i965: free scratch buffers when destroying the context

Graphics / Mesa 3D Graphics Library / Mesa - Iago Toral Quiroga [igalia.com] - 6 March 2015 06:13 UTC

If scratch space is needed for a shader stage we try to reuse the last scratch buffer bound to that stage. If we can't, we free the old scratch buffer and allocate a new one. This means we always keep the last scratch buffer for a particular shader stage around for the entire life span of the context.

These buffers are being reported by Valgrind as definitely lost after destroying the OpenGL context. For example, for the geometry shader stage:

==18350== 248 bytes in 1 blocks are definitely lost in loss record 85 of 150
==18350== at 0x4C2CC70: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18350== by 0xA1B35D6: drm_intel_gem_bo_alloc_internal (intel_bufmgr_gem.c:724)
==18350== by 0xA1B383F: drm_intel_gem_bo_alloc (intel_bufmgr_gem.c:794)
==18350== by 0xA1AEFA3: drm_intel_bo_alloc (intel_bufmgr.c:52)
==18350== by 0x9D08E31: brw_get_scratch_bo (brw_program.c:226)
==18350== by 0x9D2A0F2: do_gs_prog (brw_vec4_gs.c:280)
==18350== by 0x9D2A635: brw_gs_precompile (brw_vec4_gs.c:401)
==18350== by 0x9D14F68: brw_shader_precompile(gl_context*, gl_shader_program*) (brw_shader.cpp:76)
==18350== by 0x9D157B8: brw_link_shader (brw_shader.cpp:269)
==18350== by 0x9B0941E: _mesa_glsl_link_shader (ir_to_mesa.cpp:3038)
==18350== by 0x99AE4ED: link_program (shaderapi.c:917)
==18350== by 0x99AF365: _mesa_LinkProgram (shaderapi.c:1385)

So make sure that by the time we destroy the context we check if we have live scratch buffers for the various stages and release them if that is the case.

7f10e16 i965: free scratch buffers when destroying the context
src/mesa/drivers/dri/i965/brw_context.c | 6 ++++++
1 file changed, 6 insertions(+)

Upstream: cgit.freedesktop.org

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