feat: add gaming performance tweaks

sysctl.d/99-gaming-perf.conf

@@ -0,0 +1,8 @@
+# https://wiki.archlinux.org/title/Gaming#Improving_performance
+vm.compaction_proactiveness = 0
+vm.watermark_boost_factor = 1
+vm.min_free_kbytes = 1048576
+vm.watermark_scale_factor = 500
+vm.swappiness = 10
+vm.zone_reclaim_mode = 0
+vm.page_lock_unfairness = 1

tmpfiles.d/99-gaming-perf.conf

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+# https://wiki.archlinux.org/title/Gaming#Improving_performance
+#   Path                                                Mode    UID GID Age Argument
+w   /sys/kernel/mm/lru_gen/enabled                      -       -   -   -   5
+w   /sys/kernel/mm/transparent_hugepage/enabled         -       -   -   -   madvise
+w   /sys/kernel/mm/transparent_hugepage/shmem_enabled   -       -   -   -   advise
+w   /sys/kernel/mm/transparent_hugepage/defrag          -       -   -   -   never