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io_submit.stp: various fixes

From: Jeff Moyer <jmoyer at redhat dot com>
To: systemtap at sourceware dot org
Date: Fri, 11 May 2018 15:25:49 -0400
Subject: io_submit.stp: various fixes

These fixes are pretty important for making the data gathered from
io_submit.stp useful.  Patches 1 and 3 I've been using for a while.
Patch 3 was developed recently due to issues collecting data on a
large cpu count system.

Cheers,
Jeff

[PATCH 1/3] io_submit.stp: fix array membership test
[PATCH 2/3] io_submit.stp: use an accumulator for traces
[PATCH 3/3] io_submit.stp: let the user know when the script is

Follow-Ups:
- [PATCH 1/3] io_submit.stp: fix array membership test
  - From: Jeff Moyer
- [PATCH 2/3] io_submit.stp: use an accumulator for traces
  - From: Jeff Moyer
- [PATCH 3/3] io_submit.stp: let the user know when the script is loaded
  - From: Jeff Moyer

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