X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=tests%2Futils%2Futils.sh;h=9ffcc6ff29e072c03bf1571ec10036126f6f9c42;hb=2a05e025c52eda43f8ebafdbe6f47dc0e80efa77;hp=ea354cf62fc4236f4201e834e0353d0317eb1210;hpb=c29d17cd2d85f6ee89037377cc33821829529867;p=lttng-tools.git

diff --git a/tests/utils/utils.sh b/tests/utils/utils.sh
index ea354cf62..9ffcc6ff2 100644
--- a/tests/utils/utils.sh
+++ b/tests/utils/utils.sh
@@ -214,6 +214,84 @@ function randstring()
 	echo
 }
 
+# Helpers for get_possible_cpus.
+function get_possible_cpus_count_from_sysfs_possible_mask()
+{
+	local max_possible_cpu_id
+
+	# The Awk script extracts the highest CPU id from the possible CPU
+	# mask. Assuming a numerical order, a field separator '-' and a record
+	# separator ','. The last value parsed is the highest id.
+	if [ -f /sys/devices/system/cpu/possible ]; then
+		max_possible_cpu_id=$(awk -F '-' 'BEGIN { RS = ","} { last = $NF } END { printf("%d\n", last) }' \
+				      /sys/devices/system/cpu/possible)
+		echo "$((max_possible_cpu_id+1))"
+	else
+		echo "0"
+	fi
+}
+
+# This is a fallback if the possible CPU mask is not available. This will not
+# take into account unplugged CPUs.
+function get_max_cpus_count_from_sysfs_cpu_directories()
+{
+	local max_possible_cpu_id=0
+	local current_cpu_id
+
+	for i in /sys/devices/system/cpu/cpu[0-9]*; do
+		current_cpu_id="${i#/sys/devices/system/cpu/cpu}"
+		if [ "$current_cpu_id" -gt "$max_possible_cpu_id" ]; then
+			max_possible_cpu_id="$current_cpu_id"
+		fi
+	done
+
+	echo "$((max_possible_cpu_id+1))"
+}
+
+# Return the number of possible CPUs.
+function get_possible_cpus_count()
+{
+	local possible_cpus_count
+	possible_cpus_count=$(get_possible_cpus_count_from_sysfs_possible_mask)
+
+	if [ "$possible_cpus_count" -eq "0" ]; then
+		local configured_cpus_count
+		configured_cpus_count=$(getconf _NPROCESSORS_CONF)
+		possible_cpus_count=$(get_max_cpus_count_from_sysfs_cpu_directories)
+		possible_cpus_count=$((configured_cpus_count > possible_cpus_count \
+							     ? configured_cpus_count \
+							     : possible_cpus_count))
+	fi
+
+	echo "$possible_cpus_count"
+}
+
+# Return the list of exposed CPU.
+#
+# NOTE! Use it like so:
+#
+# IFS=" " read -r -a VARIABLE <<< "$(get_exposed_cpus_list)"
+function get_exposed_cpus_list()
+{
+	local list=()
+
+	for i in /sys/devices/system/cpu/cpu[0-9]*; do
+		list+=("${i#/sys/devices/system/cpu/cpu}")
+	done
+
+	echo "${list[@]}"
+}
+
+# Return any available CPU found. Do not make assumption about the returned
+# 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}"
+		break;
+	done
+}
+
 # Return the number of _configured_ CPUs.
 function conf_proc_count()
 {