From: Kienan Stewart <kstewart@efficios.com>
Date: Tue, 15 Aug 2023 15:50:16 +0000 (-0400)
Subject: Tests: use CPU ids from online ranges
X-Git-Tag: v2.12.15~7
X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;h=dae3e20b8d1833803058974c4a023e812a26701c;hp=dae3e20b8d1833803058974c4a023e812a26701c;p=lttng-tools.git

Tests: use CPU ids from online ranges

test_tracefile_count could fail randomly on systems where there are CPUs
present but not online. For example:

  $ cat /sys/devices/system/cpu/online
  0-7
  $ cat /sys/devices/system/cpu/present
  0-39

When a CPU is present, it will have an entry in
/sys/devices/system/cpu/cpuX for it's ID, and thus the test may pick
that CPU's ID. However, a present CPU which is not online is not a valid
target for taskset.

In cases where `get_any_available_cpu` is used with task set, the tests
could fail for a similar reason. This case can be somewhat less common,
because it would return the numerically lowest CPU first; however, with
online as follows cpu 0 isn't available and taskset fails.

  $ cat /sys/devices/system/cpu/online
  18-19,135,142
  $ cat /sys/devices/system/cpu/present
  0-167

Change-Id: I06ac2e67495552f54765794b154acc9e8e9990ec
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---