Make zdb -R scale less poorly
zdb -R with :d tries to use gzip decompression 9 times per size. There's absolutely no reason for that, they're all the same decompressor. Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rich Ercolani <rincebrain@gmail.com> Closes #15726
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cmd/zdb
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@ -8491,6 +8491,14 @@ zdb_decompress_block(abd_t *pabd, void *buf, void *lbuf, uint64_t lsize,
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*cfuncp++ = ZIO_COMPRESS_LZ4;
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*cfuncp++ = ZIO_COMPRESS_LZJB;
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mask |= ZIO_COMPRESS_MASK(LZ4) | ZIO_COMPRESS_MASK(LZJB);
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/*
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* Every gzip level has the same decompressor, no need to
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* run it 9 times per bruteforce attempt.
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*/
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mask |= ZIO_COMPRESS_MASK(GZIP_2) | ZIO_COMPRESS_MASK(GZIP_3);
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mask |= ZIO_COMPRESS_MASK(GZIP_4) | ZIO_COMPRESS_MASK(GZIP_5);
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mask |= ZIO_COMPRESS_MASK(GZIP_6) | ZIO_COMPRESS_MASK(GZIP_7);
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mask |= ZIO_COMPRESS_MASK(GZIP_8) | ZIO_COMPRESS_MASK(GZIP_9);
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for (int c = 0; c < ZIO_COMPRESS_FUNCTIONS; c++)
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if (((1ULL << c) & mask) == 0)
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*cfuncp++ = c;
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