commit d787af0b2abe54007bc98b539cf1ab2bacd8db13
author Wei Wang <wvw@google.com> Thu Jul 26 13:45:10 2018 -0700
committer Wei Wang <wvw@google.com> Thu Jul 26 21:16:06 2018 +0000
tree c546bee2335e2147bdb2508c542d1df1399d521a
parent 2db38acecd515d7cf8dd2787849bc61d7d9c1efd

Set runtime readahead to 128KiB

Reduce readahead to 128KiB to reduce thrashing under memory pressure.

Bug: 110908295
Bug: 111855179
Test: Boot
Change-Id: Id46cf3675d27355e3cb494086d4d06923fe0989d

init-taimen.rc

diff --git a/init-taimen.rc b/init-taimen.rc
index 14c5fc0..e80d49f 100644
--- a/init-taimen.rc
+++ b/init-taimen.rc
@@ -15,14 +15,14 @@
 
 on property:sys.boot_completed=1
     # end boot time fs tune
-    write /sys/block/sda/queue/read_ahead_kb 1024
+    write /sys/block/sda/queue/read_ahead_kb 128
     write /sys/block/sda/queue/nr_requests 128
     write /sys/block/sda/queue/iostats 1
-    write /sys/block/sde/queue/read_ahead_kb 1024
+    write /sys/block/sde/queue/read_ahead_kb 128
     write /sys/block/sde/queue/nr_requests 128
     write /sys/block/sde/queue/iostats 1
-    write /sys/block/dm-0/queue/read_ahead_kb 512
-    write /sys/block/dm-1/queue/read_ahead_kb 512
+    write /sys/block/dm-0/queue/read_ahead_kb 128
+    write /sys/block/dm-1/queue/read_ahead_kb 128
 
 on boot
     # Allow ftm4 autotune from adb shell