add swappiness and cache pressure

Dockerfile

@@ -122,6 +122,7 @@ FROM builder2 AS builder3
 
 # Install VirtualBox
 RUN rpm-ostree install VirtualBox
+COPY etc etc
 
 # Clear cache, /var and /tmp and commit ostree
 RUN rm -rf /tmp/* /var/* && mkdir -p /var/tmp && chmod -R 1777 /var/tmp && \

etc/sysctl.d/10-swappiness.conf

@@ -0,0 +1,3 @@
+#vm.swappiness=0
+#firefox crash fix test
+vm.swappiness=1

etc/sysctl.d/20-cache_pressure.conf

@@ -0,0 +1,3 @@
+vm.vfs_cache_pressure=50
+
+vm.min_free_kbytes=212000