mutter/cogl/driver/gl
Neil Roberts 5085919acc pipeline-cache: Prune old unused pipelines when the cache gets too big
Previously when a pipeline is added to the cache it would never be
removed. If the application is generating a lot of unique pipelines
this can end up effectively leaking a large number of resources
including the GL program objects. Arguably this isn't really a problem
because if the application is generating that many unique pipelines
then it is doing something wrong anyway. It also implies that it will
be recompiling shaders very often so the cache leaking will likely be
the least of the problems.

This patch makes it keep track of which pipelines in the cache are in
use. The cache now returns a struct representing the entry instead of
directly returning the pipeline. This entry contains a usage counter
which the pipeline backends can use to mark when there is a pipeline
alive that is using the cache entry. When the hash table decides that
it's a good time to prune some entries, it will make a list of all of
the pipelines that are not in use and then remove the least recently
used half of the pipelines. That way it is less likely to remove
pipelines that the application is actually regenerating often even if
they aren't in use all of the time.

When the cache is pruned the hash table makes a note of how small the
cache could be if it removed all of the unused pipelines. The hash
table starts pruning when there are more entries than twice this
minimum expected size. The idea is that if that case it hit then the
hash table is more than half full of useless pipelines so the
application is generating lots of redundant pipelines and it is a good
time to remove them.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit c21aac22992bb7fef5a8d0913130b8245e67f2eb)

Conflicts:
	cogl/driver/gl/cogl-pipeline-fragend-glsl.c
	cogl/driver/gl/cogl-pipeline-progend-glsl.c
	cogl/driver/gl/cogl-pipeline-vertend-glsl.c
	cogl/driver/gl/gl/cogl-pipeline-fragend-arbfp.c
2014-01-14 12:05:17 +00:00
..
gl pipeline-cache: Prune old unused pipelines when the cache gets too big 2014-01-14 12:05:17 +00:00
gles introduce texture loaders to make allocations lazy 2014-01-09 15:49:46 +00:00
cogl-attribute-gl-private.h buffer: splits out GL specific code 2013-01-22 17:47:59 +00:00
cogl-attribute-gl.c Use COGL_FLAGS_* for the context's private feature flags 2013-11-28 18:12:22 +00:00
cogl-buffer-gl-private.h Allow propogation of OOM errors to apps 2013-01-22 17:48:07 +00:00
cogl-buffer-gl.c buffer: Don't set the invalidate hint when requesting read access 2013-02-19 15:03:30 +00:00
cogl-clip-stack-gl-private.h clip-stack: Splits out opengl specific code 2013-01-22 17:47:59 +00:00
cogl-clip-stack-gl.c Use COGL_FLAGS_* for the context's private feature flags 2013-11-28 18:12:22 +00:00
cogl-framebuffer-gl-private.h framebuffer: Bind the framebuffer before querying the bits 2013-01-22 17:48:18 +00:00
cogl-framebuffer-gl.c remove internal_format and redundant error arguments 2014-01-09 15:49:47 +00:00
cogl-pipeline-fragend-fixed-private.h Re-organize the source layout 2013-01-22 17:47:19 +00:00
cogl-pipeline-fragend-fixed.c Remove cogl-internal.h 2013-01-22 17:48:17 +00:00
cogl-pipeline-fragend-glsl-private.h Re-organize the source layout 2013-01-22 17:47:19 +00:00
cogl-pipeline-fragend-glsl.c pipeline-cache: Prune old unused pipelines when the cache gets too big 2014-01-14 12:05:17 +00:00
cogl-pipeline-opengl-private.h pipeline: improve real_blend_enable checks 2013-06-06 21:27:09 +01:00
cogl-pipeline-opengl.c Use COGL_FLAGS_* for the context's private feature flags 2013-11-28 18:12:22 +00:00
cogl-pipeline-progend-fixed-private.h Re-organize the source layout 2013-01-22 17:47:19 +00:00
cogl-pipeline-progend-fixed.c Use COGL_FLAGS_* for the context's private feature flags 2013-11-28 18:12:22 +00:00
cogl-pipeline-progend-glsl-private.h Re-organize the source layout 2013-01-22 17:47:19 +00:00
cogl-pipeline-progend-glsl.c pipeline-cache: Prune old unused pipelines when the cache gets too big 2014-01-14 12:05:17 +00:00
cogl-pipeline-vertend-fixed-private.h Re-organize the source layout 2013-01-22 17:47:19 +00:00
cogl-pipeline-vertend-fixed.c Don't generate GLSL for the point size for default pipelines 2013-06-21 14:18:37 +01:00
cogl-pipeline-vertend-glsl-private.h Re-organize the source layout 2013-01-22 17:47:19 +00:00
cogl-pipeline-vertend-glsl.c pipeline-cache: Prune old unused pipelines when the cache gets too big 2014-01-14 12:05:17 +00:00
cogl-texture-2d-gl-private.h texture: remove _cogl_texture_prepare_for_upload 2013-07-29 16:31:44 +01:00
cogl-texture-2d-gl.c remove internal_format and redundant error arguments 2014-01-09 15:49:47 +00:00
cogl-texture-gl-private.h Move _cogl_texture_get_gl_format to -texture-gl.c 2013-01-22 17:48:17 +00:00
cogl-texture-gl.c Use COGL_FLAGS_* for the context's private feature flags 2013-11-28 18:12:22 +00:00
cogl-util-gl-private.h Add the layer's sampler and uniform declarations at the start 2013-02-27 15:53:43 +00:00
cogl-util-gl.c Add the layer's sampler and uniform declarations at the start 2013-02-27 15:53:43 +00:00