Tests: use CPU ids from online ranges

[lttng-tools.git] / tests / utils / utils.sh

diff --git a/tests/utils/utils.sh b/tests/utils/utils.sh
index 4fa31952cb6719a20567ae86152c3350c8377303..44b3f167a8bb54a078c25370018eeee1533878e8 100644 (file)
--- a/tests/utils/utils.sh
+++ b/tests/utils/utils.sh
@@ -214,6 +214,27 @@ function randstring()
        echo
 }
 
+# Return a space-separated string of online CPU IDs, based on
+# /sys/devices/system/cpu/online, or from 0 to nproc - 1 otherwise.
+function get_online_cpus()
+{
+       local cpus=()
+       local range_re
+       if [ -f /sys/devices/system/cpu/online ]; then
+               range_re='([0-9]+)-([0-9]+)'
+               while read -r range ; do
+                       if [[ "${range}" =~ ${range_re} ]] ; then
+                               mapfile -t -O "${#cpus[*]}" cpus <<< $(seq "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}")
+                       else
+                               cpus+=("${range}")
+                       fi
+               done < <(tr ',' $'\n' < /sys/devices/system/cpu/online)
+       else
+               read -r -a cpus <<< $(seq 0 $(( $(conf_proc_count) - 1 )) )
+       fi
+       echo "${cpus[*]}"
+}
+
 # Helpers for get_possible_cpus.
 function get_possible_cpus_count_from_sysfs_possible_mask()
 {
@@ -286,8 +307,8 @@ function get_exposed_cpus_list()
 # value, e.g. that it could be 0.
 function get_any_available_cpu()
 {
-       for cpu in /sys/devices/system/cpu/cpu[0-9]*; do
-               echo "${cpu#/sys/devices/system/cpu/cpu}"
+       for cpu in $(get_online_cpus); do
+               echo "${cpu}"
                break;
        done
 }