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authorNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-02-16 16:51:53 +0100
committerNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-03-06 17:45:48 +0100
commit4e0d1eca10b7d2cf0ccbdbebee698d6b716d075b (patch)
tree099a879c4532b871351bded5e07b142a318d5e73 /src/qcam/viewfinder.cpp
parent69d1e24ac75dc4003737b926bee3ce05420d047b (diff)
libcamera: V4L2BufferCache: Improve cache eviction strategy
The strategy used to find a free cache entry in the first implementation was not the smartest, it picked the first free entry. This lead to unwanted performance issues as the cache was not used as good as it could for imported buffers. Improve this by adding a last usage sequence number to the cache entries and change the eviction strategy to use the oldest free entry instead of the first one it finds. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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