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Btrfs: add skeleton code for compression heuristic

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Add skeleton code for compresison heuristics. Now it iterates over all
the pages, but in the end always says "yes, compress please", ie it does
not change the current behaviour.

In the future we're going to add various heuristics to analyze the data.
This patch can be used as a baseline for measuring if the effectivness
and performance.

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ enhanced changelog, modified comments ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Timofey Titovets
2017-07-17 16:52:58 +03:00
committed by David Sterba
parent 131ce4367a
commit c2fcdcdf36
3 changed files with 39 additions and 4 deletions
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fs/btrfs/compression.h
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@@ -129,4 +129,6 @@ struct btrfs_compress_op {
extern const struct btrfs_compress_op btrfs_zlib_compress;
extern const struct btrfs_compress_op btrfs_lzo_compress;
int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end);
#endif