_gem_bo_references(bo_gem->reloc_target_bo[i],
target_bo))
return 1;
}
@ -1595,6 +1588,19 @@ drm_intel_gem_bo_references(drm_intel_bo *bo, drm_intel_bo *target_bo)
return 0;
}
/** Return true if target_bo is referenced by bo's relocation tree. */
static int
drm_intel_gem_bo_references(drm_intel_bo *bo, drm_intel_bo *target_bo)
{
drm_intel_bo_gem *target_bo_gem = (drm_intel_bo_gem *) target_bo;
if (bo == NULL || target_bo == NULL)
return 0;
if (target_bo_gem->used_as_reloc_target)
return _drm_intel_gem_bo_references(bo, target_bo);
return 0;
}
/**
* Initializes the GEM buffer manager, which uses the kernel to allocate, map,
* and manage map buffer objections.