[Bugs] [Bug 1428056] New: performance/io-threads: Reduce the number of timing calls in iot_worker

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1428056

            Bug ID: 1428056
           Summary: performance/io-threads: Reduce the number of timing
                    calls in iot_worker
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: vbellur at redhat.com
                CC: bugs at gluster.org



performance/io-threads: Reduce the number of timing calls in iot_worker

Summary:
- Reduce the amount of unnecessary timing calls
in iot_worker servicing.
- The current logic is unnecessarily accurate and
hurts performance for many small FOPS.
- This is a cherry-pick of D3156588 for 3.8

Test Plan:
- Prove tests

Change-Id: I6db4f1ad9a48d9d474bb251a2204969061021954
Signed-off-by: Shreyas Siravara <sshreyas at fb.com>
Reviewed-on: http://review.gluster.org/16081
Smoke: Gluster Build System <jenkins at build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
Reviewed-by: Kevin Vigor <kvigor at fb.com>

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