commit 0f1811415f16ea315ab27900c692a7851f018600
author Wei Wang <wvw@google.com> Thu Jul 26 13:47:13 2018 -0700
committer Wei Wang <wvw@google.com> Fri Jul 27 16:35:36 2018 +0000
tree 616990508f178019e9a6503b1ffeb97c96621c8b
parent 51b2160f2bfb122f08c37bc02609a1f55a575873

Set runtime readahead to 128KiB

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

Bug: 110908295
Bug: 111855179
Test: Boot
Change-Id: I449d2733bc836ed7661653efb2400fc031a76644
(cherry picked from commit bed30a438faf4e9c4eabc51edf86ef1a97d00385)

init-common.rc

diff --git a/init-common.rc b/init-common.rc
index 356c9d8..0dcc3f0 100644
--- a/init-common.rc
+++ b/init-common.rc
@@ -10,11 +10,11 @@
 
 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/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 property:sys.boot_completed=1 && property:ro.build.type=user
     write /proc/sys/kernel/modules_disabled 1