commit 38025d96636472bc6a4543d95d5de0b0daffbe9d
author Wei Wang <wvw@google.com> Thu Jul 26 10:57:30 2018 -0700
committer Wei Wang <wvw@google.com> Fri Jul 27 16:35:03 2018 +0000
tree 5eca3688c42435f282cfd914f3806fef584c1733
parent 9f0ab139dbc97bfd78c220eb90cc7f9c7f556ea3

Set runtime readahead to 128KiB

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

Bug: 110908295
Bug: 111855179
Test: Boot
Change-Id: I42764950301ed737f7f5b071970c3cbdc296f7cd
(cherry picked from commit cb6cfebdca29b110bb9f4e6baf6e3cffdab2208e)

init.common.rc

diff --git a/init.common.rc b/init.common.rc
index 4d60550..eca55fa 100644
--- a/init.common.rc
+++ b/init.common.rc
@@ -813,7 +813,7 @@
     write /dev/cpuset/application/cpus 1,3
 
     # end boot time fs tune
-    write /sys/block/sda/queue/read_ahead_kb 512
+    write /sys/block/sda/queue/read_ahead_kb 128
     write /sys/block/sda/queue/nr_requests 128
     write /sys/block/dm-0/queue/read_ahead_kb 128
     write /sys/block/dm-1/queue/read_ahead_kb 128