Btrfs: heuristic: add byte set calculation

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Calculate byte set size for data sample:
- calculate how many unique bytes have been in the sample
- for all bytes count > 0, check if we're still in the low count range
  (~25%), such data are easily compressible, otherwise furhter analysis
  is needed

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update comments ]
Signed-off-by: David Sterba <dsterba@suse.com>

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Timofey Titovets 2017-09-28 17:33:40 +03:00 • committed by David Sterba

parent 1fe4f6fa5a

commit a288e92cac

1 changed files with 45 additions and 0 deletions

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fs/btrfs/compression.c

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