Avi Kivity a7cbfbe63f Merge "hinted handoff: give a sender a low priority" from Vlad ...

"
Hinted handoff should not overpower regular flows like READs, WRITEs or
background activities like memtable flushes or compactions.

In order to achieve this put its sending in the STEAMING CPU scheduling
group and its commitlog object into the STREAMING I/O scheduling group.

Fixes #3817
"

* 'hinted_handoff_scheduling_groups-v2' of https://github.com/vladzcloudius/scylla:
  db::hints::manager: use "streaming" I/O scheduling class for reads
  commitlog::read_log_file(): set the a read I/O priority class explicitly
  db::hints::manager: add hints sender to the "streaming" CPU scheduling group

(cherry picked from commit 1533487ba8)

2018-10-24 09:43:39 +03:00

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