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libbpf-tools: add dcstat for monitoring disk cache statistics. #4976

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$ cd libbpf-tools/
$ make dcstat
$ sudo ./dcstat
TIME          REFS/s    SLOW/s    MISS/s  HITS
16:56:14:      4081      105       26    99.36
16:56:15:     14691      168       47    99.68
16:56:16:     12634      164       44    99.65
16:56:17:      1884      146       29    98.46
16:56:18:       209        0        0   100.00
16:56:19:       181        0        0   100.00
  • Supported  CLI options similar to dcstat.py
    • Interval
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dcstat is a simple tool that counts the various disk cache statistics.

Signed-off-by: Pratima Bhat <[email protected]>
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