etc: note Arch wiki gaming so I remember them in the future on Steam Deck

etc/sysctl.d/80-gamecompatibility.conf

@@ -0,0 +1,2 @@
+# wiki.archlinux.org/title/Gaming#Increase_vm.max_map_count
+vm.max_map_count = 2147483642

etc/tmpfiles.d/.gitignore

@@ -0,0 +1,2 @@
+# Generated by a script containing UIDs, so not useful here.
+btrfs-enable-dynamic-periodic-reclaim.conf

etc/tmpfiles.d/consistent-response-time-for-gaming.conf

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+# https://wiki.archlinux.org/title/Gaming#Make_the_changes_permanent
+#    Path                  Mode UID  GID  Age Argument
+w /proc/sys/vm/compaction_proactiveness - - - - 0
+w /proc/sys/vm/watermark_boost_factor - - - - 1
+w /proc/sys/vm/min_free_kbytes - - - - 1048576
+w /proc/sys/vm/watermark_scale_factor - - - - 500
+w /proc/sys/vm/swappiness - - - - 10
+w /sys/kernel/mm/lru_gen/enabled - - - - 5
+w /proc/sys/vm/zone_reclaim_mode - - - - 0
+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
+w /proc/sys/vm/page_lock_unfairness - - - - 1
+w /proc/sys/kernel/sched_child_runs_first - - - - 0
+w /proc/sys/kernel/sched_autogroup_enabled - - - - 1
+w /proc/sys/kernel/sched_cfs_bandwidth_slice_us - - - - 3000
+w /sys/kernel/debug/sched/base_slice_ns  - - - - 3000000
+w /sys/kernel/debug/sched/migration_cost_ns - - - - 500000
+w /sys/kernel/debug/sched/nr_migrate - - - - 8
+