[Draft] lvrt cgroupsv2: Add cgroups v2 file hierarchy specific to LVRT usage

recipes-ni/cgroups-v2/files/cgroupv2-common.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+# Common cgroup v2 paths
+CGROUP2_ROOT="/sys/fs/cgroup"
+NI_GROUP="${CGROUP2_ROOT}/ni"
+SUBGROUPS="irq scanengine system time-critical timed-structures"
+
+setup_mount_and_chown() {
+    if ! mountpoint -q "${CGROUP2_ROOT}"; then
+        mount -t cgroup2 none "${CGROUP2_ROOT}"
+    fi
+
+    cd "${CGROUP2_ROOT}"
+
+    echo "+cpuset" > cgroup.subtree_control
+
+    mkdir -p "${NI_GROUP}"
+    chown lvuser:ni "${NI_GROUP}"
+
+    cd "${NI_GROUP}"
+
+    echo "+cpuset" > cgroup.subtree_control
+
+    for group in $SUBGROUPS; do
+        mkdir -p "$group"
+        chown lvuser:ni "$group"
+    done
+
+    echo "Mount and chown setup done."
+}
+
+assign_tasks() {
+    if [ -f "../tasks" ]; then
+        while read TASK; do
+            echo "$TASK" > system/cgroup.procs 2>/dev/null || true
+        done < "../tasks"
+    fi
+}

recipes-ni/cgroups-v2/files/createcpuacctgroups

@@ -0,0 +1,21 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          createcpuacctgroups
+# Required-Start:    $local_fs
+# Default-Start:     2 3 4 5
+# Default-Stop:
+# Short-Description: Assign tasks for cpuacct groups
+### END INIT INFO
+
+set -e
+
+. /usr/lib/cgroupv2-common.sh
+
+setup_mount_and_chown
+
+cd "${NI_GROUP}"
+
+assign_tasks
+
+echo "createcpuacctgroups done."
+exit 0

recipes-ni/cgroups-v2/files/createcpusets

@@ -0,0 +1,30 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          createcpusets
+# Required-Start:    $local_fs
+# Default-Start:     2 3 4 5
+# Default-Stop:
+# Short-Description: Setup cpuset controller & assign tasks
+### END INIT INFO
+
+set -e
+
+. /usr/lib/cgroupv2-common.sh
+
+setup_mount_and_chown
+
+cd "${NI_GROUP}"
+
+for group in $SUBGROUPS; do
+    if [ -f "../cpuset.cpus" ]; then
+        cat ../cpuset.cpus > "$group/cpuset.cpus"
+    fi
+    if [ -f "../cpuset.mems" ]; then
+        cat ../cpuset.mems > "$group/cpuset.mems"
+    fi
+done
+
+assign_tasks
+
+echo "createcpusets done."
+exit 0

recipes-ni/cgroups-v2/nicreatecgroupsv2_1.0.bb

@@ -0,0 +1,55 @@
+SUMMARY = "NI cgroup v2 setup (mount/chown, cpusets, cpuacctgroups)"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+SRC_URI = "file://cgroupv2-common.sh \
+           file://createcpusets \
+           file://createcpuacctgroups"
+
+S = "${WORKDIR}"
+
+inherit update-rc.d
+
+INITSCRIPT_PACKAGES = "${PN}-cpusets ${PN}-cpuacct"
+
+INITSCRIPT_NAME:${PN}-cpusets = "createcpusets"
+INITSCRIPT_PARAMS:${PN}-cpusets = "start 01 1 4 5 . stop 99 0 6 ."
+
+INITSCRIPT_NAME:${PN}-cpuacct = "createcpuacctgroups"
+INITSCRIPT_PARAMS:${PN}-cpuacct = "start 02 2 4 5 . stop 99 0 6 ."
+
+FILES:${PN} = "/usr/lib/cgroupv2-common.sh \
+               ${sysconfdir}/init.d/createcpusets \
+               ${sysconfdir}/init.d/createcpuacctgroups"
+
+RDEPENDS_${PN} += "update-rc.d"
+
+do_install () {
+    # Install the common helper script in /usr/lib
+    install -Dm755 ${WORKDIR}/cgroupv2-common.sh ${D}/usr/lib/cgroupv2-common.sh
+
+    # Install SysVinit scripts in /etc/init.d/
+    install -Dm755 ${WORKDIR}/createcpusets ${D}${sysconfdir}/init.d/createcpusets
+    install -Dm755 ${WORKDIR}/createcpuacctgroups ${D}${sysconfdir}/init.d/createcpuacctgroups
+}
+
+pkg_postinst:${PN} () {
+    if [ -x /usr/sbin/update-rc.d ]; then
+        update-rc.d createcpusets defaults
+    fi
+
+    if [ -x /usr/sbin/update-rc.d ]; then
+        update-rc.d createcpuacctgroups defaults
+    fi
+    exit 0
+}
+
+pkg_postrm:${PN} () {
+    if [ -x /usr/sbin/update-rc.d ]; then
+        update-rc.d -f createcpusets remove
+    fi
+    if [ -x /usr/sbin/update-rc.d ]; then
+        update-rc.d -f createcpuacctgroups remove
+    fi
+    exit 0
+}