Migrate for throughput

Signed-off-by: tytydraco <tylernij@gmail.com>

ktweak

@@ -1,14 +1,17 @@
 #!/usr/bin/env bash
 # Written by Draco (tytydraco @ GitHub)
 
+# The name of the current branch for logging purposes
+BRANCH="throughput"
+
 # Maximum unsigned integer size in C
 UINT_MAX="4294967295"
 
 # Duration in nanoseconds of one scheduling period
-SCHED_PERIOD="$((1 * 1000 * 1000))"
+SCHED_PERIOD="$((10 * 1000 * 1000))"
 
 # How many tasks should we have at a maximum in one scheduling period
-SCHED_TASKS="8"
+SCHED_TASKS="6"
 
 write() {
 	# Bail out if file does not exist
@@ -40,19 +43,19 @@ grep -q android /proc/cmdline && ANDROID=true
 
 # Log the date and time for records sake
 echo "Time of execution: $(date)"
-echo "Branch: dev"
+echo "Branch: $BRANCH"
 
 # Sync to data in the rare case a device crashes
 sync
 
 # Limit max perf event processing time to this much CPU usage
-write /proc/sys/kernel/perf_cpu_time_max_percent 5
+write /proc/sys/kernel/perf_cpu_time_max_percent 20
 
-# Group tasks for less stutter but less throughput
-write /proc/sys/kernel/sched_autogroup_enabled 1
+# Sacrifice latency for throughput when grouping tasks
+write /proc/sys/kernel/sched_autogroup_enabled 0
 
-# Execute child process before parent after fork
-write /proc/sys/kernel/sched_child_runs_first 1
+# Process child-parent forks naturally
+write /proc/sys/kernel/sched_child_runs_first 0
 
 # Preliminary requirement for the following values
 write /proc/sys/kernel/sched_tunable_scaling 0
@@ -73,7 +76,7 @@ write /proc/sys/kernel/sched_migration_cost_ns 5000000
 [[ "$ANDROID" == true ]] && write /proc/sys/kernel/sched_min_task_util_for_colocation 0
 
 # Improve real time latencies by reducing the scheduler migration time
-write /proc/sys/kernel/sched_nr_migrate 8
+write /proc/sys/kernel/sched_nr_migrate 128
 
 # Disable scheduler statistics to reduce overhead
 write /proc/sys/kernel/sched_schedstats 0
@@ -82,7 +85,7 @@ write /proc/sys/kernel/sched_schedstats 0
 write /proc/sys/kernel/printk_devkmsg off
 
 # Start non-blocking writeback later
-write /proc/sys/vm/dirty_background_ratio 10
+write /proc/sys/vm/dirty_background_ratio 15
 
 # Start blocking writeback later
 write /proc/sys/vm/dirty_ratio 30
@@ -102,8 +105,8 @@ write /proc/sys/vm/stat_interval 10
 # Swap to the swap device at a fair rate
 write /proc/sys/vm/swappiness 100
 
-# Prioritize page cache over simple file structure nodes
-write /proc/sys/vm/vfs_cache_pressure 200
+# Allow inodes and dentries to build up a larger cache
+write /proc/sys/vm/vfs_cache_pressure 80
 
 # Enable Explicit Congestion Control
 write /proc/sys/net/ipv4/tcp_ecn 1
@@ -125,8 +128,8 @@ fi
 
 [[ "$ANDROID" == true ]] && if [[ -d "/dev/stune/" ]]
 then
-	# Prefer to schedule top-app tasks on idle CPUs
-	write /dev/stune/top-app/schedtune.prefer_idle 1
+	# We are not concerned with prioritizing latency
+	write /dev/stune/top-app/schedtune.prefer_idle 0
 
 	# Mark top-app as boosted, find high-performing CPUs
 	write /dev/stune/top-app/schedtune.boost 1
@@ -159,7 +162,7 @@ do
 	write "$governor/rate_limit_us" "$((SCHED_PERIOD / 1000))"
 
 	# Jump to hispeed frequency at this load percentage
-	write "$governor/hispeed_load" 90
+	write "$governor/hispeed_load" 85
 	write "$governor/hispeed_freq" "$UINT_MAX"
 done
 
@@ -171,7 +174,7 @@ do
 	write "$governor/min_sample_time" "$((SCHED_PERIOD / 1000))"
 
 	# Jump to hispeed frequency at this load percentage
-	write "$governor/go_hispeed_load" 90
+	write "$governor/go_hispeed_load" 85
 	write "$governor/hispeed_freq" "$UINT_MAX"
 done
 
@@ -194,11 +197,11 @@ do
 	# Disable I/O statistics accounting
 	write "$queue/iostats" 0
 
-	# Reduce heuristic read-ahead in exchange for I/O latency
-	write "$queue/read_ahead_kb" 128
+	# Sacrifice I/O and memory efficiency for a possible throughput gain
+	write "$queue/read_ahead_kb" 256
 
-	# Reduce the maximum number of I/O requests in exchange for latency
-	write "$queue/nr_requests" 64
+	# Buffer more requests at once
+	write "$queue/nr_requests" 512
 done
 
 # Always return success, even if the last write fails