[Libguestfs] [PATCH nbdkit v2 3/3] filters: stats: Add flush stats

[Richard W.M. Jones]

I have pushed some parts of these patches in order to reduce the delta
between your patches and upstream.  However still some problems with
the series:

Patch 1: Same problem with scale as discussed before.

Patch 2: At least the documentation needs to be updated since it no
longer matches what is printed.  The idea of collecting the time taken
in each operation is good on its own, so I pushed that part of it
along with small const-correctness and whitespace fixes:

  https://github.com/libguestfs/nbdkit/commit/f280530d7d042d5e8f100125ab0618515de52142

Why don't we show the total time and time / operation on each line of
output (ie. per operation), instead of synthesizing the total by
adding up reads and writes?

Patch 3: The idea of collecting flush stats is good so I pushed that
part, as well as updating the documentation:

  https://github.com/libguestfs/nbdkit/commit/8adf601835aee3779e278e13cae0489231960aee

I omitted the "if (st->bytes > 0)" part of the patch so this shows "0
bytes" which is of course wrong but we can fix that later.

Rich.

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