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The mutex is currently used for reference counting and updating
the minmax index cache.
The change uses atomics directly for reference counting and
the mutex for the minmax cache.
This is safe since the reference count is not modified beside
in _mesa_reference_buffer_object where atomics aim to be used.
While using the minmax cache, the calling code holds a reference
to the buffer object. Thus unreferencing or even referencing the
buffer object does not need to be serialized with accessing
the minmax cache.
The change reduces the time _mesa_reference_buffer_object_ takes
by about a factor of two when looking at perf results for some
of my favorite use cases.
Signed-off-by: Mathias Fröhlich <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
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Results from x11perf -copywinwin10 on Eric's SKL:
4.33338% ± 0.905054% (n=40)
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>
Tested-by: Yogesh Marathe <[email protected]>
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incompatible pointer to integer conversion assigning to 'GLintptr' (aka 'int')
from 'const char *' [-Werror,-Wint-conversion]
offset = indices;
^ ~~~~~~~
Fixes: 2d93b462b4d ("vbo: fix offset in minmax cache key")
Signed-off-by: Tapani Pälli <[email protected]>
Reviewed-by: Charmaine Lee <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
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Instead of saving primitive offset in the minmax cache key,
save the actual buffer offset which is used in the cache lookup.
Fixes rendering artifact seen with GoogleEarth when run with
VMware driver.
v2: Per Brian's comment, initialize offset to avoid compiler warning.
Cc: [email protected]
Reviewed-by: Brian Paul <[email protected]>
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This avoids repeated translations of the enum.
Reviewed-by: Ilia Mirkin <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
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When applications stream their index buffers, the caches for those BOs become
useless and add overhead, so we want to disable them. The tricky part is
coming up with the right heuristic for *when* to disable them.
The first question is which hit rate to aim for. Since I'm not aware of any
interesting borderline applications that do something like "draw two or three
times for each upload", I just kept it simple.
The second question is how soon we should give up on the caching. Applications
might have a warm-up phase where they fill a buffer gradually but then keep
reusing it. For this reason, I count the number of indices that hit and miss
(instead of the number of calls that hit or miss), since comparing that to
the size of the buffer makes sense.
Reviewed-by: Marek Olšák <[email protected]>
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Reviewed-by: Marek Olšák <[email protected]>
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Some games developers are unaware that an index buffer in a VBO still needs
to be read by the CPU if some varying data comes from a user pointer (unless
glDrawRangeElements and friends are used). This is particularly bad when
they tell us that the index buffer should live in VRAM.
This cache helps, e.g. lifting This War Of Mine (a particularly bad
offender) from under 10fps to slightly over 20fps on a Carrizo.
Note that there is nothing prohibiting a user from rendering from multiple
threads simultaneously with the same index buffer, hence the locking. (The
internal buffer map taken for the buffer still leads to a race, but at least
the locks are a move in the right direction.)
v2: disable the cache on USAGE_TEXTURE_BUFFER as well (Chris Forbes)
v3:
- use bool instead of GLboolean for MinMaxCacheDirty (Ian Romanick)
- replace the sticky USAGE_PERSISTENT_WRITE_MAP bit by a direct
AccessFlags check
Reviewed-by: Chris Forbes <[email protected]> (v2)
Reviewed-by: Marek Olšák <[email protected]>
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We will add more code for caching/memoization. Moving the existing code
into its own file helps keep things modular.
Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
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