Glauber Costa 4f1b875784 database: add a controller for I/O on memtable flushes. ...

The algorithm and principle of operation is the same as the CPU
controller. It is, however, always enabled and we will operate on
I/O shares.

I/O-bound workloads are expected to hit the maximum once virtual
dirty fills up and stay there while the load is steady.

Signed-off-by: Glauber Costa <glauber@scylladb.com>

2018-01-03 19:58:57 -05:00

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