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sbitmap: don't update the allocation hint on clear after resize
If we have a bunch of high-numbered bits allocated and then we resize the struct sbitmap_queue, when those bits get cleared, we'll update the hint and then have to re-randomize it repeatedly. Avoid that by checking that the cleared bit is still a valid hint. No measurable performance difference in the common case. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -321,7 +321,7 @@ void sbitmap_queue_clear(struct sbitmap_queue *sbq, unsigned int nr,
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{
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sbitmap_clear_bit(&sbq->sb, nr);
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sbq_wake_up(sbq);
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if (likely(!sbq->round_robin))
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if (likely(!sbq->round_robin && nr < sbq->sb.depth))
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*per_cpu_ptr(sbq->alloc_hint, cpu) = nr;
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}
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EXPORT_SYMBOL_GPL(sbitmap_queue_clear);
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