sdcard_image-rpi.bbclass: Add sysctl.d config to set vm.min_free_kbytes to 8192

[GITHUB #49]

Signed-off-by: Sander van Grieken <sander@outrightsolutions.nl>
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>

1 files changed, 14 insertions, 0 deletions

diff --git a/classes/sdcard_image-rpi.bbclass b/classes/sdcard_image-rpi.bbclass
index 9bce5af..725355e 100644
--- a/classes/sdcard_image-rpi.bbclass
+++ b/classes/sdcard_image-rpi.bbclass
@@ -102,3 +102,17 @@ IMAGE_CMD_rpi-sdimg () {
                 dd if=${SDIMG_ROOTFS} of=${SDIMG} conv=notrunc seek=1 bs=${BOOT_SPACE} && sync && sync
         fi
 }
+
+ROOTFS_POSTPROCESS_COMMAND += " rpi_generate_sysctl_config ; "
+
+rpi_generate_sysctl_config() {
+        # systemd sysctl config
+        test -d ${IMAGE_ROOTFS}${sysconfdir}/sysctl.d && \
+                echo "vm.min_free_kbytes = 8192" > ${IMAGE_ROOTFS}${sysconfdir}/sysctl.d/rpi-vm.conf
+
+        # sysv sysctl config
+        IMAGE_SYSCTL_CONF="${IMAGE_ROOTFS}${sysconfdir}/sysctl.conf"
+        test -e ${IMAGE_ROOTFS}${sysconfdir}/sysctl.conf && \
+                sed -e "/vm.min_free_kbytes/d" -i ${IMAGE_SYSCTL_CONF}
+        echo "" >> ${IMAGE_SYSCTL_CONF} && echo "vm.min_free_kbytes = 8192" >> ${IMAGE_SYSCTL_CONF}
+}