• Ell's avatar
    buffer: over-trim cache when it fills up frequently · a64637b3
    Ell authored
    Trimming the tile cache can have a high overhead, since we need to
    scan the tile list for an eligible/worthwhile tile to trim.  If
    trimming happens frequently, we end up re-scanning the list each
    time.
    
    In order to amortize the cost of scanning the tile list, over-trim
    the cache by a certain amount, instead of only trimming the excess.
    When trimming happens frequently, we progressively increase the
    over-trimming ratio, up to 50% of the cache size limit.
    a64637b3
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